iOS開發中那些容易被我們忽略的代碼，常用代碼集合

退回輸入鍵盤

- (BOOL) textFieldShouldReturn:(id)textField{ [textField resignFirstResponder];

}

CGRect

CGRect frame = CGRectMake (origin.x, origin.y, size.width, size.height);矩形 NSStringFromCGRect(someCG) 把 CGRect 結構轉變爲格式化字符串; CGRectFromString(aString) 由字符串恢復出矩形;

CGRectInset(aRect) 創建較小或較大的矩形(中心點相同),+較小 -較大 CGRectIntersectsRect(rect1, rect2) 判斷兩矩形是否交叉,是否重疊 CGRectZero 高度和寬度爲零的/位於(0,0)的矩形常量

CGPoint & CGSize

CGPoint aPoint = CGPointMake(x, y); CGSize aSize = CGSizeMake(width, height);

設置透明度

[myView setAlpha:value]; (0.0 < value < 1.0)

設置背景色

[myView setBackgroundColor:[UIColor redColor]];

(blackColor;darkGrayColor;lightGrayColor; whiteColor;grayColor; redColor; greenColor; blueColor; cyanColor;yellowColor; magentaColor;orangeColor;purpleColor; brownColor; clearColor; )

自定義顏色

UIColor *newColor = [[UIColor alloc]

initWithRed:(float) green:(float) blue:(float) alpha:(float)];

0.0~1.0

豎屏

320X480

橫屏

480X320

狀態欄高 (顯示時間和網絡狀態) 20 像素

導航欄、工具欄高(返回) 44 像素

隱藏狀態欄

[[UIApplication shareApplication] setStatusBarHidden: YES animated:NO]

橫屏

[[UIApplication shareApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight].

屏幕變動檢測

orientation == UIInterfaceOrientationLandscapeLeft

全屏

window=[[UIWindow alloc] initWithFrame:[UIScreen mainScreen] bounds];

自動適應父視圖大小:

aView.autoresizingSubviews = YES;

aView.autoresizingMask = (UIViewAutoresizingFlexibleWidth |

UIViewAutoresizingFlexibleHeight);

定義按鈕

UIButton *scaleUpButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [scaleUpButton setTitle:@"放大" forState:UIControlStateNormal]; scaleUpButton.frame = CGRectMake(40, 420, 100, 40);

[scaleUpButton addTarget:self

action:@selector(scaleUp) forControlEvents:UIControlEventTouchUpInside];

設置視圖背景圖片

UIImageView *aView;

[aView setImage:[UIImage imageNamed:@”name.png”]]; view1.backgroundColor = [UIColor colorWithPatternImage: [UIImage imageNamed:@"image1.png"]];

活動表單

- (IBActive) someButtonPressed:(id) sender {

UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@”Are you sure?”

delegate:self

cancelButtonTitle:@”No way!” destructiveButtonTitle:@”Yes, I’m Sure!” otherButtonTitles:nil];

[actionSheet showInView:self.view];

[actionSheet release]; }

警告視圖

- (void) actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex

{

if(buttonIndex != [actionSheet cancelButtonIndex]) {

NSString *message = [[NSString alloc] initWithFormat:@”You can breathe easy, everything went OK.”];

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@”Something was done”

[alert show]; [alert release]; [message release];

}

動畫效果

-(void)doChange:(id)sender {

if(view2 == nil)

{

[self loadSec];

}

[UIView beginAnimations:nil context:NULL];

[UIView setAnimationDuration:1];

[UIView setAnimationTransition:([view1 superview]?UIViewAnimationTransitionFlipFromLeft:UIViewAnimationTransitionFlipFromRigh t)forView:self.view cache:YES];

if([view1 superview]!= nil) {

[view1 removeFromSuperview]; [self.view addSubview:view2];

}else {

[view2 removeFromSuperview]; [self.view addSubview:view1]; }

[UIView commitAnimations];

}

Table View <UITableViewDateSource> #pragma mark -

#pragma mark Table View Data Source Methods //指定分區中的行數,默認爲 1

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

return [self.listData count]; }

設置每一行 cell 顯示的內容

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

static NSString *SimpleTableIndentifier = @"SimpleTableIndentifier"; UITableViewCell *cell = dequeueReusableCellWithIdentifier:SimpleTableIndentifier];

if (cell == nil) {

cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:SimpleTableIndentifier]

autorelease];

}

UIImage *image = [UIImage imageNamed:@"13.gif"]; cell.imageView.image = image;

[tableView

NSUInteger row = [indexPath row]; cell.textLabel.text = [listData objectAtIndex:row];

cell.textLabel.font = [UIFont boldSystemFontOfSize:20];

if(row < 5)

cell.detailTextLabel.text = @"Best friends"; else

cell.detailTextLabel.text = @"friends"; return cell;

}

判斷郵箱格式是否正確的代碼

利用正則表達式驗證

-(BOOL)isValidateEmail:(NSString *)email

{

NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES%@",emailRegex];

return [emailTest evaluateWithObject:email];

}

圖片壓縮

用法：UIImage *yourImage= [self imageWithImageSimple:image scaledToSize:CGSizeMake(210.0, 210.0)];

壓縮圖片

- (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize

{

Create a graphics image context

UIGraphicsBeginImageContext(newSize);

Tell the old image to draw in this newcontext, with the desired

new size

[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];

Get the new image from the context

UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();

End the context

UIGraphicsEndImageContext();

Return the new image.

return newImage;

}

親測可用的圖片上傳代碼

- (IBAction)uploadButton:(id)sender {

UIImage *image = [UIImage imageNamed:@"1.jpg"]; 圖片名

NSData *imageData = UIImageJPEGRepresentation(image,0.5);壓縮比例

NSLog(@"字節數:%i",[imageData length]);

post url

NSString *urlString = @"http://192.168.1.113:8090/text/UploadServlet";

服務器地址

setting up the request object now

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;

[request setURL:[NSURL URLWithString:urlString]];

[request setHTTPMethod:@"POST"];

NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];

NSString *contentType = [NSString stringWithFormat:@"multipart/form-data;boundary=%@",boundary];

[request addValue:contentType forHTTPHeaderField: @"Content-Type"];

NSMutableData *body = [NSMutableData data];

[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[[NSString stringWithString:@"Content-Disposition:form-data; name=\"userfile\"; filename=\"2.png\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 上傳上去的圖片名字

[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[NSData dataWithData:imageData]];

[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];

[request setHTTPBody:body];

NSLog(@"1-body:%@",body);

NSLog(@"2-request:%@",request);

NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

NSLog(@"3-測試輸出：%@",returnString);

給imageView加載圖片

UIImage *myImage = [UIImage imageNamed:@"1.jpg"];

[imageView setImage:myImage];

[self.view addSubview:imageView];

對圖庫的操作

選擇相冊：

UIImagePickerControllerSourceTypesourceType=UIImagePickerControllerSourceTypeCamera;

if (![UIImagePickerControllerisSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

sourceType=UIImagePickerControllerSourceTypePhotoLibrary;

}

UIImagePickerController * picker = [[UIImagePickerControlleralloc]init];

picker.delegate = self;

picker.allowsEditing=YES;

picker.sourceType=sourceType;

[self presentModalViewController:picker animated:YES];

選擇完畢：

-(void)imagePickerController:(UIImagePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary *)info

{

[picker dismissModalViewControllerAnimated:YES];

UIImage * image=[info objectForKey:UIImagePickerControllerEditedImage];

[self performSelector:@selector(selectPic:) withObject:imageafterDelay:0.1];

}

-(void)selectPic:(UIImage*)image

{

NSLog(@"image%@",image);

imageView = [[UIImageView alloc] initWithImage:image];

imageView.frame = CGRectMake(0, 0, image.size.width, image.size.height);

[self.viewaddSubview:imageView];

[self performSelectorInBackground:@selector(detect:) withObject:nil];

}

detect爲自己定義的方法，編輯選取照片後要實現的效果

取消選擇：

-(void)imagePickerControllerDIdCancel:(UIImagePickerController*)picker

{

[picker dismissModalViewControllerAnimated:YES];

}

跳到下個View

nextWebView = [[WEBViewController alloc] initWithNibName:@"WEBViewController" bundle:nil];

[self presentModalViewController:nextWebView animated:YES];

創建一個UIBarButtonItem右邊按鈕

UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"右邊" style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)];

[self.navigationItem setRightBarButtonItem:rightButton];

設置navigationBar隱藏

self.navigationController.navigationBarHidden = YES;

iOS開發之UIlabel多行文字自動換行（自動折行）

UIView *footerView = [[UIView alloc]initWithFrame:CGRectMake(10, 100, 300, 180)];

UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(10, 100, 300, 150)];

label.text = @"Hello world! Hello world!Hello world! Hello world! Hello world! Hello world! !";

背景顏色爲紅色

label.backgroundColor = [UIColor redColor];

