手势识别器不叫

当用户在文本框之外轻击时，我已经设置了一个用于解除键盘的手势识别器。 DismissKeyboard函数不会被调用。

我是否设置了观察者错误还是这是一个不同的问题？ 另外，这是一个正在挖掘的桌面视图。

代码摘录

 class CommentsViewController: UIViewController, UITableViewDelegate, UITableViewDataSource { override func viewDidAppear(animated: Bool) { super.viewDidAppear(animated) NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil) NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil) } func keyboardFrameChanged(notification: NSNotification) { println("keyboardFrameChanged") let userInfo = notification.userInfo let key = UIKeyboardFrameEndUserInfoKey if let info = userInfo { let frameValue = info[key] as! NSValue let _frame = frameValue.CGRectValue() } } func keyboardWillShow(notification: NSNotification) { if keyboardDismissTapGesture == nil { println("dismiss") keyboardDismissTapGesture = UITapGestureRecognizer(target: self, action: Selector("dismissKeyboard:")) self.view.addGestureRecognizer(keyboardDismissTapGesture!) } } func keyboardWillHide(notification: NSNotification) { if keyboardDismissTapGesture != nil { println("test2") self.view.removeGestureRecognizer(keyboardDismissTapGesture!) keyboardDismissTapGesture = nil } } func dismissKeyboard(sender: AnyObject) { println("dismiss keyboard") commentTextField.resignFirstResponder() } 

我在dismissKeyboard中设置了一个断点，但它甚至没有被调用。

产量

当我点击textview和键盘打开，这是输出

 keyboardFrameChanged keyboardFrameChanged will show dismiss 

当我点击其他任何东西（试图解除键盘），没有进一步的输出。

Answer 1

将手势识别器委托设置为您自己并添加UIGestureRecognizerDelegate协议。

 func keyboardWillShow(notification: NSNotification) { if keyboardDismissTapGesture == nil { println("dismiss") keyboardDismissTapGesture = UITapGestureRecognizer(target: view, action: "dismissKeyboard:") keyboardDismissTapGesture.delegate = self self.view.addGestureRecognizer(keyboardDismissTapGesture!) } } 

然后加：

 func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool { return true } 

我的猜测是，你的表格视图的手势正在干扰新的UITapGesture 。 试试这个解决scheme，否则当你检测到新的UITapGesture时，你应该会失败你的表视图的手势。

为了使表视图的UITapGestureRecognizer失败，我使用下面的代码：

 if let recognizers = yourTableView.gestureRecognizers, let index = find(recognizers.map { $0 is UITapGestureRecognizer }, true) { (recognizers[index] as! UIPanGestureRecognizer).requireGestureRecognizerToFail(keyboardDismissTapGesture) } 

也许不是最优雅的做法，但是当我想要失败UIPanGestureRecognizer时，它适用于我。 我还没UITapGestureRecognizer进行testing。

编辑：

 if let recognizers = yourTableView.gestureRecognizers, let index = find(recognizers.map { $0 is UIGestureRecognizer }, true) { (recognizers[index] as! UIGestureRecognizer).requireGestureRecognizerToFail(keyboardDismissTapGesture!) }