android - 在 iOS 中管理键盘打开和隐藏时的屏幕显示和底部按钮与 Android 相同

Question

预期功能与 Android 设备中的功能相同(查看下图):

当键盘打开时，底部按钮会向上动画化，并且屏幕也会向上移动一点，具体取决于设备屏幕尺寸。检查下面的图片

我正在尝试在我的 iOS 应用程序中实现相同的功能。这是我的代码:

    @objc func keyboardWillChangeFrame(_ notification: Notification?) {
    guard let keyboardRect = (notification?.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue else {return}

    let screenY = UIScreen.main.bounds.height
    let shrunkViewHeight = screenY - keyboardRect.height
    self.forwardButton.frame.origin.y = keyboardRect.origin.y
    if (shrunkViewHeight < screenY/1.5) {
        let screenShift = ((screenY/2) - shrunkViewHeight)
        if notification?.name == UIResponder.keyboardWillShowNotification || notification?.name == UIResponder.keyboardWillChangeFrameNotification {
            UIView.animate(withDuration: 1.0) {
                self.view.frame.origin.y = screenShift

            }
        }else{
            UIView.animate(withDuration: 1.0) {
                self.view.frame.origin.y = 0
            }
        }
    }
}

目前发生的事情:该按钮有时会保留在底部，特别是当第一响应者在不关闭键盘的情况下从一个 TextField 更改为另一个 TextField 时。

预期解决方案:上述功能应适用于从 iPhone 6 到最新 XR 的所有 iPhone。接受第三方建议。

Answer 1

swift 3

@IBOutlet weak var BottomConstraint: NSLayoutConstraint! //your last item in bottom of your view controller constraint

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

    self.registerForKeyboardNotifications()
}

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

    self.deregisterFromKeyboardNotifications()
}


func registerForKeyboardNotifications() {
    NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardNotification(_:)), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
}

func deregisterFromKeyboardNotifications() {
    NotificationCenter.default.removeObserver(self)
}

func keyboardNotification(_ notification: Foundation.Notification) {

    if let userInfo = notification.userInfo {

        let endFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
        let duration:TimeInterval = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
        let animationCurveRawNSN = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber
        let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIViewAnimationOptions().rawValue
        let animationCurve:UIViewAnimationOptions = UIViewAnimationOptions(rawValue: animationCurveRaw)

        if (endFrame?.origin.y)! >= UIScreen.main.bounds.size.height {
            self.sendCmntViewBottomConstraint?.constant = 0.0
        } else {
            self.sendCmntViewBottomConstraint?.constant = endFrame!.size.height
        }

        UIView.animate(withDuration: duration, delay: TimeInterval(0), options: animationCurve, animations: { self.view.layoutIfNeeded() }, completion: nil)

    }
}