設置字體顏色爲白色

label.textColor = [UIColor whiteColor];

文字居中顯示

label.textAlignment = UITextAlignmentCenter;

自動折行設置

label.lineBreakMode = UILineBreakModeWordWrap;

label.numberOfLines = 0;

代碼生成button

CGRect frame = CGRectMake(0, 400, 72.0, 37.0);

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

button.frame = frame;

[button setTitle:@"新添加的按鈕" forState: UIControlStateNormal];

button.backgroundColor = [UIColor clearColor];

button.tag = 2000;

[button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:button];

讓某個控件在View的中心位置顯示

（某個控件，比如label，View）label.center = self.view.center;

好看的文字處理

以tableView中cell的textLabel爲例子：

cell.backgroundColor = [UIColorscrollViewTexturedBackgroundColor];

設置文字的字體

cell.textLabel.font = [UIFont fontWithName:@"AmericanTypewriter" size:100.0f];

設置文字的顏色

cell.textLabel.textColor = [UIColor orangeColor];

設置文字的背景顏色

cell.textLabel.shadowColor = [UIColor whiteColor];

設置文字的顯示位置

cell.textLabel.textAlignment = UITextAlignmentCenter;

隱藏Status Bar

讀者可能知道一個簡易的方法,那就是在程序的viewDidLoad中加入

[[UIApplication sharedApplication]setStatusBarHidden:YES animated:NO];

更改AlertView背景

UIAlertView *theAlert = [[[UIAlertViewalloc] initWithTitle:@"Atention"

message: @"I'm a Chinese!"

delegate:nil

cancelButtonTitle:@"Cancel"

otherButtonTitles:@"Okay",nil] autorelease];

[theAlert show];

UIImage *theImage = [UIImageimageNamed:@"loveChina.png"];

theImage = [theImage stretchableImageWithLeftCapWidth:0topCapHeight:0];

CGSize theSize = [theAlert frame].size;

UIGraphicsBeginImageContext(theSize);

[theImage drawInRect:CGRectMake(5, 5, theSize.width-10, theSize.height-20)];這個地方的大小要自己調

整，以適應alertview的背景顏色的大小。

theImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

theAlert.layer.contents = (id)[theImage CGImage];

鍵盤透明

textField.keyboardAppearance = UIKeyboardAppearanceAlert;

狀態欄的網絡活動風火輪是否旋轉

[UIApplication sharedApplication].networkActivityIndicatorVisible，默認值是NO。

截取屏幕圖片

創建一個基於位圖的圖形上下文並指定大小爲CGSizeMake(200,400)

UIGraphicsBeginImageContext(CGSizeMake(200,400));

renderInContext 呈現接受者及其子範圍到指定的上下文

[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

返回一個基於當前圖形上下文的圖片

UIImage *aImage = UIGraphicsGetImageFromCurrentImageContext();

移除棧頂的基於當前位圖的圖形上下文

UIGraphicsEndImageContext();

以png格式返回指定圖片的數據

imageData = UIImagePNGRepresentation(aImage);

更改cell選中的背景

UIView *myview = [[UIView alloc] init];

myview.frame = CGRectMake(0, 0, 320, 47);

myview.backgroundColor = [UIColorcolorWithPatternImage:[UIImage imageNamed:@"0006.png"]];

cell.selectedBackgroundView = myview;

顯示圖像

CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0f, 109.0f);

UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect];

[myImage setImage:[UIImage imageNamed:@"myImage.png"]];

myImage.opaque = YES; opaque是否透明

[self.view addSubview:myImage];

能讓圖片適應框的大小（待確認）

NSString*imagePath = [[NSBundle mainBundle] pathForResource:@"XcodeCrash"ofType:@"png"];

UIImage *image = [[UIImage alloc]initWithContentsOfFile:imagePath];

UIImage *newImage= [image transformWidth:80.f height:240.f];

UIImageView *imageView = [[UIImageView alloc]initWithImage:newImage];

[newImagerelease];

[image release];

[self.view addSubview:imageView];

實現點擊圖片進行跳轉的代碼：生成一個帶有背景圖片的button，給button綁定想要的事件！

UIButton *imgButton=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 120, 120)];

[imgButton setBackgroundImage:(UIImage *)[self.imgArray objectAtIndex:indexPath.row] forState:UIControlStateNormal];

imgButton.tag=[indexPath row];

[imgButton addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];

多線程和結束後的更新UI操作

dispatch_async(dispatch_get_global_queue(0, 0), ^{

耗時操作

dispatch_async(dispatch_get_main_queue(), ^{

更新UI操作

});

修改PlaceHolder的默認顏色

[username_text setValue:[UIColor colorWithRed:1 green:1 blue:1 alpha:0.5] forKeyPath:@"_placeholderLabel.textColor"];

頁面上移解決文本框被鍵盤彈出擋住的問題

textfield的函數

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

[username_text resignFirstResponder];

[password_text resignFirstResponder];

When the user presses return, take focus away from the text field so that the keyboard is dismissed.

NSTimeInterval animationDuration = 0.30f;

[UIView beginAnimations:@"ResizeForKeyboard" context:nil];

[UIView setAnimationDuration:animationDuration];

CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);

self.view.frame = rect;

[UIView commitAnimations];

}

- (BOOL)textFieldShouldReturn:(UITextField *)textField

{

When the user presses return, take focus away from the text field so that the keyboard is dismissed.

NSTimeInterval animationDuration = 0.30f;

[UIView beginAnimations:@"ResizeForKeyboard" context:nil];

[UIView setAnimationDuration:animationDuration];

CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);

self.view.frame = rect;

[UIView commitAnimations];

[textField resignFirstResponder];

return YES;

}

- (void)textFieldDidBeginEditing:(UITextField *)textField

{

CGRect frame = password_text.frame;

int offset = frame.origin.y + 32 - (self.view.frame.size.height - 216.0);//鍵盤高度216

NSTimeInterval animationDuration = 0.30f;

[UIView beginAnimations:@"ResizeForKeyBoard" context:nil];

[UIView setAnimationDuration:animationDuration];

float width = self.view.frame.size.width;

float height = self.view.frame.size.height;

if(offset > 0)

{

CGRect rect = CGRectMake(0.0f, -offset,width,height);

self.view.frame = rect;

}

[UIView commitAnimations];

}

iOS代碼加密常用加密方式，常見的iOS代碼加密常用加密方式算法包括MD5加密、AES加密、BASE64加密：

MD5 iOS代碼加密

創建MD5類，代碼如下

#import <Foundation/Foundation.h>

@interface CJMD5 : NSObject

+(NSString *)md5HexDigest:(NSString *)input;

@end

#import "CJMD5.h"

#import <CommonCrypto/CommonDigest.h>

@implementation CJMD5

+(NSString *)md5HexDigest:(NSString *)input{

const char* str = [input UTF8String];

unsigned char result[CC_MD5_DIGEST_LENGTH];

CC_MD5(str, strlen(str), result);

NSMutableString *ret = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH];

for(int i = 0; i<CC_MD5_DIGEST_LENGTH; i++) {

[ret appendFormat:@"%02X",result];

}

return ret;

}

@end

MD5是不可逆的只有加密沒有解密，iOS代碼加密使用方式如下

NSString *userName = @"cerastes";

NSString *password = @"hello Word";

MD5加密

NSString *md5 = [CJMD5 md5HexDigest:password];

NSLog(@"%@",md5);

END

AES加密iOS代碼加密

AES加密iOS代碼加密使用方法

AES加密

NSString *encryptedData = [AESCrypt encrypt:userName password:password];加密

NSString *message = [AESCrypt decrypt:encryptedData password:password]; 解密

NSLog(@"加密結果 = %@",encryptedData);

NSLog(@"解密結果 = %@",message);

END

BASE64加密iOS代碼加密

BASE64加密iOS代碼加密添加如下方法

+ (NSString*)encodeBase64String:(NSString *)input;

+ (NSString*)decodeBase64String:(NSString *)input;

+ (NSString*)encodeBase64Data:(NSData *)data;

+ (NSString*)decodeBase64Data:(NSData *)data;

+ (NSString*)encodeBase64String:(NSString * )input {

NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];

data = [GTMBase64 encodeData:data];

NSString *base64String = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

return base64String;

}

+ (NSString*)decodeBase64String:(NSString * )input {

NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];

data = [GTMBase64 decodeData:data];

NSString *base64String = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

return base64String;

}

+ (NSString*)encodeBase64Data:(NSData *)data {

data = [GTMBase64 encodeData:data];

NSString *base64String = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

return base64String;

}

+ (NSString*)decodeBase64Data:(NSData *)data {

data = [GTMBase64 decodeData:data];

NSString *base64String = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

return base64String;

}

BASE64加密iOS代碼加密使用方法

BASE64加密

NSString *baseEncodeString = [GTMBase64 encodeBase64String:password];

