ios常用代碼

1. 隨機數

1. srandom(time(NULL)); //隨機數種子
   
2. 
   
3. id d = random(); // 隨機數
   
4. 
   

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2. 視頻播放

1.     MPMoviePlayerController *moviePlayer;
   
2.     moviePlayer = [[MPMoviePlayerController alloc]
   
3.                    initWithContentURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Movie" ofType:@"m4v"]]];
   
4.     //初始化視頻播放器對象，並傳入被播放文件的地址
   
5.     moviePlayer.movieControlMode = MPMovieControlModeDefault;
   
6.     [moviePlayer play];
   
7.     //此處有內存溢出
   
8. 
   

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3.  啓動界面顯示

1. 
   
2. iPhone軟件啓動後的第一屏圖片是非常重要的往往就是loading載入中的意思。設置它說來也簡單，但是卻無比重要
   
3. 
   
4. 只需要在resource裏面將你希望設置的圖片更名爲Default.png，這個圖片就可以成爲iPhone載入的缺省圖片
   
5. 
   

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4. iPhone的系統目錄

1. *//得到Document目錄：
   
2. NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
   
3. NSString *documentsDirectory = [paths objectAtIndex:0];
   
4. 
   
5. //得到temp臨時目錄：
   
6. NSString *tempPath = NSTemporaryDirectory();
   
7. 
   
8. //得到目錄上的文件地址：
   
9. NSString *文件地址 = [目錄地址 stringByAppendingPathComponent:@"文件名.擴展名"];
   
10. 
    

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5. 狀態欄顯示Indicator

1. 
   
2. [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
   
3. 
   

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6.app Icon顯示數字

1. - (void)applicationDidEnterBackground:(UIApplication *)application{
   
2.     [[UIApplication sharedApplication] setApplicationIconBadgeNumber:5];
   
3. }
   
4. 
   

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7.sqlite保存地址

1.     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
   
2.     NSString *thePath = [paths objectAtIndex:0];
   
3.     NSString *filePath = [thePath stringByAppendingPathComponent:@"kilonet1.sqlite"];
   
4.    
   
5.     NSString *dbPath = [[[NSBundle mainBundle] resourcePath]
   
6.                         stringByAppendingPathComponent:@"kilonet2.sqlite"];  
   
7. 
   

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8.Application退出

1. exit(0);
   
2. 
   

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9. AlertView，ActionSheet的cancelButton點擊事件

1. 
   
2. -(void) actionSheet :(UIActionSheet *) actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex {
   
3.     NSLog(@"cancel actionSheet........");
   
4.     //當用戶按下cancel按鈕
   
5.     if( buttonIndex == [actionSheet cancelButtonIndex]) {
   
6.         exit(0);
   
7.     }
   
8. //    //當用戶按下destructive按鈕
   
9. //    if( buttonIndex == [actionSheet destructiveButtonIndex]) {
   
10. //        // DoSomething here.
    
11. //    }
    
12. }
    
13. 
    
14. - (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex {
    
15.      NSLog(@"cancel alertView........");
    
16.     if (buttonIndex == [alertView cancelButtonIndex]) {
    
17.         exit(0);
    
18.     }
    
19. }
    
20. 
    

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10.給Window設置全局的背景圖片

1. 
   
2. window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"coolblack.png"]];
   
3. 
   
4. 
   

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11. UITextField文本框顯示及對鍵盤的控制

1. 
   
2. #pragma mark -
   
3. #pragma mark UITextFieldDelegate
   
4. //控制鍵盤跳轉
   
5. - (BOOL)textFieldShouldReturn:(UITextField *)textField {
   
6.    
   
7.     if (textField == _txtAccount) {
   
8.         if ([_txtAccount.text length]==0) {
   
9.             return NO;
   
10.         }
    
11.         [_txtPassword becomeFirstResponder];
    
12.     } else if (textField == _txtPassword) {
    
13.         [_txtPassword resignFirstResponder];
    
14.     }
    
15.    
    
16.     return YES;
    
17. }
    
18. 
    
19. //輸入框背景更換
    
20. -(BOOL) textFieldShouldBeginEditing:(UITextField *)textField{
    
21.    
    
22.     [textField setBackground:[UIImage imageNamed:@"ctext_field_02.png"]];
    
23.    
    
24.     return YES;
    
25. }
    
26. 
    
27. -(void) textFieldDidEndEditing:(UITextField *)textField{
    
28.     [textField setBackground:[UIImage imageNamed:@"ctext_field_01.png"]];
    
29. }
    
30. 
    

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12.UITextField文本框前面空白寬度設置以及後面組合按鈕設置

1.   //給文本輸入框後面加入空白
   
2.     _txtAccount.rightView = _btnDropDown;
   
3.     _txtAccount.rightViewMode =  UITextFieldViewModeAlways;
   
4.    
   
