不同的键盘高度使文本视图之间切换时奇怪的框架

Question

我有一个登录屏幕，获取电子邮件和密码。密码文本字段是安全的，并且其结果具有不同的键盘高度。当我在电子邮件文本字段和密码字段之间切换时，首先不关闭键盘（在提供电子邮件键盘时单击密码），我的框架不会重新计算键盘高度，并且在区域键盘。 这是处理键盘在我的视图控制器的代码，很明显的问题是，keyboardWillHide/show FUNC的不被再次调用并计算出正确的高度的框架，如果他们没有被驳回：

private func setupKeyboard(){ 
     let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "dismissKeyboard") 
     view.addGestureRecognizer(tap) 

     NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil) 
     NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil) 
    } 
    func keyboardWillShow(notification: NSNotification){ 
     UIView.animate(withDuration: 2.0, animations: { 
      self.appLogo.alpha = 0 
     }) 
     if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue { 
      if self.view.frame.origin.y == 0{ 
       self.view.frame.origin.y -= (keyboardSize.height) 
      } 
     } 
    } 
    func keyboardWillHide(notification: NSNotification){ 
     self.appLogo.alpha = 1 
     if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue { 
      if self.view.frame.origin.y != 0{ 
       self.view.frame.origin.y += (keyboardSize.height) 
      } 
     } 
    } 

    func dismissKeyboard() { 
     //Causes the view (or one of its embedded text fields) to resign the first responder status. 
     appLogo.isHidden = false 
     view.endEditing(true) 
    } 

我正在寻找一种方法来解决这种情况，也许当我点击密码字段时，它会先解除电子邮件字段的键盘，然后打开密码键盘。 任何帮助表示赞赏。

Answer 1

主要问题是您正在使用相对偏移（对视图的原点进行相加和相减），而不是设置绝对值。这一点，加上一些不必要的原产地检查，造成了差距。试试这个：

func keyboardWillShow(notification: NSNotification){ 
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue { 
     self.view.frame.origin.y = -keyboardSize.height 
    } 
} 
func keyboardWillHide(notification: NSNotification){ 
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue { 
     self.view.frame.origin.y = 0 
    } 
}