旋转后接收到两个不同高度的键盘

我有一个视图，它在键盘出现时调整约束条件。所以我有键盘出现和消失时的通知。旋转后接收到两个不同高度的键盘

上述行为发生在键盘已经显示并且我旋转屏幕时。随后发生的下一个动作：

UIKeyboardWillHideNotification叫
UIKeyboardWillShowNotification称为（与旧的高度键盘）
UIKeyboardWillShowNotification称为（与键盘的新高度）

所以， updateView函数接收第一个高度，然后接收不同的高度。这导致视图的奇怪移动调整了两倍的值。

override func viewDidLoad() { 

    super.viewDidLoad() 

    // Creates notification when keyboard appears and disappears 
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil) 
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil) 

} 

deinit { 

    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil) 
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil) 

} 

func keyboardWillShow(notification: NSNotification) { 

    self.adjustingHeight(true, notification: notification) 

} 

func keyboardWillHide(notification: NSNotification) { 

    self.adjustingHeight(false, notification: notification) 

} 

private func adjustingHeight(show: Bool, notification: NSNotification) { 

    // Gets notification information in an dictionary 
    var userInfo = notification.userInfo! 
    // From information dictionary gets keyboard’s size 
    let keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue() 
    // Gets the time required for keyboard pop up animation 
    let animationDurarion = userInfo[UIKeyboardAnimationDurationUserInfoKey] as! NSTimeInterval 
    // Animation moving constraint at same speed of moving keyboard & change bottom constraint accordingly. 
    if show { 
     self.bottomConstraint.constant = (CGRectGetHeight(keyboardFrame) + self.bottomConstraintConstantDefault/2) 
    } else { 
     self.bottomConstraint.constant = self.bottomConstraintConstantDefault 
    } 
    UIView.animateWithDuration(animationDurarion) { 
     self.view.layoutIfNeeded() 
    } 

    self.hideLogoIfSmall() 

}

来源

2016-02-05 angeldev

不是很确定，但也许可以添加另一个观察“UIKeyboardWillChangeFrameNotification”并处理其选择器中的高度？ – Allen

@艾伦我认为我会处于同样的境地。我将不得不在UIKeyboardWillShowNotification中处理高度，并且UIKeyboardWillChangeFrameNotification也会以不同的高度被调用两次。 – angeldev

最后我找到了解决方案。当我得到keyboardFrame时，我正在使用UIKeyboardFrameBeginUserInfoKey，它在动画开始之前返回键盘的框架。正确的做法是使用UIKeyboardFrameEndUserInfoKey，它在动画完成后返回键盘的框架。

let keyboardFrame: CGRect = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()

来源

2016-02-05 12:23:44 angeldev

旋转后接收到两个不同高度的键盘

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