Swift 4 CGRect高度不能使用

Question

我正在使用 swift 4 并收到以下错误：

Instance member 'height' cannot be used on type 'CGRect'

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)

我不明白为什么，非常感谢任何帮助！

Answer 1

height 是 CGRect 结构的属性。您正在访问它，就像它是一种 class 方法一样。由于 keyboardFrame 是 CGRect 类型，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
        })

Swift 4 CGRect高度不能使用

Swift 4 CGRect height cannot be used

swift

cgrect