UITapGestureRecognizer无法在iOS9上运行

Question

I have an application which uses UITapGestureRecognizers which seem to not work in iOS9 Beta 2.

They are successfully calling

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
  NSLog(@"shouldReceiveTouch");
  return YES;
}

but it doesn't hit any of the other UITapGesture delegate methods.

When I run the same application (from Xcode 7) on a device running on iOS 8, it works as expected.

Has anyone else hit this?

Here is how I initialise the UITapGestureRecognizer.

Edit
If I create the UITapGestureRecognizer in code instead of in the ViewController xib it works fine, so there's something up with the xib parsing in iOS9 or something.

_tapGesture2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onMainViewTap:)];
_tapGesture2.numberOfTapsRequired = 1;
_tapGesture2.delegate = self;
[self.view addGestureRecognizer:_tapGesture2];

Edit2
If I deleted the GestureRecognizer in the XIB and added it back in again using XCode 7, it also worked. When I did this, it added <pressTypeMask key="allowedPressTypes"/> into the xib under the UITapGestureRecognizer.

Answer 1

It seems that iOS9 looks for a <pressTypeMask key="allowedPressTypes"/> line in the xml of the gesture recognizer and the tap recognizer doesn't work without it. To fix you can either build your recognizers in code, add that line into the xml or delete and re-add the gesture recognizer in Xcode 7, which will properly add the pressTypeMask into the xml.

I wonder if apple will fix iOS9 to work without that line in the XML, but for now, this is an easy fix.

Answer 2

I ran into this problem as well, specifically when trying to get both my buttons and views w/ tap gestures within a table cell to respond to a click whose layout was defined in a xib. Worked fine on iOS 8 & 10, but not 9. The actual problem was that I added those to a custom uiview and assigned the view's class to my UITableViewCell subclass, rather than use a Table View Cell object within IB. Thus I did not add my subviews to the contentView that the IB object gives you, causing me the problem. The fix was to redo the xib to use the Table View Cell as my root, so I could attach my subviews to the Content View.

Answer 3

实现UIGestureRecognizer的所有可选委托将起作用。

Answer 4

I checked it via Xcode-7 beta 2

I've created vc with gesturerecognizer and create outlets for property and action. in viewDidload setted delegate, like this:

All methods, that was called during debug - i've marked //called

I received events to the next methods:

func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
    print("worked")
    // called
    return true
}

 func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool
 {
    //called
    print("worked")
    return true
}


 func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOfGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool
 {
    print("worked")
    //called
    return true
}

Try recreate project as i mentioned and check all your outlets and delegate

Hope this helps