学步园

- (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;        
}

//隐藏键盘
- (void)textFieldDidBeginEditing:(UITextField *)textField
{        
        CGRect frame = textField.frame;
        int offset = frame.origin.y + 32 - (self.view.frame.size.height
- 216.0);//键盘高度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开发中，发现UITextView没有想UITextField中textFieldShouldReturn:这样的方法，那么要实现UITextView return键隐藏键盘，可以通过判断输入的字符是不是回车符来实现。

首先，声明要实现UITextView 的delegate。

[plain]
@interface MyViewController :UIViewController <UITextViewDelegate> 

然后， 设置textView的delegate.
textView.delegate =self;

通常在viewDidLoad中设置此属性，或在nib（或storyboard）中。

最后，实现代理方法。

//隐藏键盘
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text 
{ 
    if ([text isEqualToString:@"\n"]) { 
        [textView resignFirstResponder];  
       return NO; 
   } 
   return YES; 
} 

这样，就实现了iOS中UITextView return键隐藏键盘。