UIPanGestureRecognizer on MKMapView? - objective-c

Question

I would like to add some logic when user moves with map view i. e. he does a pan touch. But when I add the gesture recognizer and I want to log the touch, nothing happens. When I try it in another view controller and add the recognizer to controller's view then it works ok.
Here's my code (map view is a property of application delegate because I need to do some other things with it even if it isn't visible):
- (void)viewDidLoad
{
...
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(showPan)];
[appDelegate.mapView addGestureRecognizer:panGesture];
[panGesture release];
}
- (void)showPan
{
NSLog(#"pan!");
}
I use latest iOS 4.2.1
Thanks for any advice.

Answer 1

Ok, because no one knew, I had to spent one Apple technical support consult for it. ;o)
Because MKMapView evidently has its own recognizers to interact with user, you have to adhere to the UIGestureRecognizerDelegate protocol and implement (BOOL)gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: like this:
- (void)viewDidLoad
{
...
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(showPan)];
panGesture.delegate = self;
[appDelegate.mapView addGestureRecognizer:panGesture];
[panGesture release];
}
- (void)showPan
{
NSLog(#"pan!");
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
Then it works like a charm.

Answer 2

Swift 5
let panGesture = UIPanGestureRecognizer(target: self, action: #selector(panGesture))
panGesture.delegate = self
self.mapView.addGestureRecognizer(panGesture)
#objc func panGesture (sender: UIPanGestureRecognizer) {
}
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}