轮流调用 UIKeyboardWideNotification

Question

我已经实现了这个：

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

因为我有一个滚动条和其他东西。但问题是iPad键盘上有一个隐藏键盘的按钮，但并没有停止编辑（闪烁的行依然存在）

我希望如果他隐藏键盘，文本在键盘动画时间后会自行消失。这很好用。

但是如果我旋转，该方法将被调用并且文本字段将自行退出（甚至被调用一次，而是三次）

UIKeyboardWillHideNotification当 UI 旋转时如何停止触发？

如果不是这样，当点击该按钮时，我如何正确地退出响应者？

这是我的代码：

float keyboardHeightSize;
- (void)keyboardWillShow:(NSNotification*)notification {
    keyboardHeightSize = [[[notification userInfo]objectForKey:UIKeyboardFrameEndUserInfoKey]CGRectValue].size.height;

    [_scroller setContentSize:CGSizeMake(0, 1954+keyboardHeightSize)];

}

- (void)keyboardWillHide:(NSNotification*)notification {

    [_scroller setContentSize:(CGSizeMake(0, 1954))];

    CGFloat keyboardAnimationDuration = [[[notification userInfo]objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];

    [self performSelector:@selector(resignResponders) withObject:nil afterDelay:keyboardAnimationDuration];

}

-(void)resignResponders {

    for (id textField in self.scroller.subviews)
    {
        if ([textField isKindOfClass:[UITextField class]])
        {
            UITextField *theTextField = textField;
            if ([theTextField isFirstResponder]) {
                [theTextField resignFirstResponder];

            }

        }
    }

}