在開發(fā)中經(jīng)常用到監(jiān)聽鍵盤的彈出彈入，并據(jù)此進行一些操作。
1.注冊監(jiān)聽

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardWillHide:) name:UIKeyboardWillHideNotification object:nil];

2.根據(jù)監(jiān)聽獲取鍵盤的高度，以此進行后續(xù)一下操作

- (void)keyBoardWillShow:(NSNotification *)note
{
    // 獲取用戶信息
    NSDictionary *userInfo = [NSDictionary dictionaryWithDictionary:note.userInfo];
    // 獲取鍵盤高度
    CGRect keyBoardBounds  = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat keyBoardHeight = keyBoardBounds.size.height;
    // 獲取鍵盤動畫時間
   CGFloat animationTime  = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
    
}
//鍵盤收起
- (void)keyBoardWillShow:(NSNotification *)note{

}

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