當我的應用程序中出現鍵盤時，該按鈕部分向上移動（僅該按鈕的文本移動）

Question

我在屏幕底部的swift應用程序中有一個按鈕。它約束是：

我對於從屏幕底部分開我的按鈕的約束也連接插座：

當我運行應用程序時，我看到了我按鈕（我添加了一些背景色，以便我的示例清晰可見）：

現在，奇怪的事情發生了 - 當鍵盤顯露，按鈕上的文本向上移動，藍色的背景保持它是：

而且還按鈕的可見部分是不是點擊所有。

它是我的實現中的某種錯誤還是問題？

我的代碼是針對相當簡單：

@IBOutlet weak var continueUsernameBottomConstraint: NSLayoutConstraint! 

override func viewDidAppear(_ animated: Bool) { 
    super.viewDidAppear(animated) 


    NotificationCenter.default.addObserver(self, selector: #selector(tutorialKeyboardWillAppear), name: .UIKeyboardWillShow, object: nil) 

    NotificationCenter.default.addObserver(self, selector: #selector(tutorialKeyboardWillDisappear), name: .UIKeyboardWillHide, object: nil) 

} 


func tutorialKeyboardWillAppear(notification: NSNotification){ 
    print("KEYBOARD APPEARS") 
    let endFrame = ((notification as NSNotification).userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue 

    continueUsernameBottomConstraint.constant = view.bounds.height - endFrame.origin.y 

    self.view.layoutIfNeeded() 
} 

func tutorialKeyboardWillDisappear(notification: NSNotification){ 

    print("KEYBOARD DISAPPEARS") 
    let endFrame = ((notification as NSNotification).userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue 

    continueUsernameBottomConstraint.constant = view.bounds.height - endFrame.origin.y 

    self.view.layoutIfNeeded() 

} 

Answer 1

使用此

func tutorialKeyboardWillAppear(notification: NSNotification){ 
    print("KEYBOARD APPEARS") 
    let endFrame = ((notification as NSNotification).userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue 
    continueUsernameBottomConstraint.constant = continueUsernameBottomConstraint.constant + CGFloat(endFrame.height) 
    self.view.layoutIfNeeded() 
} 

func tutorialKeyboardWillDisappear(notification: NSNotification){ 

    print("KEYBOARD DISAPPEARS") 
    let endFrame = ((notification as NSNotification).userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue 
    continueUsernameBottomConstraint.constant = continueUsernameBottomConstraint.constant - CGFloat(endFrame.height) 
    self.view.layoutIfNeeded() 

}