5.     //給文本輸入框前面加入空白
   
6.     CGRect frame = [_txtAccount frame];
   
7.     frame.size.width = 5;
   
8.     UIView *leftview = [[UIView alloc] initWithFrame:frame];
   
9.     _txtAccount.leftViewMode = UITextFieldViewModeAlways;
   
10.     _txtAccount.leftView = leftview;
    
11. 
    
12. 
    
13. 
    

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13. UIScrollView 設置滑動不超出本身範圍

1. 
   
2. [fcScrollView setBounces:NO];
   
3. 
   
4. 
   

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14. 遍歷View裏面所有的Subview

1. 
   
2.     NSLog(@"subviews count=%d",[self.view.subviews count]);
   
3.     if ([self.view.subviews count] > 0) {
   
4.         for (UIView *curView in self.view.subviews) {
   
5.                        NSLog(@"view.subviews=%@", [NSString stringWithUTF8String:object_getClassName(curView)]);
   
6.         }
   
7.     }
   
8. 
   
9. 
   

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15. 在drawRect裏畫文字

1.    UIFont * f = [UIFont systemFontOfSize:20];
   
2. 
   
3.     [[UIColor darkGrayColor] set];
   
4.     NSString * text = @"hi \nKiloNet";
   
5.     [text drawAtPoint:CGPointMake(center.x,center.y) withFont:f];
   
6. 
   
7. 
   

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16. NSArray查找是否存在對象時用indexOfObject,如果不存在則返回爲NSNotFound.


17. NString與NSArray之間相互轉換

1. array = [string componentsSeparatedByString:@","];
   
2. string = [[array valueForKey:@"description"] componentsJoinedByString:@","];
   
3. 
   

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18. TabController隨意切換tab bar

1. 
   
2. [self.tabBarController setSelectedIndex:tabIndex];
   
3. 
   
4. 或者 self.tabBarController.selectedIndex = tabIndex;
   
5. 
   
6. 或者實現下面的delegate來撲捉tab bar的事件：
   
7. 
   
8. 代碼
   
9. -(BOOL) tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
   
10.    
    
11.     if ([viewController.tabBarItem.title isEqualToString: NSLocalizedString(@"Logout",nil)]) {
    
12.         [self showLogout];
    
13.         return NO;
    
14.     }
    
15.     return YES;
    
16. }
    
17. 
    

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19. 自定義View之間切換動畫

1. - (void) pushController: (UIViewController*) controller
   
2.          withTransition: (UIViewAnimationTransition) transition
   
3. {
   
4.     [UIView beginAnimations:nil context:NULL];
   
5.     [self pushViewController:controller animated:NO];
   
6.     [UIView setAnimationDuration:.5];
   
7.     [UIView setAnimationBeginsFromCurrentState:YES];        
   
8.     [UIView setAnimationTransition:transition forView:self.view cache:YES];
   
9.     [UIView commitAnimations];
   
10. }
    
11.     或者：
    
12. 
    
13. 代碼
    
14. CATransition *transition = [CATransition animation];
    
15. transition.duration = kAnimationDuration;
    
16. transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    
17. transition.type = kCATransitionPush;
    
18. transition.subtype = kCATransitionFromTop;
    
19. transitioning = YES;
    
20. transition.delegate = self;
    
21. [self.navigationController.view.layer addAnimation:transition forKey:nil];
    
22.    
    
23. self.navigationController.navigationBarHidden = NO;
    
24. [self.navigationController pushViewController:tableViewController animated:YES];
    
25. 
    

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20. UIWebView加載時白色顯示問題解決以及字體統一設置

1.     <B>uiWebView</B>.opaque = NO;
   
2. 
   

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21.計算字符串長度

1. CGFloat w = [title sizeWithFont:[UIFont fontWithName:@"Arial" size:18]].width;
   
2. 
   

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22.時間轉換NSString & NSDate

1. -(NSDate *)NSStringDateToNSDate:(NSString *)string {   
   
2. 
   
3.     NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
   
4.     [formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
   
5.     [formatter setDateFormat:@"yyyy-MM-dd"];
   
6.     NSDate *date = [formatter dateFromString:string];
   
7.     [formatter release];
   
8.     return date;
   
9. }
   
10. NSString *year = [myDate descriptionWithCalendarFormat:@"%Y" timeZone:nil locale:nil];
    
11. 
    
12. or
    
13. NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    
14. [formatter setDateFormat:@"yyyy"];
    
15. 
    
16. //Optionally for time zone converstions
    
17. [formatter setTimeZone:[NSTimeZone timeZoneWithName:@"..."]];
    
18. 
    
19. NSString *stringFromDate = [formatter stringFromDate:myNSDateInstance];
    
20. 
    

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23.模擬器的文件位置

1. 其中#username#表示當前用戶名:
   
2. /Users/#username#/Library/Application Support/iPhone Simulator/User/Applications/
   
3. 
   
