Animating an MKOverlayView

Question

I have an MKOverlayView that displays animated radar data as a series of images. The issue I have is that the radar images are chopped into tiles by MapKit. To swap images I have a timer that calls an update function which sets the current image in my overlay and then calls the following

[myRadarOverlayView setNeedsDisplayInMapRect:self.mapView.visibleMapRect];

The overlay updates, but does so one tile at a time so I get a choppy animation. Any ideas about how make all the tiles animate (i.e. swap images) at the exact same time?

Did you ever figure out a goodf way to do this? – Ross Kimes May 23 '11 at 15:58 — Ross Kimes, May 23 '11 at 15:58

score 6 · Accepted Answer · answered Jul 05 '11 at 18:13

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I solved this by adding a UIImageView as a subview of the MKOverlayView.

To animate, stop drawing with the normal drawMapRect:zoomScale:inContext: (via an instance variable/property flag) and draw to the UIImageView instead (to the animationImages property), then use startAnimating.
You can handle panning and zooming by reinitializing the UIImageView in response to mapView:regionDidChangeAnimated:.

answered Jul 05 '11 at 18:13

shawkinaw

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I'm banging my head on this one too, do you have some sample code to share? I think I'm not setting the frame/bounds right causing the UIImageView not to be shown. – botteaap Dec 30 '11 at 14:53
I was able to use this code here: https://github.com/yickhong/YHMapDemo and this code here: http://code.google.com/p/sugartin-info/downloads/detail?name=RadarOverLay.zip&can=2&q combined together to get the result described in this answer. – sridvijay Dec 29 '12 at 03:34
@shawkinaw Could you offer some advice on my question about animating in overlays for map view http://stackoverflow.com/questions/20558591/animated-gif-not-working-in-mkmapview-overlay-using-mkoverlayrenderer?noredirect=1#comment30789828_20558591? – wigging Dec 18 '13 at 04:47
I have tried both of the links @Gavin and also from sridvijay and got radar image appears here but still it takes time to load approx 15-20 secs and got this warning ": CoreAnimation: warning, deleted thread with uncommitted CATransaction; set CA_DEBUG_TRANSACTIONS=1 in environment to log backtraces.". Any help will be greatly appreciated – Harsh Thakur Apr 10 '15 at 11:42

score 4 · Answer 2 · answered May 20 '12 at 15:55

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Sample code how to animate a circle:

http://yickhong-ios.blogspot.com/2012/04/animated-circle-on-mkmapview.html

answered May 20 '12 at 15:55

Shmidt

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score 0 · Answer 3 · answered Apr 26 '11 at 18:22

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Is there a callback when all the tiles have finished loading? If so, you could go with double buffering, and update the view offscreen, and then switch it in.

answered Apr 26 '11 at 18:22

Snips

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Animating an MKOverlayView

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