UITextView控件的用法詳解

1.創建並初始化
創建UITextView的文件，並在.h文件中寫入如下代碼：

1 #import <UIKit/UIKit.h>
2 
3 @interface TextViewController : UIViewController <UITextViewDelegate>{
4       UITextView *textView;
5 }
6 
7 @property (nonatomic, retain) UITextView *textView; 
8 
9 @end

 

在.m文件中初始化這個textview，寫入代碼如下：

 1 self.textView = [[[UITextView  alloc] initWithFrame:self.view.frame] autorelease]; //初始化大小並自動釋放
 2 
 3 self.textView.textColor = [UIColor blackColor];//設置textview裏面的字體顏色  
 4 
 5 self.textView.font = [UIFont fontWithName:@"Arial" size:18.0];//設置字體名字和字體大小  
 6 
 7 self.textView.delegate = self;//設置它的委託方法  
 8 
 9 self.textView.backgroundColor = [UIColor whiteColor];//設置它的背景顏色
10 
11 self.textView.text = @"Now is the time for all good developers to come to serve their country.\n\nNow is the time for all good developers to come to serve their country.";//設置它顯示的內容  
12 
13 self.textView.returnKeyType = UIReturnKeyDefault;//返回鍵的類型  
14 
15 self.textView.keyboardType = UIKeyboardTypeDefault;//鍵盤類型  
16 
17 self.textView.scrollEnabled = YES;//是否可以拖動  
18 
19 self.textView.autoresizingMask = UIViewAutoresizingFlexibleHeight;//自適應高度
20 
21 [self.view addSubview: self.textView];//加入到整個頁面中 

 

文本字段實現了UITextInputTrait協議，其提供了7個屬性來定義字段處理文本輸入的方式：autocapitalizationType、autocorrectionType、enablesReturnKeyAutomatically、keyboardAppearance、keyboardType、returnKeyType、secureTextEntry。

其它，當文本字段爲空時，placeholder文本以淺灰色顯示，提供一個用戶提示。通過設置clearButtonMode可以指定是否以及何時顯示清除按鈕。
2. UITextView退出鍵盤的幾種方式

（1）如果你程序是有導航條的，可以在導航條上面加多一個Done的按鈕，用來退出鍵盤，當然要先實現UITextViewDelegate。

- (void)textViewDidBeginEditing:(UITextView *)textView {    

   UIBarButtonItem *done =    [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(leaveEditMode)] autorelease];    

   self.navigationItem.rightBarButtonItem = done;        

}    

- (void)textViewDidEndEditing:(UITextView *)textView {    

    self.navigationItem.rightBarButtonItem = nil;  

} 

- (void)leaveEditMode {

    [self.textView resignFirstResponder];   

} 

（2）如果你的textview裏不用回車鍵，可以把回車鍵當做退出鍵盤的響應鍵。

#pragma mark - UITextView Delegate Methods     

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{    

if ([text isEqualToString:@"\n"]) {    

        [textView resignFirstResponder];    

return NO;    

    }

return YES;    

}

 

（3）還有你也可以自定義其他視圖控件加載到鍵盤上用來退出，比如在彈出的鍵盤上面加一個view來放置退出鍵盤的Done按鈕。

 1 UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];  
 2 
 3     [topView setBarStyle:UIBarStyleBlack];  
 4 
 5     UIBarButtonItem * helloButton = [[UIBarButtonItem alloc]initWithTitle:@"Hello" style:UIBarButtonItemStyleBordered target:self action:nil];        
 6 
 7     UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];  
 8 
 9       
10 
11     UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)];  
12 
13     NSArray * buttonsArray = [NSArray arrayWithObjects:helloButton,btnSpace,doneButton,nil];  
14 
15     [doneButton release];  
16 
17     [btnSpace release];  
18 
19     [helloButton release];  
20 
21     [topView setItems:buttonsArray];  
22 
23     [tvTextView setInputAccessoryView:topView];  
24 
25 -(IBAction)dismissKeyBoard  
26 
27 {  
28 
29     [tvTextView resignFirstResponder];  
30 
31 }