Finger Tracking and Gesture Recognizing

Question

So I'm developing an app where I have all my gestures are being recognized. My problem comes when I attempt to add UIImageViews wherever the finger touches the screen.

These Views are to follow the finger, which they do, but the problem is I believe they are swallowing the touches not allowing the Gestures to be recognized. I have tried:

[_fingerHolder1 setUserInteractionEnabled:NO];
[_fingerHolder2 setUserInteractionEnabled:NO];

But it doesn't seem to change anything. I am adding these the View in the ccTouchesBegan/Moved/Ended methods, whereas the gestures are being recognized in their respective handlers.

I have looked at using the UIPanGesture but I'm having some trouble recognizing the swipes as well as setting the coordinates for theUIImageViews of the finger trackers while doing this. Should I experiment with this more or is there a different solution?

Any help is appreciated!

Answer 1

The UIImageView will receive and process touches, hence they will not be forwarded to the cocos2d OpenGL view (also a UIView).

To make this work you need to create a subclass of UIImageView and override each touches… method and manually forward the event to cocos2d's view, here's the example for touchesBegan:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [[CCDirector sharedDirector].view touchesBegan:touches withEvent:event];
}

Use this UIImageView subclass in place of the original ones you use currently.

That will make regular cocos2d touch events work, and it should also make UIGestureRecognizers behave as expected if you've added those to cocos2d's view.

Answer 2

If I understand what you need (please correct me if I'm wrong), you want to move some UIViews when a drag(pan) event is detected, but you also add UIImageViews when the user touches the screen and this disables the touches.

You should set UIIMageView.userInteractionEnable = YES(by default is set to NO), basically every view that should detect touches should have userInteractionEnable = YES.

If you want to ignore some touches on some subviews you should implement: -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch method of UIGestureRecognizerDelegate.

For handling different types of gesture you should implement the method: -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer { return YES; }