Uses Google Maps SDK for iOS 1.7
[https://developers.google.com/maps/documentation/ios/]To track when user has ended a tap the only method in the sdk was idleAtCameraPosition. I was using this to trigger a 1 second timer to recalc clusters. When timer fired I iterated over a tree of markers and calculated which where visible and clustered them.
But I noticed that idleAtCameraPosition was being triggered even when finger still on the device so cluster redraw happening too early and caused stuttering.
Also if you swipe the map with a large swipe and let go. The idleAtCameraPosition is called till map stops panning even though finger let go.
- So I subclass GSMMapView > SNGSMapView
- Added a PanGesture Recognizer
- If State = ENDED then call delegate
- In View Controller in delegate I fire 0.5 sec timer
- When fired I then redraw the clusters.
- I use a timer so that clustering isnt triggered if user ends tap suddenly.
Code sample doesnt include clustering its just to show a Pan gesture on top of GSMMapView And a better way to track when tap ended.
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if you do a large swipe and let go the pan gestire >> ENDED is called
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but actual projection of the map isnt correct till idleAtCameraPosition finishes.
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So if youre calculating clusters this may be an issue.
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But would have to be a huge swipe for this to be an issue.
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You can also still use idleAtCameraPosition to store camera. position/zoom
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When 1 sec timer fires on Pan Gesture map may have stopped moving.
TIP: shouldRecognizeSimultaneouslyWithGestureRecognizer should return YES Default is no and if left at NO the GSMMapView gets the Pan Gesture and our subclass handler is never triggered
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
//default is no - if we dont set it to on then gesture is captured by GMSMapView and myGestureHandler never called
return YES;
}