键盘高度在 Swift 中无法正常工作

Question

当键盘显示和隐藏时，我使用下面的代码来调整当前视图。 当键盘显示代码工作时，但当它隐藏视图时，滑动底部保持顶部的黑色空间。 如何解决？

@objc func keyboardWillAppear(notification: Notification){
    if let keyboardFrame: NSValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue {
        let keyboardRectangle = keyboardFrame.cgRectValue
        let keyboardHeight = keyboardRectangle.height
        self.view.frame.origin.y = -keyboardHeight/2
    }
}

@objc func keyboardWillHide(notification: Notification){
    if let keyboardFrame: NSValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue {
        let keyboardRectangle = keyboardFrame.cgRectValue
        let keyboardHeight = keyboardRectangle.height
        self.view.frame.origin.y = +keyboardHeight/2
    }
}

Answer 1

您可以转换视图而不是分配给原点

@objc func keyboardWillAppear(notification: Notification){
    if let keyboardFrame: NSValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue {
        let keyboardRectangle = keyboardFrame.cgRectValue
        let keyboardHeight = keyboardRectangle.height
        self.view.transform = CGAffineTransform(translationX: 0, y: -keyboardHeight/2)
    }
}

@objc func keyboardWillHide(notification: Notification){
        self.view.transform = .identity
}