NSString *baseDecodeString = [GTMBase64 decodeBase64String:baseEncodeString];

NSLog(@"baseEncodeString = %@",baseEncodeString);

NSLog(@"baseDecodeString = %@",baseDecodeString);

RSA加密：

RSA是目前最有影響力的公鑰加密算法，它能夠抵抗到目前爲止已知的絕大多數密碼攻擊，已被ISO推薦爲公鑰數據加密標準。

RSA公開密鑰密碼體制。所謂的公開密鑰密碼體制就是使用不同的加密密鑰與解密密鑰，是一種“由已知加密密鑰推導出解密密鑰在計算上是不可行的”密碼體制。

通常是先生成一對RSA 密鑰，其中之一是保密密鑰，由用戶保存；另一個爲公開密鑰，可對外公開，甚至可在網絡服務器中註冊。爲提高保密強度，RSA密鑰至少爲500位長，一般推薦使用1024位。這就使加密的計算量很大。爲減少計算量，在傳送信息時，常採用傳統加密方法與公開密鑰加密方法相結合的方式，即信息採用改進的DES或IDEA對話密鑰加密，然後使用RSA密鑰加密對話密鑰和信息摘要。對方收到信息後，用不同的密鑰解密並可覈對信息摘要。

RSA算法是第一個能同時用於加密和數字簽名的算法，也易於理解和操作。RSA是被研究得最廣泛的公鑰算法.

RSA算法是一種非對稱密碼算法，所謂非對稱，就是指該算法需要一對密鑰，使用其中一個加密，則需要用另一個才能解密。

RSA的算法涉及三個參數，n、e1、e2。

其中，n是兩個大質數p、q的積，n的二進制表示時所佔用的位數，就是所謂的密鑰長度。

e1和e2是一對相關的值，e1可以任意取，但要求e1與(p-1）*(q-1）互質；再選擇e2，要求（e2*e1）mod((p-1）*(q-1））=1。

（n，e1）,(n，e2）就是密鑰對。其中(n，e1）爲公鑰，(n，e2）爲私鑰。[1]

RSA加解密的算法完全相同，設A爲明文，B爲密文，則：A=B^e2 mod n；B=A^e1 mod n；（公鑰加密體制中，一般用公鑰加密，私鑰解密）

e1和e2可以互換使用，即：

A=B^e1 mod n；B=A^e2 mod n;

1）本地數據加密

對NSUserDefaults，sqlite存儲文件數據加密，保護帳號和關鍵信息。）URL編碼加密

對程序中出現的URL進行編碼加密，防止URL被靜態分析

2）網絡傳輸數據加密

對客戶端傳輸數據提供加密方案，有效防止通過網絡接口的攔截獲取

3）方法體，方法名高級混淆

對應用程序的方法名和方法體進行混淆，保證源碼被逆向後無法解析代碼

4）程序結構混排加密

對應用程序邏輯結構進行打亂混排，保證源碼可讀性降到最低

返回指定範圍的隨機數(m-n之間)的公式

Math.random()*(n-m)+m

防止被Iframe嵌套

if(top != self){

location.href = ”about:blank”;

}

/**

* HTTP GET 請求

**/

+(NSData *) doHttpGet:(NSString *)url

{

NSURL *uri = [NSURL URLWithString:url];

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:uri];

[request setHTTPMethod: @"GET" ];

NSData *returnData = [NSURLConnection sendSynchronousRequest: request returningResponse: nil error: nil];

return returnData;

}

/**

* HTTP POST請求

**/

+(NSData *) doHttpPost:(NSString *)url withString:(NSString *)param

{

NSData *data = nil;

if(param != nil && [param isEqualToString:@""] == NO){

param = [param stringByAddingPercentEscapesUsingEncoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];

data = [param dataUsingEncoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];

}

//調用withParam NSData*類型的方法.

return [self doHttpPost:url withParam:data];

}

/**

* HTTP POST請求

**/

+(NSData *) doHttpPost:(NSString *)url withParam:(NSData *)param

{

新建請求

NSURL *uri = [NSURL URLWithString:url];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:uri cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:40.0];

設置請求參數

[request setHTTPMethod:@"POST"];

[request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

if(param != nil)

[request setHTTPBody:param];

打開訪問網絡的狀態提示

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];

請求鏈接

NSError *error = nil;

NSData *retData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

NSLog(@"%d: %@", error.code, error.description);

關閉訪問網絡的狀態提示

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];

返回結果

return retData;

}

/**

* 獲取網絡圖片

**/

+(UIImage *) getImageFromUrl:(NSString *)url

{

if(url == nil || [url isEqualToString:@""]){

return nil;

}

url = StringByTrimWhiteSpace(url);

NSData *imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:url]];

UIImage *image =[[UIImage alloc] initWithData:imageData];

return image;

}

/**

* 獲取網絡圖片的內容

**/

+(NSData *)getImageDataFromUrl:(NSString *)url

{

if(url == nil || [url isEqualToString:@""]){

return nil;

}

NSData *imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:url]];

return imageData;

}

#pragma mark - 字符串處理

/**

* 利用正則表達示獲取字符串的匹配結果

**/

+(NSString *) getRegExpressResult:(NSString *)source regExp:(NSString *)regExp

{

NSString *temp = [NSString stringWithFormat:@"%@", source];

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regExp options:NSRegularExpressionCaseInsensitive error:nil];

if (regex != nil) {

NSTextCheckingResult *firstMatch = [regex firstMatchInString:temp options:0 range:NSMakeRange(0, [temp length])];

if (firstMatch) {

NSRange resultRange = [firstMatch rangeAtIndex:0];

截取數據

NSString *result = [temp substringWithRange:resultRange];

返回結果

return result;

}

return @"";

}

/**

* 匹配字符串中整個HTML標記的內容

**/

+(NSString *) getHtmlText:(NSString *)source tagName:(NSString *)tag

{

NSString *regexp = [NSString stringWithFormat:@"<\\s*%@\\s+([^>]*)\\s*>([^/%@>]*</%@>)?", tag, tag, tag];

return [BaseFunction getRegExpressResult:source regExp:regexp];

}

/**

* 匹配HTML標記內容中的屬性值

**/

+(NSString *) getHtmlTagAttr:(NSString *)tagContext attrName:(NSString *)attr

{

NSString *regexp = [NSString stringWithFormat: @"%@\\s*=\\s*?(['\"][^'\"]*?)['\"]", attr];

NSString *result = [BaseFunction getRegExpressResult:tagContext regExp:regexp];

替換

NSString *oldstr = [NSString stringWithFormat:@"%@=\"", attr];

NSString *newstr = [result stringByReplacingOccurrencesOfString:oldstr withString:@""];

newstr = [newstr substringToIndex:[newstr length] - 1];

return newstr;

}

/**

* 獲取HTML標記的文本

**/

+(NSString *) getHTmlTagText:(NSString *)tagContext

{

NSString *regExp = @"<\\s*\\w+\\s+([^>]*)\\s*>";

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regExp options:NSRegularExpressionCaseInsensitive error:nil];

NSTextCheckingResult *firstMatch = [regex firstMatchInString:tagContext options:0 range:NSMakeRange(0, [tagContext length])];

NSRange resultRange = [firstMatch rangeAtIndex:0];

NSString *newStr = [tagContext substringFromIndex:resultRange.length];

regExp = @"</\\w+\\s*>";

regex = [NSRegularExpression regularExpressionWithPattern:regExp options:NSRegularExpressionCaseInsensitive error:nil];

firstMatch = [regex firstMatchInString:newStr options:0 range:NSMakeRange(0, [newStr length])];

resultRange = [firstMatch rangeAtIndex:0];

return [newStr substringToIndex:resultRange.location];

}

/**

* 替換HTML標籤

**/

+(NSString *) replaceHtmlTag:(NSString *)source

{

source = [BaseFunction replaceString:source byRegexp:@"<[^>]+>"];

return [BaseFunction replaceString:source byRegexp:@"</[^>]+>"];

}

+(NSString *) replaceString:(NSString *)source byRegexp:(NSString *)exp

{

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:exp options:0 error:nil];

if(regex == nil)

return source;

NSString *ret = [NSString stringWithFormat:@"%@", source];

NSArray *array = [regex matchesInString:ret options:NSMatchingReportProgress range:NSMakeRange(0, [ret length])];

for(int i = (int)[array count] - 1; i >= 0; i--)

{

NSTextCheckingResult *tcr = [array objectAtIndex:i];

NSRange range = [tcr range];

ret = [ret stringByReplacingCharactersInRange:range withString:@""];

}

return ret;

}

/**

* 正則驗證

**/

+(BOOL) string:(NSString *)source MatchRegex:(NSString *) exp

{

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", exp];

return [predicate evaluateWithObject:source];

}

/**

* 獲取正則表達式中匹配的個數

**/

+ (NSInteger) getMatchCount:(NSString *)text inRegx:(NSString *)exp

{

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:exp options:0 error:nil];

int count = 0;

if (regex != nil) {

NSArray *array = [regex matchesInString:text options:NSMatchingReportProgress range:NSMakeRange(0, [text length])];

for(int i=0; i< [array count]; i++)

{

NSTextCheckingResult *tcr = [array objectAtIndex:i];

NSRange range = [tcr range];

count += range.length;

}

return count;

}

/**

* 替換XML敏感字符

**/

+ (NSString *) replaceXMLSensitiveLettler:(NSString *)text

{

NSString *tmp = [text stringByReplacingOccurrencesOfString:@"&" withString:@"&"];

tmp = [tmp stringByReplacingOccurrencesOfString:@"<" withString:@"<"];

tmp = [tmp stringByReplacingOccurrencesOfString:@">" withString:@">"];

return tmp;

}

/**

* 分離座標

**/

+(void) separateCoordinate:(NSString *)coord lat:(NSString **)lat lng:(NSString **)lng

{

*lng = @"", *lat = @"";

驗證數據的合法性

if(coord == nil){ return; }

coord = StringByTrimWhiteSpace(coord);

if(IsStringEmpty(coord)){

return;

}

將座標分開

NSArray *coordArray = [coord componentsSeparatedByString:@","];

if([coordArray count]>0)

*lng = [coordArray objectAtIndex:0];

if([coordArray count]>1)

*lat = [coordArray objectAtIndex:1];

}

/**

* 從文件路徑中分解出文件名

**/

+ (NSString *) splitFileNameForPath:(NSString *)filePath

{

NSArray *array = [filePath componentsSeparatedByString:@"/"];

return [array lastObject];

}

/**

* 從文件路徑中分解出文件的擴展名

**/

+ (NSString *) getFileExtension:(NSString *)filePath

{

NSString *fileName = [self splitFileNameForPath:filePath];

NSArray *array = [fileName componentsSeparatedByString:@"."];

return [NSString stringWithFormat:@".%@",[array lastObject]];

}

/**

* 獲取設備型號

**/

+ (NSString *) platform

{

size_t size;

sysctlbyname("hw.machine", NULL, &size, NULL, 0);

char *machine = (char *)malloc(size);

sysctlbyname("hw.machine", machine, &size, NULL, 0);

NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];

free(machine);

NSRange range = [platform rangeOfString:@","];

return [platform substringToIndex:range.location];

}

/**

* MD5加密

**/

+ (NSString *)md5Digest:(NSString *)str {

const char *cStr = [str UTF8String];

unsigned char result[CC_MD5_DIGEST_LENGTH];

CC_MD5(cStr, (CC_LONG)strlen(cStr), result); // This is the md5 call

NSMutableString *md5Result = [[NSMutableString alloc] init];

for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {

[md5Result appendFormat:@"%02x", result[i]];

}

return md5Result;

return [NSString stringWithFormat:

@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",

result[0], result[1], result[2], result[3],

result[4], result[5], result[6], result[7],

result[8], result[9], result[10], result[11],

result[12], result[13], result[14], result[15]];

}

+ (NSString *)SHA1:(NSString *)str {

const char *cStr = [str UTF8String];

NSData *data = [NSData dataWithBytes:cStr length:str.length];

uint8_t digest[CC_SHA1_DIGEST_LENGTH];

CC_SHA1(data.bytes, (CC_LONG)data.length, digest);

NSMutableString *result = [[NSMutableString alloc] init];

for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++) {

[result appendFormat:@"%02x", digest[i]];

}

return result;

}

判斷是否爲整形

+ (BOOL)isPureInt:(NSString *)string{

NSScanner* scan = [NSScanner scannerWithString:string];

int val;

return [scan scanInt:&val] && [scan isAtEnd];

}

判斷是否爲浮點形

+ (BOOL)isPureFloat:(NSString *)string{

NSScanner* scan = [NSScanner scannerWithString:string];

float val;

return [scan scanFloat:&val] && [scan isAtEnd];

}

/**

* 版本比較

**/

+ (BOOL)isVersion:(NSString*)versionA biggerThanVersion:(NSString*)versionB

{

NSArray *arrayNow = [versionB componentsSeparatedByString:@"."];

NSArray *arrayNew = [versionA componentsSeparatedByString:@"."];

BOOL isBigger = NO;

NSInteger i = arrayNew.count > arrayNow.count? arrayNow.count : arrayNew.count;

NSInteger j = 0;

BOOL hasResult = NO;

for (j = 0; j < i; j ++) {

NSString* strNew = [arrayNew objectAtIndex:j];

NSString* strNow = [arrayNow objectAtIndex:j];

if ([strNew integerValue] > [strNow integerValue]) {

hasResult = YES;

isBigger = YES;

break;

}

if ([strNew integerValue] < [strNow integerValue]) {

hasResult = YES;

isBigger = NO;

break;

}

if (!hasResult) {

if (arrayNew.count > arrayNow.count) {

NSInteger nTmp = 0;

NSInteger k = 0;

for (k = arrayNow.count; k < arrayNew.count; k++) {

nTmp += [[arrayNew objectAtIndex:k]integerValue];

}

if (nTmp > 0) {

isBigger = YES;

}

return isBigger;

}

Reveal使用

1. Build Settings 搜索Other

將Other Linker Flags設置爲 -ObjC

2. Reveal.framework拖到項目中即可

~/資源庫/Caches/

找到com.ittybittyapps.Reveal文件夾刪除

~/資源庫/Preferences/

找到com.ittybittyapps.Reveal.plist刪除

又可以使用30天

UILabel設置多種字體、顏色

NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"Using NSAttributed String，try your best to test attributed string text"];

[str addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(0,5)];

[str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(6,12)];

[str addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(19,6)];

[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Arial" size:30.0] range:NSMakeRange(0, 5)];

[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Arial" size:30.0] range:NSMakeRange(6, 12)];

[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Arial" size:30.0] range:NSMakeRange(19, 6)];

UILabel *attrLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 150, 320 - 40, 90)];

attrLabel.attributedText = str;

attrLabel.numberOfLines = 0;

[self.view addSubview:attrLabel];

iOS 調試方法（利用lldb）

po _image 可以看到_imge 的信息

模擬器安裝app

xcrun simctl install booted +APP的路徑

文本框鍵盤遮擋問題

UINavigationControllerDelegate

_niChenText.delegate=self;

[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardWillShow:)name:UIKeyboardWillShowNotificationobject:nil];

[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardWillHide:)name:UIKeyboardWillHideNotificationobject:nil];

@property (strong,nonatomic)UITextField *SelectTextField;

鍵盤顯示事件

- (void) keyboardWillShow:(NSNotification *)notification {

獲取鍵盤高度，在不同設備上，以及中英文下是不同的

CGFloat kbHeight = [[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;

計算出鍵盤頂端到inputTextView panel底端的距離(加上自定義的緩衝距離INTERVAL_KEYBOARD)

CGFloat offset = (_SelectTextField.frame.origin.y+_SelectTextField.frame.size.height+50) - (self.view.frame.size.height - kbHeight);

取得鍵盤的動畫時間，這樣可以在視圖上移的時候更連貫

double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

將視圖上移計算好的偏移

if(offset > 0) {

[UIView animateWithDuration:duration animations:^{

self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);

}];

}

鍵盤消失事件

- (void) keyboardWillHide:(NSNotification *)notify {

鍵盤動畫時間

double duration = [[notify.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

視圖下沉恢復原狀

[UIView animateWithDuration:duration animations:^{

self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

}];

}

- (void)textFieldDidBeginEditing:(UITextField *)textField{

_SelectTextField=textField;

}

-(BOOL)textFieldShouldReturn:(UITextField *)textField

{

[textField resignFirstResponder];

return YES;

}

圖片拉神

UIImage * resizeImage=[normal resizableImageWithCapInsets:UIEdgeInsetsMake(h, w, h, w)];

背景單擊事件

@interface LCTianJianDiZhiController ()<HZAreaPickerDelegate,UIGestureRecognizerDelegate>

UITapGestureRecognizer *tapGestureRecognize = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(backGroundOnclick)];

tapGestureRecognize.delegate = self;

[self.view addGestureRecognizer:tapGestureRecognize];

-(void)backGroundOnclick

{

[_selectDiQu setTitle:@"選擇" forState:UIControlStateNormal];

[self.view endEditing:YES];

[self cancelLocatePicker];

}

以下情況不能交互

alpha<0.01

hidden=yes

userInteracion=no

父視圖不允許交換，子視圖也不能

在父圖可見範圍內可以交換，範圍之外不能交互

UiImageView 默認不允許用戶交互

uitableviewcell 點擊沒有效果

cell.selectionStyle = UITableViewCellSelectionStyleNone;

隱藏導航欄

[self.navigationController setNavigationBarHidden:YES animated:NO];

隱藏標籤欄

self.tabBarController.tabBar.hidden =YES;

時間戳轉換爲時間

NSString *str=[_mydata[indexPath.row]valueForKey:@"appr_comment_time"];時間戳

NSTimeInterval time=[str doubleValue]/1000+28800;因爲時差問題要加8小時 == 28800 sec

NSDate *detaildate=[NSDate dateWithTimeIntervalSince1970:time];

NSLog(@"date:%@",[detaildate description]);

實例化一個NSDateFormatter對象

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

設定時間格式,這裏可以設置成自己需要的格式

[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSString *currentDateStr = [dateFormatter stringFromDate: detaildate];

NSLog(@"%@",currentDateStr);

密碼文本框secureTextEntry

把數據存儲到本地

存儲

獲取userDefault單例

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

登陸成功後把用戶名和密碼存儲到UserDefault

[userDefaults setObject:_userName.text forKey:@"name"];

[userDefaults setObject:_password.text forKey:@"password"];

[userDefaults synchronize];

調用

獲取UserDefault

NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];

_userName.text= [userDefault objectForKey:@"name"];

_password.text= [userDefault objectForKey:@"password"];

頁面切換的方式

從一個ViewController切換到另一個ViewController有下面幾種方法：

（1）addsubview方法切換視圖

self.view addSubview:(加載的新頁面);

相應的 [self.view removeFromSuperview];移除添加的view

（2）self.view insertSubview:(加載的新頁面) atIndex:n;

對n的解釋：頁面都是層次疊加的，n表示加載到那一層上面

（3）presentModalViewController方法

photoNacController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;

photoNacController.modalPresentationStyle = UIModalPresentationFullScreen;

self presentModalViewController:(加載的新頁面) animated:

modalTransitionStyle用於設置頁面切換的動畫

modalPresentationStyle用於設置視圖顯示的方式

兩種方法試試就知道用途了！

(4) pushViewController導航

[self.navigationController pushViewController:(加載的新頁面) animated:YES];

對應的

[self.navigationController popViewControllerAnimated:YES];

總結：系統提供了我們視圖切換的方法以及視圖切換的默認動畫，我們可以選擇這幾種方法中的去使用，也可以自定義切換的動畫animation

/** 隱藏狀態欄 */

- (BOOL)prefersStatusBarHidden

{

return YES;

}

調整邊距，可以讓表格視圖讓開狀態欄

self.tableView.contentInset = UIEdgeInsetsMake(20, 0, 0, 0);

代刪除線的UILabel

- (void)drawRect:(CGRect)rect {

Drawing code

[super drawRect:rect];

CGContextRef context=UIGraphicsGetCurrentContext();

CGContextMoveToPoint(context, 0, 8);

CGContextAddLineToPoint(context, rect.size.width, rect.size.height-5);

CGContextStrokePath(context);

}

從xib加載時如果不顯示或出錯就可能是伸縮的問題

dropdown.autoresizingMask=UIViewAutoResizingNone;

unbutton 設置圓角邊框

[huoQuYanZhenMa.layer setMasksToBounds:YES];

[huoQuYanZhenMa.layer setCornerRadius:10.0]; 設置矩形四個圓角半徑

[huoQuYanZhenMa.layer setBorderWidth:1.0]; 邊框寬度

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

CGColorRef colorref = CGColorCreate(colorSpace,(CGFloat[]){ 1, 0, 0, 1 });

[huoQuYanZhenMa.layer setBorderColor:colorref];邊框顏色

[self.view addSubview:huoQuYanZhenMa];

界面跳轉

- (void)pushAction{

PushViewController *pushVC = [[PushViewController alloc] init];

[self.navigationController pushViewController:pushVC animated:YES];

RootViewController *rootVC = (RootViewController *)self.tabBarController;

[rootVC showTabBar:NO];

[self.navigationController showViewController:<#(UIViewController *)#> sender:<#(id)#>]

}

- (void)presentAction{

ModalViewController *modalVC = [[ModalViewController alloc] init];

模態視圖

[self presentViewController:modalVC animated:YES completion:nil];

}

- (void)dismissAction{

[self dismissViewControllerAnimated:YES completion:nil];

}

- (void)popAction{

[self.navigationController popViewControllerAnimated:YES];

}

UIStoryboard *stryBoard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];

[self presentViewController:[stryBoard instantiateViewControllerWithIdentifier:@"mytabBarContol"] animated:NO completion:nil];

語法約定

方法首字母大小，單詞切換用大寫

類名要大寫

初始化應用要initW～～，w一定要大些，並且前面一定是init纔行；不然self＝［super init］會出錯

打印結構體

NSLog(@“%@”,nSStringFromRange(range));

代理的作用

監聽哪些不能用addTarget監聽的事件

主要用來負責兩個對象之間的消息傳遞

代理實現的步驟

（1）成爲（子）控件的代理，父親（控制器）成爲兒子（文本框）的代理

（2）遵守協議，利用智能提示具體實現

代理的id應該用weak 弱引用，不然會照成循環引用

判斷是否實現某個協議方法

if ([self.delegate respondsToSelector:@selector(tgFooterViewDidDowenLoadButton:)]) {

[self.delegate tgFooterViewDidDowenLoadButton:self];

}

代理模式：是父控件（視圖控制器）監聽子控件的事件，當子控件發生某些事情時通知父控件工作

footerView->controller 去工作，用代理

conterView->footerView去工作，直接調用用footView的方法

不要分割線

tabQQChat.separatorStyle=UITableViewCellSeparatorStyleNone;

內邊距

_textView.contentEdgeInsets=UIEdgeInsetsMake(20, 20, 20, 20);

獲取文本的寬高

正文

CGFloat textX;

CGFloat textY=iconY;

CGSize textmaxSize= CGSizeMake(150, MAXFLOAT);

CGSize textRealSizw=[message.text boundingRectWithSize:textmaxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:15.0f]} context:nil].size;

模型中數據中文亂碼

對象描述方法，類似toStrong

-(NSString *)description

{

return [NSString stringWithFormat:@"=<%@: %p>{answer: %@,icon:%@,title:%@,option:%@}",self.class,self ,self.answer,self.icon,self.title,self.options];

}

然後在viewDidLoad中

NSLog(@"%@",self.question);

然後導入NSArray＋Log.h

改變狀態欄的顏色

-(UIStatusBarStyle)preferredStatusBarStyle

{

return UIStatusBarStyleLightContent;

}

隱藏返回按鈕文字

[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)

forBarMetrics:UIBarMetricsDefault];

uitableVIew的背景圖片

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"leftMenu.jpg"]];

self.tableView.backgroundView = imageView;

分割線

self.tableView.separatorStyle=UITableViewCellSeparatorStyleLSingleLine;

刪除多餘的分割線

self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];//tableView刪除多餘的分割線

- (void)setExtraCellLineHidden: (UITableView *)tableView

{

UIView *view = [UIView new];

view.backgroundColor = [UIColor clearColor];

[tableView setTableFooterView:view];

}

Cell中的代理方法

/**

初始化方法

使用代碼創建Cell的時候會被調用，如果使用XIB或者Storyboard，此方法不會被調用

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier

/**

從XIB被加載之後，會自動被調用，如果使用純代碼，不會被執行

- (void)awakeFromNib

Cell 被選中或者取消選中是都會被調用

如果是自定義Cell控件，所有的子控件都應該添加到contentView中

- (void)setSelected:(BOOL)selected animated:(BOOL)animated

UIView的常用方法：

－（void）addSubview:(UIVIew *)view;添加一個子控件

－（void）removeFromSuperview; 從父控件中移除

－（UIView *）viewWithTag:(NSInteger)tag;根據tag表示尋找到對應的控件（一般是用於尋找子控件）

加載xib文件：

NSArray *array=[[NSBundle mainBundle] loadNibName:@“HMAppView”owne:nil options:nil];

UIView *view=[array firstObject];

計算給定文本字符串

UILabel要換行就要給設置行爲0；

_textView.numberOfLines=0;

boundingRectWithSize計算給定文本字符串所佔的區域

返回值是一個x,y = 0的CGRect,w,h是計算好的寬高

如果要計算多行的準確高度，需要傳入NSStringDrawingUsesLineFragmentOrigin選項

dict用於指定字體的相關屬性的字典，UIKit框架中的第一個頭文件

context: nil

NSDictionary *nameDict = @{NSFontAttributeName: kNameFont};

CGRect nameFrame = [self.status.name boundingRectWithSize:CGSizeMake(MAXFLOAT, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:nameDict context:nil];

nameFrame.origin.x = CGRectGetMaxX(self.iconView.frame) + padding;

nameFrame.origin.y = padding + (self.iconView.bounds.size.height - nameFrame.size.height) * 0.5;

self.nameView.frame = nameFrame;