4. 
   
5. 
   

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24.UISearchBar時背景透明

1. [[searchbar.subviews objectAtIndex:0]removeFromSuperview];
   
2. 
   

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25. 圖像與緩存

1. UIImageView *wallpaper = [[UIImageView alloc] initWithImage:
   
2.         [UIImage imageNamed:@"icon.png"]]; // 會緩存圖片
   
3. 
   
4. 
   
5. 
   
6. UIImageView *wallpaper = [[UIImageView alloc] initWithImage:
   
7.         [UIImage imageWithContentsOfFile:@"icon.png"]]; // 不會緩存圖片
   
8. 
   

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26.常用的對視圖圖層(layer)的操作

1. 對圖層的操作：
   
2. 
   
3. (1.給圖層添加背景圖片：
   
4. myView.layer.contents = (id)[UIImage imageNamed:@"view_BG.png"].CGImage;
   
5. 
   
6. (2.將圖層的邊框設置爲圓腳
   
7. myWebView.layer.cornerRadius = 8;
   
8. myWebView.layer.masksToBounds = YES;
   
9. 
   
10. (3.給圖層添加一個有色邊框
    
11. myWebView.layer.borderWidth = 5;
    
12. myWebView.layer.borderColor = [[UIColor colorWithRed:0.52 green:0.09 blue:0.07 alpha:1] CGColor];
    
13. 
    
14. 
    
15. 
    

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27. UIPopoverController 使用

1. -(void) onSetting:(id) sender {
   
2. 
   
3.     SplitBaseController *detail = [[SettingServerController alloc] init];
   
4. 
   
5.    
   
6.     CGRect frame = [(UIView *)sender frame];
   
7.     frame.origin.y = 0;
   
8.    
   
9.     UIPopoverController *popwin = [[UIPopoverController alloc] initWithContentViewController:detail];
   
10.     [popwin setPopoverContentSize:CGSizeMake(400, 300) animated:YES];
    
11.     popwin.delegate = self;
    
12.     [popwin presentPopoverFromRect: frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
    
13. 
    
14.     [detail release];
    
15. }
    
16. 
    

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28.在UINavigationBar中添加左箭頭返回按鈕

1. 
   
2. 在iPhone裏面最討厭的控件之一就是 UINavigationBar了。這個控件樣式修改不方便，連添加按鈕也特別麻煩。下面的例子是如何手動添加帶箭頭的按鈕：
   
3. 
   
4. UINavigationItem *item = [navBar.items objectAtIndex:0];
   
5. UINavigationItem *back = [[UINavigationItem alloc] initWithTitle:@"Back"];
   
6. NSArray *items = [[NSArray alloc] initWithObjects:back,item,nil];
   
7. [navBar setItems:items];
   
8. 
   
9. - (BOOL)navigationBar:(UINavigationBar *)navigationBar
   
10. shouldPopItem:(UINavigationItem *)item{
    
11. //在此處添加點擊back按鈕之後的操作代碼
    
12. return NO;
    
13. }
    
14. 
    

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29.UILable自動換行

1. CGSize titleBrandSizeForHeight = [titleBrand.text sizeWithFont:titleBrand.font];
   
2. CGSize titleBrandSizeForLines = [titleBrand.text sizeWithFont:titleBrand.font constrainedToSize:CGSizeMake(infoWidth, MAXFLOAT) lineBreakMode:UILineBreakModeWordWrap];
   
3. titleBrand.numberOfLines = ceil(titleBrandSizeForLines.height/titleBrandSizeForHeight.height);
   
4. if (titleBrand.numberOfLines <= 1) {
   
5. titleBrand.frame = CGRectMake(5, titleBrand.frame.size.height , infoWidth, titleBrandSizeForHeight.height);
   
6. }else {
   
7. titleBrand.frame = CGRectMake(5, titleBrand.frame.size.height , infoWidth, titleBrand.numberOfLines*titleBrandSizeForHeight.height);
   
8. }
   
9. 
   
10. 
    

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30.UIButton 點擊事件

1. //創建UIButton
   
2.      UIButton *sampleButton =[UIButton buttonWithType:UIButtonTypeRoundedRect];
   
3.     [sampleButton setFrame:CGRectMake(240,25,60,30)];
   
4.     [sampleButton setTitle:@"聊天" forState:UIControlStateNormal];
   
5.     [sampleButton.titleLabel setFont:[UIFont boldSystemFontOfSize:14]];
   
6.     [sampleButton addTarget:self action:@selector(onBtnClick:) forControlEvents:UIControlEventTouchUpInside];//onBtnClick爲方法名稱
   
7. 
   
8. -(void) onBtnClick:(id)sender
   
9. {
   
10.    NSLog(@"按鈕點擊事件");
    
11. }
    
12. 
    
13. 
    

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