Question

我正在使用键盘扩展应用，我需要默认键盘的高度。

为了获得KeyBoard的高度，我尝试了几十个解决方案like this，但是Selector函数永远不会被调用。有没有其他方法可以找到默认键盘的高度？

Answer 1

此代码将显示键盘的高度 -

func showKeyboard(notification: NSNotification) {
            if let sizeOFkeyboard = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
                let keyboardHeight = keyboardSize.height
            }
    }

Answer 2

这对我来说非常适合 Swift 4.1 ：

var keyboardHeight: CGFloat = 0.0

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

        // Register Notification, To know When Key Board Appear.
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: Notification.Name.UIKeyboardWillShow, object: nil)

        // Register Notification, To know When Key Board Hides.
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(true)

        // De register the notifications
        NotificationCenter.default.removeObserver(self)
    }

// MARK: - Keyboard Events

    @objc func keyboardWillShow(_ notification: Notification) {
        if let keyboardFrame: NSValue = notification.userInfo![UIKeyboardFrameEndUserInfoKey] as? NSValue {
            let keyboardRectangle = keyboardFrame.cgRectValue
            keyboardHeight = keyboardRectangle.height
        }
// use keyboard duration if needed (to animate your view)
        let keyboardDuration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as? Double

    }

    @objc func keyboardWillHide(_ notification: Notification) {

        let keyboardDuration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as? Double

    }

获取键盘高度使用NSNotificationCenter，在Swift 4.1中不起作用

2 个答案: