动态键盘高度

- (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];





}


//当键盘出现或改变时调用

- (void)keyboardWillShow:(NSNotification *)aNotification

{

    //获取键盘的高度

    NSDictionary *userInfo = [aNotification userInfo];

    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

    CGRect keyboardRect = [aValue CGRectValue];

    int height = keyboardRect.size.height;

}


//当键退出时调用

- (void)keyboardWillHide:(NSNotification *)aNotification

{



}