旋轉後接收到兩個不同高度的鍵盤

我有一個視圖，它在鍵盤出現時調整約束條件。所以我有鍵盤出現和消失時的通知。旋轉後接收到兩個不同高度的鍵盤

上述行爲發生在鍵盤已經顯示並且我旋轉屏幕時。隨後發生的下一個動作：

UIKeyboardWillHideNotification叫
UIKeyboardWillShowNotification稱爲（與舊的高度鍵盤）
UIKeyboardWillShowNotification稱爲（與鍵盤的新高度）

所以， updateView函數接收第一個高度，然後接收不同的高度。這導致視圖的奇怪移動調整了兩倍的值。

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() 

}

來源

2016-02-05 angeldev

不是很確定，但也許可以添加另一個觀察「UIKeyboardWillChangeFrameNotification」並處理其選擇器中的高度？ – Allen

@艾倫我認爲我會處於同樣的境地。我將不得不在UIKeyboardWillShowNotification中處理高度，並且UIKeyboardWillChangeFrameNotification也會以不同的高度被調用兩次。 – angeldev

最後我找到了解決方案。當我得到keyboardFrame時，我正在使用UIKeyboardFrameBeginUserInfoKey，它在動畫開始之前返回鍵盤的框架。正確的做法是使用UIKeyboardFrameEndUserInfoKey，它在動畫完成後返回鍵盤的框架。

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

來源

2016-02-05 12:23:44 angeldev

旋轉後接收到兩個不同高度的鍵盤

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