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Detect Map Pan/Zoom based on User's Touch/Pinch

AaronConnolly

Hello,

Is it possible with the SDK to discern the difference between programmatically panning/zooming the map and one actually touching and pinching the map?

I need to be able to tell the difference with my app.

1. Listening for the 'MapDidEndPanning' and 'MapDidEndZooming' event does not tell you whether or not the user panned/zoomed the map or whether or not you did so programmatically.
2. AGSMapViewTouchDelegate only provides methods for click, tap + hold, tap + hold + release, and tap + hold + move.

Thanks,
- Aaron

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Accepted answers

NimeshJarecha

Any word from you guys (ESRI) as to whether hooking up gesture recognizers is recommended or not?

No, it is not recommended to hooking up gesture recognizers. If you do so then it'll interfere the functionality of map. In current SDK, there is no easy way to differentiate between programmatically panning/zooming the map and one actually touching and pinching the map. However, the next version of the SDK will have that functionality.

Regards,
Nimesh

All comments

AaronConnolly

I'm thinking I'm going to have to hook up my own gesture recognizer for both panning and pinching. Has anyone else faced this problem?

AaronConnolly

Piece of cake:

In view did load:

// Add gesture recognizers to map view
UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(mapPannedByTouch];
UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(mapPinchedByTouch];
    
[self.mapView addGestureRecognizer:panGestureRecognizer];
[self.mapView addGestureRecognizer:pinchGestureRecognizer];

Then:

- (void)mapPannedByTouch:(UIGestureRecognizer*)gestureRecognizer {
    
    NSLog(@map panned by touch!);
}

- (void)mapPinchedByTouch:(UIGestureRecognizer*)gestureRecognizer {
    
    NSLog(@map pinched by touch!);
}

AaronConnolly

After hooking up these gesture recognizers I notice that the map doesn't pan but a little bit after each pan. It looks like it might be conflicting with some of the map's default functionality.

Any word from you guys (ESRI) as to whether hooking up gesture recognizers is recommended or not?

Thanks,
- Aaron

AaronConnolly

Hey guys,

I noticed that if you add the gesture recognizer code to the MapViewDemo project the map doesn't work. You can't pan or zoom the map afterward. Why is that? Incidentally I found this post that describes how to bubble touch events up from the map. Does this work? If so, why can't we use gesture recognizers instead?

http://forums.arcgis.com/threads/38228-How-to-catch-AGSMapView-touch-gestures

Thanks,
- Aaron

AaronConnolly

After further investigation it seems you have to subclass AGSMapView and implement the touchesEnded event to do this. It is not clear, why, the gesture recognizers disable the map? Can we get clarification there?

NimeshJarecha

Any word from you guys (ESRI) as to whether hooking up gesture recognizers is recommended or not?

AaronConnolly

No, it is not recommended to hooking up gesture recognizers. If you do so then it'll interfere the functionality of map. In current SDK, there is no easy way to differentiate between programmatically panning/zooming the map and one actually touching and pinching the map. However, the next version of the SDK will have that functionality.

Regards,
Nimesh

Got it. Thanks Nimesh.

FrankLin1

By the way , when can we meet next version of the SDK ?

Frank

NimeshJarecha

The new version of ArcGIS SDK for iOS is available now.

Regards,
Nimesh

JasonGambacort

The new version of ArcGIS SDK for iOS is available now.

Regards,
Nimesh

Hi Nimesh...

What about pinch zoom functionality for touch screen Windows 7 tablets? Will ArcReader for this environment eventually support pinch zooming?

Jason

NimeshJarecha

Jason,

This forum is for ArcGIS Runtime SDK for iOS. If you have question about ArcReader then please post your question in ArcReader forum.

Regards,
Nimesh

PatrickTruitt

This question is not answered. I've been developing to the latest API for iOS and I still don't see a delegate function that fires on user touch pan and zoom. Basic stuff to know the user's interactions here. Clicking or tap and hold gives me nothing. Unless I'm missing something.

NimeshJarecha

There is an interacting flag on AGSMapView for you to determine whether interaction with map is by user or not.

Interacting: Whether the map is currently being dragged, pinched, rotated or scrolled by the user.

Hope this helps!

Regards,

Nimesh

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