Gesture Recognizer Not Called - ios

Question

I have set up a gesture recognizer for dismissing the keyboard when the user taps outside the textfield. DismissKeyboard function does not get called.
Have I set up the observer wrong or is this a different issue? Also, this is a tableview that is being tapped.
Code Excerpt
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()
}
I set a breakpoint at dismissKeyboard, but it doesn't even get called.
Output
When I tap the textview and the keyboard opens, this is the output
keyboardFrameChanged
keyboardFrameChanged
will show
dismiss
When I tap anything else (trying to dismiss the keyboard), no further outputs.

Answer 1

Set the gesture recognizer delegate to yourself and add the UIGestureRecognizerDelegate protocol.
func keyboardWillShow(notification: NSNotification) {
if keyboardDismissTapGesture == nil
{
println("dismiss")
keyboardDismissTapGesture = UITapGestureRecognizer(target: view, action: "dismissKeyboard:")
keyboardDismissTapGesture.delegate = self
self.view.addGestureRecognizer(keyboardDismissTapGesture!)
}
}
Then add:
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}
My guess is, the gesture of your table view is interfering with the new UITapGesture. Try this solution or else you should fail the gesture of your table view when your new UITapGesture is detected.
To fail the UITapGestureRecognizer of the table view I use this code:
if let recognizers = yourTableView.gestureRecognizers, let index = find(recognizers.map { $0 is UITapGestureRecognizer }, true) {
(recognizers[index] as! UIPanGestureRecognizer).requireGestureRecognizerToFail(keyboardDismissTapGesture)
}
Maybe not the most elegant way of doing it, but it works for me when I want to fail the UIPanGestureRecognizer. I haven't tested it with the UITapGestureRecognizer.
EDIT:
if let recognizers = yourTableView.gestureRecognizers, let index = find(recognizers.map { $0 is UIGestureRecognizer }, true) {
(recognizers[index] as! UIGestureRecognizer).requireGestureRecognizerToFail(keyboardDismissTapGesture!)
}