处理另一个应用程序'；iPad分割视图上的模糊键盘（iOS 9多任务）

以前，如果一个人在自己的应用程序上展示键盘，他会将所有内容嵌入

UIScrollView

中，并调整

contentInset

，以防止内容被键盘遮挡

现在，在iOS 9上使用拆分视图多任务处理，即使用户不再与其他应用程序交互，键盘也可能随时出现并保持可见

问题

---

有没有一种简单的方法可以调整所有不希望键盘可见的视图控制器，而不开始在ScrollView中嵌入所有内容？

秘密在于，只要在应用程序或运行的其他应用程序中显示/隐藏键盘，就会触发

UIKeyboardWillChangeFrame

通知和你的肩并肩

我创建了这个扩展，以便于开始/停止观察这些事件（我在

视图中将它们称为willbeen

/

invision

），并轻松获得

模糊高度，该高度通常用于调整表/集合/滚动视图的底部
contentInset

@objc protocol KeyboardObserver
{
    func startObservingKeyboard() // Call this in your controller's viewWillAppear
    func stopObservingKeyboard() // Call this in your controller's viewWillDisappear
    func keyboardObscuredHeight() -> CGFloat
    @objc optional func adjustLayoutForKeyboardObscuredHeight(_ obscuredHeight: CGFloat, keyboardFrame: CGRect, keyboardWillAppearNotification: Notification) // Implement this in your controller and adjust your bottom inset accordingly
}

var _keyboardObscuredHeight:CGFloat = 0.0;

extension UIViewController: KeyboardObserver
{
    func startObservingKeyboard()
    {
        NotificationCenter.default.addObserver(self, selector: #selector(observeKeyboardWillChangeFrameNotification(_:)), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
    }

    func stopObservingKeyboard()
    {
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
    }

    func observeKeyboardWillChangeFrameNotification(_ notification: Notification)
    {
        guard let window = self.view.window else {
            return
        }

        let animationID = "\(self) adjustLayoutForKeyboardObscuredHeight"
        UIView.beginAnimations(animationID, context: nil)
        UIView.setAnimationCurve(UIViewAnimationCurve(rawValue: (notification.userInfo![UIKeyboardAnimationCurveUserInfoKey]! as AnyObject).intValue)!)
        UIView.setAnimationDuration((notification.userInfo![UIKeyboardAnimationCurveUserInfoKey]! as AnyObject).doubleValue)

        let keyboardFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey]! as AnyObject).cgRectValue
        _keyboardObscuredHeight = window.convert(keyboardFrame!, from: nil).intersection(window.bounds).size.height
        let observer = self as KeyboardObserver
        observer.adjustLayoutForKeyboardObscuredHeight!(_keyboardObscuredHeight, keyboardFrame: keyboardFrame!, keyboardWillAppearNotification: notification)

        UIView.commitAnimations()
    }

    func keyboardObscuredHeight() -> CGFloat
    {
        return _keyboardObscuredHeight
    }
}

你能找到这个问题的答案吗？添加了我的解决方案。当应用程序启动时，键盘已经存在，这会发现这种情况吗？如果没有，你是怎么解决的？我调用
键盘遮挡高度（）
一旦打开
视图就会出现
@PeterJohnson。