iOS 获取键盘高度

- (void)viewDidLoad {
    [super viewDidLoad];
    //增加监听，当键盘出现或改变时收出消息
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    
    //增加监听，当键退出时收出消息
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
}
 
 
 
 
 
- (void)keyboardWillShow:(NSNotification *)aNotification
{
    //获取键盘的高度
    /*
     iphone 6:
     中文
     2014-12-31 11:16:23.643 Demo[686:41289] 键盘高度是  258
     2014-12-31 11:16:23.644 Demo[686:41289] 键盘宽度是  375
     英文
     2014-12-31 11:55:21.417 Demo[1102:58972] 键盘高度是  216
     2014-12-31 11:55:21.417 Demo[1102:58972] 键盘宽度是  375
     
     iphone  6 plus：
     英文：
     2014-12-31 11:31:14.669 Demo[928:50593] 键盘高度是  226
     2014-12-31 11:31:14.669 Demo[928:50593] 键盘宽度是  414
     中文：
     2015-01-07 09:22:49.438 Demo[622:14908] 键盘高度是  271
     2015-01-07 09:22:49.439 Demo[622:14908] 键盘宽度是  414
     
     iphone 5 :
     2014-12-31 11:19:36.452 Demo[755:43233] 键盘高度是  216
     2014-12-31 11:19:36.452 Demo[755:43233] 键盘宽度是  320
     
     ipad Air：
     2014-12-31 11:28:32.178 Demo[851:48085] 键盘高度是  264
     2014-12-31 11:28:32.178 Demo[851:48085] 键盘宽度是  768
     
     ipad2 ：
     2014-12-31 11:33:57.258 Demo[1014:53043] 键盘高度是  264
     2014-12-31 11:33:57.258 Demo[1014:53043] 键盘宽度是  768
     */
    NSDictionary *userInfo = [aNotification userInfo];
    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect = [aValue CGRectValue];
    int height = keyboardRect.size.height;
    int width = keyboardRect.size.width;
    NSLog(@"键盘高度是  %d",height);
    NSLog(@"键盘宽度是  %d",width); 
}
 
//当键退出时调用
- (void)keyboardWillHide:(NSNotification *)aNotification
{
}