SWIFT 4无法使用高度

Question

我正在使用Swift 4＆amp;获取以下错误：

实例成员'高度'不能在类型的'cgrect'

上使用

使用以下代码时：

 let userInfo = notification.userInfo!
let keyboardFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
let keyboardFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
let changeInHeight = (CGRect.height(keyboardFrame) + 40) * (show ? 1 : -1)

我不知道为什么，任何帮助！

Answer 1

height是CGRect结构的属性。您正在访问它，就像是类方法一样。由于keyboardFrame是类型CGRect，因此您需要keyboardFrame.height。

let changeInHeight = (keyboardFrame.height + 40) * (show ? 1 : -1)

Answer 2

 var userInfo = notification.userInfo!
        let keyboardFrame:CGRect = (userInfo[UIResponder.keyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
        let animationDurarion = userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as! TimeInterval
        let changeInHeight = (keyboardFrame.height + 40) * (show ? 1 : -1)
        UIView.animate(withDuration: animationDurarion, animations: { () -> Void in
          self.bottomConstraint.constant += changeInHeight
        })