代碼塊存放路徑：

/Users/a625/Library/Developer/Xcode/UserData/CodeSnippets

uitableview繼承自uiscrollview

需要知道共有多少行，每一行有多高才能計算出UIscrollview的高度

知道每一行的高度，就可以計算出每一個屏幕顯示多數航，才計算出表格明細方法的執行次數

tableview .rowhight 的效率比代理更高，如果行高一樣就用屬性，不一樣用代理

修改控件大小：

－（IBAction）top:(UIButton *)sender{

CGRect btnFrame=self.HeadBtn.Fram;

btnFrame.origin-=10;

self.headBtn.fram=btnFrame;

}

下面代碼錯誤的，oc規定不允許直接修改對象的結構體屬性的成員

self。headBtn.frmae.origin.y-＝10；

代碼創建按鈕：

1.創建一個自定義的按鈕

UIButton *btn=[UIButton buttonWithTypeCustom];

2.添加按鈕

[self.view addSubview:btn];

3.設置按鈕的位置和尺寸

btn.frame=CGRectMake(100,100,100,100);

4.監聽按鈕的點擊事件（點擊按鈕後就會調用self的btnClick方法）

[btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];

5.設置按鈕在在默認狀態下的屬性

5.1默認狀態下的背景

[btn setBackgroundImage:[UIImage imageName@“btn_01”] forState:UIControlStateNormal];

5.2.設置默認狀態下的文字：千萬不要用btn.titleLabel.text=@“sdsd”;

[btn setTitle:@“點我啊”forState:UIControlStateNormal];

5.3 默認狀態的文字顏色

[btn setTitleColor:[UIColor redColor]forState:UIControlStateNormal];

6.設置按鈕在高亮狀態下的屬性

6.1 高亮狀態的背景

[btn setBackgroupImage:[UIImage imageName:@“btn_01”] forState:UIControlStateHighlighted];

6.2 高亮狀態下的文字顏色

[btn setTitle:@“摸我幹啥”forState:UIControlStateHighlighted];

6.3 高亮狀態下文字顏色

[btn setTitleColor:[UIColor blueColor] forState:UIControlStateHightlighted];

修改按鍵的字體(titleLabel 是隻讀的 readonly 表示不允許修改titleLabel的指針)

btn.titleLabel.font=[UIFont sysTemFontOfsize 13];

sender.currentTitle 取出當前按鈕的標題文字

CGRectGetMaxY（lable.frame）；

frame屬性，一般不要修改，通常用於實例化控件，指定初始位置

如果需要改變控件大小，使用bounds

如果需要改變控件位置，使用center

@property

1.生成getter（）方法

2.生成setter（）方法

3生成帶下劃線的成員變量（紀錄屬性內容）

readonly的屬性不會生成帶下劃線的成員變量

@synthesize 可以合成出來 @synthesize image＝_image;

代理的相關

1.遵守相關的協議，預先定義好方法，具體的實現工作有代理負責

<控件名稱＋DataSource> 定義的數據有關的方法

<控件名稱＋Delegate> 定義的與事件有關的方法，通常用來監聽控件事件的

2.代理方法

1> 方面名以控件名稱開口（沒有前綴） ->方便程序員編寫的時候快速找到需要的方法

2> 第一個參數是自己 ->意味着在協議方法中可以直接訪問對象的屬性，或者調用方法

3>代理方法的返回值 ->控制器向控件（委託）發送數據

內存管理：

控件：

如果是託線，用Weak

如果是代碼，用Strong

NString 用copy

數字型的int 使用Assig

圖片：

JPG:壓縮比較高，通常用於照片，網頁，有損壓縮，解壓縮時對cpu消耗大，意味慢，費電

PNG: 壓縮比高，無損壓縮，

UIScrollView

self.scrollView.contentInset=UIEdgeInsetsMake(20, 20, 20, 20);

self.scrollView.showsHorizontalScrollIndicator=NO;

self.scrollView.showsVerticalScrollIndicator=NO;

偏移位置

self.scrollView.contentOffset=CGPointMake(100, 100);

self.scrollView.bounces=NO;取消彈簧效果

contentSize 會根據邊距調整offset

contentInset 不會調整offset

動畫的兩種方式：

1.頭尾式

[UIView beginAnimations:nil context:nil];

/**需要執行的動畫**/

[UIViewcommitAnimations];

2.Block式

[UIView animateWithDuration:0.5 animations:^{

/**需要執行動畫的代碼**/

}];

修改控件的位置和尺寸：

位置

frame.origin 原點

center 中心

尺寸：

frame.size

bounds.sizes

查看是否調用該函數

NSLog(“％@”，__func__);

在get方法中

，如果跟自己相關的用下劃線，不相干的用self

字典轉模型

-(NSArray)appList

{

if(appList==nil)

{

NSArray *array=[NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] PathForResouce:@“app.plist” ofType:nil]];

創建一個臨時數組

NSMutableArray *arrayM=[MSMutableArray array];

for(NSDictionary *dict in array)

{

HMAppInfo *appInfo=[[HMAppInfo alloc]init];

appInfo.name=dict[@“name”];

appInfo.icon =dict[@“icon”];

[arrayM oddObject:appInfo];

}

將臨時數組複製給屬性

_appList=arrayM;

}

return _appList;

}

使用時：

先實例化：HMAppInfo *appInfo=self.appList[i];

再使用： icon.image=[UIImage imageName:appInfo.icon];

UITextView 光標不再最開始位置

self.automaticallyAdjustsScrollViewInsets = NO;

設置標籤欄屬性

UITabBarItem*item =self.tabBarController.tabBar.items[0];

UIImage*imageNomal = [[UIImage imageNamed:@"table_zhuye_off"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

item.image= imageNomal;

UIImage*imageSelected = [[UIImage imageNamed:@"table_zhuye_on"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

item.selectedImage= imageSelected;

self.tabBarController.tabBar.barTintColor = [UIColor whiteColor];

self.tabBarController.tabBar.translucent = false; 關閉透明

self.tabBarController.tabBar.tintColor = [UIColor colorWithRed:0.359 green:0.902 blue:0.296 alpha:1.000];

退出鍵盤

方法一：［self.textfield resigFirstResponder］;

方法二：[self.view endEditing:YES];Yes是否性關閉鍵盤

transform修改控件的位移（位置），縮放，旋轉

創建一個transform屬性相對初始

CGAffineTransForm CGAffineTransformMakeTransLation(CGFloat tx,CGFloat ty);左右移動

CGAffineTransForm CGAffineTransformMakeScale(CGFloat sx,CGFloat sy);放大縮小

CGAffineTransForm CGAffineTransformMakeRotaton(CGFloat angle); angle是弧度制，，排M_PI_4

在某個transform的基礎上進行疊加

CGAffienTransForm CGAffienTransformTransSlate(CGAffienTransForm t,CGFloat tx.CGFloat ty);

CGAffienTransForm CGAffienTransFormScale(CGAffienTransform t , CGFloat sx,CGFloat sy);

CGAffienTransForm CgAffeinTransformRotate(CGAffienTransform t,CGFloat angle);

清空之前設置的transForm屬性

view.transfrom=CGAffineTransformIdentity;

例：

self.butotn.transform=CGAffineTransForMakeTranslation(0,-100);向上平移100；

NSLog(@“%@”,NSStringFromCGAffineTRansfor(self.button.transform));

self.button.transform=CGAffineTransFormRotate(self.button.transform,-M_PI_4);//逆時針旋轉45度

UIImage加載圖片：

一個UIImage對象代表了一張圖片，一般通過Image：@”圖片名“加載圖片（png格式的圖片可以省略拓展名）

UIImage ＊image＝［UI image imageName：@“btn_01”］；

imageNamed :圖像是實例化之後由系統負責，

String *path=[[NSBundle mainBundle] pathForResource:imageName];

可以使用：UIImae *image=［UIImage imageWithContentsOfFile:path］；//但是不能放在images.xcassets

解析Plist文件

1.獲取Plist文件路徑

NSBundle *bundle=[NSBundle MianBundle];

NSString *path=[bundle pathForResource:@“imageData” ofType:@“plist”];

2.懶加載Plist文件

_image=[NSArray arrayWithContentOfFile:path];

-(NSArray *)image

{

if(_image==nil){

NSBundle *bundle=[NSBundle MianBundle];

NSString *path=[bundle pathForResource:@“imageData” ofType:@“plist”];

_image=[NSArray arrayWithContentOfFile:path];

}

return _image;

}

get（）懶加載

在get（）方法中不要在調用get（）方法了，self.btn是屬於get（）方法,_btn 是變量名，不屬於get（）方法

在懶加載中屬於get（）方法，所有懶加載中不能出現self.btn~ 不然會出現死循環

時鐘

scheduledTimerWithTimeInterval 方法本質上就是創建一個時鐘，

添加到運行循環的模式是DefaultRunLoopMode

self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTimer:) userInfo:@"hello timer" repeats:YES];

與1等價

self.timer = [NSTimer timerWithTimeInterval:1.0 target:self selector:@selector(updateTimer:) userInfo:nil repeats:YES];

將timer添加到運行循環

模式：默認的運行循環模式

[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSDefaultRunLoopMode];

self.timer = [NSTimer timerWithTimeInterval:1.0 target:self selector:@selector(updateTimer:) userInfo:nil repeats:YES];

將timer添加到運行循環

模式：NSRunLoopCommonModes的運行循環模式（監聽滾動模式）

[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];

停止時鐘

[self.timer invalidate];

枚舉

枚舉類型本質上是整數，定義的時候，如果指定了第一個整數值，然後後面的就會遞增

枚舉時解決魔法數字的很好工具

typedef enum｛

KmovingDirTop=10;

KmovingDirBottom;

KmovingDirLeft;

KmovingDirRigth

｝KmoingDir;

通知中心傳值：

發送通知

[[NSNotificationCenter defaultCenter]postNotificationName:@"categoryDidChanged" object:nil userInfo:@{@"categoryModel":_seletedModel}];

接受：

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(categoryChange:) name:@"categoryDidChanged" object:nil];

- (void)categoryChange:(NSNotification*)noti{

CategoriyModel *md = (CategoriyModel*)noti.userInfo[@"categoryModel"];

NSString *str = noti.userInfo[@"subCategoryName"];

NSLog(@"左表：%@",md.name);

NSLog(@"右表：%@",str);

}

- (void)dealloc{

[[NSNotificationCenter defaultCenter]removeObserver:self];

}

UITableviewCell 更新

一個section刷新

NSIndexSet *indexSet=[[NSIndexSet alloc]initWithIndex:2];

[tableview reloadSections:indexSet withRowAnimation:UITableViewRowAnimationAutomatic];

一個cell刷新

NSIndexPath *indexPath=[NSIndexPath indexPathForRow:3 inSection:0];

[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath,nil] withRowAnimation:UITableViewRowAnimationNone];

獲取屏幕高度

#define kScreenWidth [UIScreen mainScreen].bounds.size.width

#define kScreenHeight [UIScreen mainScreen].bounds.size.height

生成隨機數

arc4random_uniform(10) => 0~9之間的隨機數

ARC 編譯：

-fno-objc-arc

AFNetworking 的使用:

1.創建

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

2.指定解析器

manager 默認情況下是解析 json plist

xml 手動設置

manager.responseSerializer

manager.requestSerializer

aplication/json text/json

3.get/post 請求

接口地址 urlString

請求參數

網絡請求成功後的回調 blocks

[manager GET:<#(NSString *)#> parameters:<#(id)#> success:^(AFHTTPRequestOperation *operation, id responseObject) {

成功後的操作

operation.resposeData

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

請求失敗後的操作

NSLog(@"%@",error);

}];

post

[manager POST:url parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {

發送後的回調

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

發送失敗後的回調

}];

1. 網絡下載數據然後把數據轉爲圖片再加載

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"image/jpeg"];

[manager GET:imageURL parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {

NSLog(@"下載圖片成功！");

iv.image = [UIImage imageWithData:operation.responseData];

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

NSLog(@"%@",error);

}];

-(void)download{

&tag=1001011&telephone=18398850943&password=111111

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

manager.responseSerializer = [AFHTTPResponseSerializer serializer];

manager.requestSerializer = [AFHTTPRequestSerializer serializer];

[manager GET:@"http://120.25.160.35:8080/LocalGoodBrand/UserServlet" parameters:

@{@"tag" : @"100111"}

success:^(AFHTTPRequestOperation *operation, id responseObject) {

NSString *string=[[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];

NSData* jsonData=[string dataUsingEncoding:NSUTF8StringEncoding];

_dataArray= [NSJSONSerialization

JSONObjectWithData:jsonData

options:NSJSONReadingMutableContainers

error:nil];

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

NSLog(@"Error: %@", error);

}];

}

SDWebImage的使用：

[iv sd_setImageWithURL:[NSURL URLWithString:imageURL]];

UITapGestureRecognizer *tapGestureRecognize = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(backGroundOnclick)];

tapGestureRecognize.delegate = self;

[self.view addGestureRecognizer:tapGestureRecognize];

刪除storyboard：

1.刪除storyboard

2.general 中刪除“main”

2.info 中刪除 storyboard選項

3.屏幕初始化：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

self.window.backgroundColor = [UIColor whiteColor];

創建導航欄需要傳入一個UICollectionViewController

FirstViewController *fvc = [[FirstViewController alloc]init];

MyNavController *nav = [[MyNavController alloc]initWithRootViewController:fvc];

self.window.rootViewController = nav;//

[self.window makeKeyAndVisible];

return YES;

}

按鈕監聽事件：

- (void)addtarget:(id)target action:(SEL)action{

[self.button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];

}

[first addtarget:self action:@selector(firstClick)];

#pragma mark - 點擊事件

- (void)firstClick{

[self createPopver];

}

獲取plist文件數據

獲取plist文件地址

NSString *file = [[NSBundle mainBundle]pathForResource:@"categories.plist" ofType:nil];

加載plist爲數組

NSArray *plistArray = [NSArray arrayWithContentsOfFile:file];

關閉popview 的自動適應屏幕屬性：

pop.autoresizingMask = UIViewAutoresizingNone;

屏幕切換動態效果：

nav.modalPresentationStyle = UIModalPresentationFormSheet;

隱藏導航欄；

[self.navigationController setNavigationBarHidden:YES animated:YES];

設置tabbar的初始位置：

self.selectedIndex=button.1；

判斷網絡連接：

OOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

開啓網絡指示器

[[AFNetworkActivityIndicatorManager sharedManager] setEnabled:YES];

基準網站

NSURL *url = [NSURL URLWithString:@"http://baidu.com"];

監聽結果回調

AFHTTPRequestOperationManager *manager = [[AFHTTPRequestOperationManager alloc] initWithBaseURL:url];

NSOperationQueue *operationQueue = manager.operationQueue;

[manager.reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {

switch (status) {

case AFNetworkReachabilityStatusReachableViaWWAN:

case AFNetworkReachabilityStatusReachableViaWiFi:

[operationQueue setSuspended:NO];

NSLog(@"有網絡");

break;

case AFNetworkReachabilityStatusNotReachable:

default:

[operationQueue setSuspended:YES];

NSLog(@"無網絡");

break;

}

}];

開始監聽

[manager.reachabilityManager startMonitoring];

UILabel 自動換行和自適應

要想UI Label自動換行，line設置爲0

1.N行完全自適應：

UILabel *testLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 100, 21)];

NSString *txt = @"dffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";

testLabel.numberOfLines = 0; 相當於不限制行數

testLabel.text = txt;

這樣不行，還需要調用 [testLabel sizeToFit];

2.限制在N行內自適應：

UILabel *testLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 100, 21)];

NSString *txt = @"dffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";

testLabel.numberOfLines = 3; 限制在3行內自適應

testLabel.text = txt;

[testLabel sizeToFit];

結果不起作用，全部在一行顯示了。

3.爲了實現2的需求，需要這麼做：

CGSize maxSize = CGSizeMake(100, 21*3);

UILabel *testLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 100, 21)];

NSString *txt = @"dffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";

CGSize labelSize = [txt sizeWithFont:testLabel.font constrainedToSize:maxSize lineBreakMode: UILineBreakModeTailTruncation];

testLabel.frame = CGRectMake(testLabel.frame.origin.x, testLabel.frame.origin.y, labelSize.width, labelSize.height);

testLabel.text = txt;

NSString：

創建一個字符串常量

NSString *string1 = @"hello";

string1 = @"hello world";

NSLog(@"%@",string1);

創建字符串

NSString *string2 = [[NSString alloc] initWithString:@"hello"];

initWithFormat：多個字符串拼接

NSString *string3 = [[NSString alloc] initWithFormat:@"hello %@",string2];

NSLog(@"string2 = %@",string2);

NSLog(@"string3 = %@",string3);

NSString *ss1 = [[NSString alloc] initWithFormat:@"ZHANGsan"];

NSString *ss2 = [[NSString alloc] initWithFormat:@"zhangsan"];

NSLog(@"[ss1 caseInsensitiveCompare:ss2]:%ld",[ss1 caseInsensitiveCompare:ss2]);

創建空的字符串

NSString *string4 = [[NSString alloc] init]; //等價於string4 = @"";

stringWithFormat：使用類方法創建字符串對象

NSString *string5 = [NSString stringWithString:@"hello"]; //等價於string5 = @"hello";

NSString *string6 = [NSString stringWithFormat:@"hello %@",@"world"];

使用格式化符拼接數值

int number = 101;

NSString *string7 = [NSString stringWithFormat:@"class:%d",number];

NSLog(@"string7=%@",string7);

字符串的比較

NSString *s0 = @"Ediosn";

