iOS监听键盘事件

1.先设置监听者以及监听对象和事件

 
 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
 
 
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
 
 
2.实现监听方法
 
 
 
  
(void)keyboardWillShow:(NSNotification *)notification {
 NSDictionary *userInfo = [notification userInfo];
 // 获取键盘的frame
 CGRect keyboardFrame = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
 // 获取键盘的动画时间
 NSTimeInterval animationDuration = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
 // do something
 }
 
  
(void)keyboardWillHide:(NSNotification *)notification {
 // do something
 }