Use UIScreenEdgePanGestureRecognizer without moving MKMapView

Question

I have a UIViewController containing a MKMapView (in fact, it contains a full screen container containing the MKMapView, but it shouldn't have any impact)

I implemented a UIScreenEdgePanGestureRecognizer (to show a drawer) like this:

self.swipeRight = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(handleEdgeGesture:)];
[self.swipeRight setEdges:UIRectEdgeLeft];
[self.swipeRight setDelegate:self];
[self.view addGestureRecognizer:self.swipeRight];

and to make it works I had to add the following method (returning YES):

(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;

But then the map is moving at the same time as the drawer is appearing! I've tried all kind of tricks to prevent it but was not able to... (I tried shouldBeRequiredToFailByGestureRecognizeror requireGestureRecognizerToFail for example)

Any idea how I could prevent the MapView from moving when the gesture is a ScreenEdgePan from LeftEdge?

I believe this should answer your question: http://stackoverflow.com/a/11954355/1244184 — Jonathon Hibbard, Jul 21 '14 at 06:53
Have you tried adding the gesture recogniser to the map view instead of the container? - just a hunch — Warren Burton, Jul 21 '14 at 07:01
@JonathonHibbard: I saw that, but no.. it means moving the map myself instead of letting the mapview do it, and it's awful in term of perf — Sebastien C., Jul 21 '14 at 08:25
@WarrenBurton: It's not an option... But I tried for the test, and it was the same — Sebastien C., Jul 21 '14 at 08:25
Dang that sucks - i'll check later on tonight if i can find anything else for ya. i know i've seen this problem before — Jonathon Hibbard, Jul 21 '14 at 19:06

score 16 · Answer 1 · answered Jul 22 '14 at 12:11

What I did in my app was the following:

UIScreenEdgePanGestureRecognizer *popRecognizer = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePopRecognizer:)];
popRecognizer.edges = UIRectEdgeLeft;
popRecognizer.delegate = self;

Then set the delegate to YES as you said

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

And enable/disable scrolling of the mapview like this

- (void)handlePopRecognizer:(UIScreenEdgePanGestureRecognizer*)recognizer
{
    if(recognizer.state == UIGestureRecognizerStateBegan){
        _mapView.scrollEnabled = NO;
    } else if(recognizer.state == UIGestureRecognizerStateEnded || recognizer.state == UIGestureRecognizerStateCancelled){
        _mapView.scrollEnabled = YES;

    }
}

Hope it helps.

Hi thanks, I didn't had this idea, I'm going to try... The only issue is that I don't have access to the mapView as it's in a container view, so I'll have to use a notification. I'll try and tell you! — Sebastien C., Jul 22 '14 at 17:00

score 3 · Answer 2 · answered Jul 22 '14 at 13:32

3

The pan gesture on the map needs to be cancelled as soon as the UIScreenEdgePanGestureRecognizer begins to recognize. To achieve this it is sufficient to set scrollEnabled to NO momentarily. This will cancel the other gesture recognizer.

- (void) handleEdgeGesture:(UIScreenEdgePanGestureRecognizer*)recognizer
{
    if(recognizer.state == UIGestureRecognizerStateBegan) {
        // cancel simultaneous gesture on map view
        _mapView.scrollEnabled = NO;
        _mapView.scrollEnabled = YES;
    }
}

answered Jul 22 '14 at 13:32

Felix

35,354
13
96
143

Thanks @phix23, as I said to Cedrick it's a really cool idea, I'll test it asap, even if I don't have direct access to the mapView – Sebastien C. Jul 22 '14 at 17:02
Why can't you just expose the mapview from the container? – Cedrick Jul 23 '14 at 11:15
The container let the user switch between a map view and a listview, so I have a container with 2 custom segues forwarding to 2 controllerView (I can't have 2 embed segue): so I can't directly expose the mapview to the container (I only have access to the mapview in the performSegue method). I just have to finish my actual git branch to test your solutions! – Sebastien C. Jul 25 '14 at 14:26
Thanks to both of you, it works! As Cedrick answered first I'm going to give him the bounty – Sebastien C. Jul 26 '14 at 09:12
This worked perfectly! thanks so much. I added a check to see if scrolling was enabled first before temporarily disabling it & enabling again. that way if it was already disabled, you won't risk enabling scrolling when you didn't intend to. – Natalia Dec 14 '16 at 00:19

score 2 · Answer 3 · answered Dec 24 '15 at 04:25

The following combination worked for me without touching the map view.

// This is to ensure UIScreenEdgePanGestureRecognizer won't be blocked by other gestures. 
// You may need to do some logic checking before returning YES.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
  return YES;
}
// This is to prevent other recognisers when UIScreenEdgePanGestureRecognizer
// is recognising the gesture. Again, you may want to do some logic checking
// before returning to YES.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{

  return YES;
}

score 1 · Answer 4 · answered Jul 25 '14 at 09:44

1

- (void) handleEdgeGesture:(UIScreenEdgePanGestureRecognizer*)recognizer : (id)sender
{
    if(recognizer.state == UIGestureRecognizerStateBegan && sender == GMSMapView) {
        // cancel simultaneous gesture on map view
        _mapView.isUserInteractionEnabled = NO;
    }
}

answered Jul 25 '14 at 09:44

2

It's pretty much the same solution, btw 'isUserInteractionEnabled' can't be set, thats the getter. You should use 'userInteractionEnabled'. – Cedrick Jul 25 '14 at 09:59

score 1 · Answer 5 · answered Jul 28 '14 at 06:56

1

I believe that the quickest solution is to make a thin view (with transparent background color) on top of mapView, where your gesture should not work on mapView. i.e. enter image description here

answered Jul 28 '14 at 06:56

arturdev

10,884
2
39
67

1

Hello @arturdev! Well, that's what I did before asking here :) and I didn't like it at all... because I do need to have a sufficient width to make it works and then it's annoying because sometime I just want to drag the map and it opens the drawer... It feels more like a hack – Sebastien C. Jul 28 '14 at 13:43

Use UIScreenEdgePanGestureRecognizer without moving MKMapView

5 Answers5

Linked