NSString *s11 = @"Edison"; //s0與s11的指針地址是一樣的，指向的都是常量區同一個字符串對象

NSString *s1 = [NSString stringWithFormat:@"Ediosn"];

NSString *s2 = [[NSString alloc] initWithFormat:@“Ediosn"];

判斷s1與s2的指針地址是否相等

if (s0 == s2) { 不相等，因爲是兩個對象，指針地址不一樣

NSLog(@"s0 == s2");

}

isEqualToString: 是比較兩個字符串內容是否相同

if ([s0 isEqualToString:s2]) {

NSLog(@"s0與s2的字符串內容相同");

}

NSObject *obj1;

NSObject *obj2;

NSString *string8 = @"a";

NSString *string9 = @"A";

compare: 比較字符串的大小

NSComparisonResult result = [string8 compare:string9];

if (result == NSOrderedAscending) { 結果爲升序

NSLog(@"string8 < string9");

} else if(result == NSOrderedSame) {

NSLog(@"string8 string9 內容一樣");

} else if(result == NSOrderedDescending) {

NSLog(@"string8 > string9");

}

length: 獲取字符串的長度

NSString *string10 = @"abcdef";

NSInteger len = [string10 length];

NSLog(@"len = %ld",len);

NSString *string11 = @"hELlo";

uppercaseString:將字符串中的字母轉成大寫

NSLog(@"upper:%@",[string11 uppercaseString]);

uppercaseString

NSLog(@"lower:%@",[string11 lowercaseString]);

capitalizedString:首字母大寫,其他字母小寫

NSLog(@"capitalized:%@",[string11 capitalizedString]);

將字符串轉成基本數據類型

NSString *string12 = @"3.14";

float f = (float)string12; 錯誤

floatValue:字符串中是一個浮點數值轉成float

float f = [string12 floatValue];

NSLog(@"floatValue:%f",f);

NSString *string13 = @"1";

BOOL bo = [string13 boolValue]; //true

---------------(4)字符串截取--------------------

NSString *string14 = @"abcdef";

---------------(4)字符串截取--------------------

NSString *substring1 = [string14 substringToIndex:3];

NSLog(@"substringToIndex:%@",substring1);

substringFromIndex:從指定索引位置開始截取到末尾，包含指定的索引f

NSString *substring2 = [string14 substringFromIndex:1];

NSLog(@"substringFromIndex:%@",substring2);

NSRange rang = {2,3}; 2:指定位置 3:需要截取的長度

substringWithRange:截取指定範圍的字符串

NSString *substring3 = [string14 substringWithRange:rang];

NSLog(@"substringWithRange:%@",substring3);

NSArray *array = [string componentsSeparatedByString:@"A"]; 從字符A中分隔成2個元素的數組

---------------(5)拼接字符串--------------------

NSString *str1 = @"Hello";

NSString *str2 = @"World";

NSString *str3 = @"OC!";

NSString *string15 = [NSString stringWithFormat:@"%@-%@-%@",str1,str2,str3];

NSLog(@"string15:%@",string15);

字符串追加

NSString *string16 = [string15 stringByAppendingString:@"-iOS"];

NSString *string17 = [string15 stringByAppendingFormat:@"%@,%@",@"iOS",@"iPhone"];

NSLog(@"string16:%@",string16);

NSLog(@"string17:%@",string17);

字符串追加

NSString *link = @"www.iphonetrain.com/.html";

rangeOfString:查找字符串所在的位置

NSRange linkRang = [link rangeOfString:@"html"];

if (linkRang.location != NSNotFound) {

NSLog(@"location:%ld,length:%ld",linkRang.location,linkRang.length);

}

例如：能查找到@163.com，說明此郵箱是網易郵箱

NSString *email = @"[email protected]";

/*___________________________NSMutableString(不可變字符串)__________________________*/

NSMutableString *mutableString1 = @"string"; 錯誤

NSMutableString *mutableString1 = [[NSMutableString alloc] initWithFormat:@"字符串"];

insertString: 在原有的字符串基礎上插入字符串

[mutableString1 insertString:@"可變" atIndex:0];

NSLog(@"mutableString1:%@",mutableString1);

NSMutableString *mutableString2 = [NSMutableString stringWithFormat:@"字符符符串"];

rangeOfString:查找指定字符串所在的範圍

NSRange rang3 = [mutableString2 rangeOfString:@"符符"];

deleteCharactersInRange:根據範圍刪除指定的字符串

[mutableString2 deleteCharactersInRange:rang3];

NSLog(@"mutableString2:%@",mutableString2);

NSMutableString *mutableString3 = [NSMutableString stringWithFormat:@"字符串"];

NSRange rang4 = [mutableString3 rangeOfString:@"字符"];

replaceCharactersInRange:withString: 字符串替換

[mutableString3 replaceCharactersInRange:rang4

withString:@"羊肉"];

NSLog(@"mutableString3:%@",mutableString3);

NSArray：

/*_________________________不可變數組(NSArray)_______________________________*/

---------------------1.數組的創建--------------------------

NSString *s1 = @"zhangsan";

NSString *s2 = @"lisi";

NSString *s3 = @"wangwu";

NSArray *array1 = [[NSArray alloc] initWithObjects:s1,s2,s3, nil];

NSLog(@"%@",array1);

類方法創建，注意：最後以nil結尾。

NSArray *array2 = [NSArray arrayWithObjects:s1,s2,s3, nil];

初始一個元素對象

NSArray *array3 = [NSArray arrayWithObject:s1];

創建一個數組，此數組中的元素來自array1

NSArray *array4 = [NSArray arrayWithArray:array1];

---------------------2.通過下標取元素--------------------------

NSString *str1 = [array4 objectAtIndex:0];

NSLog(@"str1 = %@",str1);

---------------------3.數組的元素個數--------------------------

NSUInteger count = [array4 count];

NSUInteger count2 = array4.count; 點語法等價於-> [array4 count];注意count是不能帶參數

NSLog(@"count2 = %ld",count2);

---------------------4.判斷是否包含某個對象--------------------------

BOOL isContains = [array4 containsObject:@"zhangsan"];

NSLog(@"isContains: %d",isContains);

---------------------5.對象在數組中的索引位置--------------------------

NSUInteger index = [array4 indexOfObject:@"wangwu"];

NSLog(@"index = %ld",index);

---------------------6.鏈接數組中的字符串--------------------------

注意：數組中的元素必須都是字符串，纔可以使用此方法

NSString *joinString = [array4 componentsJoinedByString:@","];

NSLog(@"join:%@",joinString); //zhangsan,lisi,wangwu

---------------------7.訪問最後一個元素--------------------------

NSString *last = [array4 lastObject]; //等價於點語法：array4.lastObject;

NSLog(@"last:%@",last);

---------------------8.在原來的數組上追加對象--------------------------

追加之後，創建了一個新的數組

NSArray *array5 = [array4 arrayByAddingObject:@"zhaoliu"];

NSLog(@"array5:%@",array5);

注意：1.數組中不能存放基本數據類型，只能存放對象

2.數組越界

NSArray *array6 = [NSArray arrayWithObject:100]; //錯誤，基本數據類型不能存放到數組中

int idx = 4;

if (idx < array5.count) { 嚴謹的寫法，只有下標小於元素個數時，纔可以使用下標取元素

[array5 objectAtIndex:idx];

}

---------------xcode4.4以後對數組的創建和訪問，語法上做了優化---------------

1.創建一個數組

NSArray *array7 = @[s1,s2,s3];

等價於NSArray *array2 = [NSArray arrayWithObjects:s1,s2,s3, nil];

NSLog(@"array7=%@",array7);

NSString *str = array7[0];

NSLog(@"array7[0] = %@",str);

/*_________________________可變數組(NSMutableArray)_______________________________*

NSString *t1 = @"zhangsan";

NSString *t2 = @"lisi";

NSString *t3 = @"wangwu";

---------------------1.創建可變數組--------------------------

NSMutableArray *marray1 = [[NSMutableArray alloc] initWithObjects:t1,t2,t3, nil];

創建數組時，開闢3個空間來存儲元素，當存儲的元素超過3個時，系統會自動增大此數組的空間

NSMutableArray *marray2 = [[NSMutableArray alloc] initWithCapacity:3];

NSMutableArray *marray3 = [NSMutableArray arrayWithCapacity:3];

新語法創建的是不可變數組

NSMutableArray *marray4 = @[s1,s2,s3]; //錯誤

---------------------2.添加元素--------------------------

[marray2 addObject:s1];

[marray2 addObject:s2];

[marray2 addObject:s3];

將marray2中所有的元素全都添加到marray3中

[marray3 addObjectsFromArray:marray2];

這是marray2添加到marray3中，marray3則是個二維數組

[marray3 addObject:marray2];

---------------------3.插入元素--------------------------

[marray2 insertObject:@"趙六" atIndex:0];