Vanishing annotations

[jpmhouston]

In my app I've seen instances where cluster annotations vanish incorrectly. I think it most often happens when moving some annotations off-screen, zooming in the map somewhat, then moving to make those annotations on-screen again. The correct annotations are present while panning the map, but sometimes disappear after the drag stops.

I tried debugging TSClusterOperation, but it made my head hurt.

I think I've found a work-around that seems make the annotations re-appear immediately after they've vanished. In mapView:regionDidChangeAnimated: I added:

// make extra call to layout clusters shortly after panning stops
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(RefreshClustersAfterPanDelay * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    [self.mapView needsRefresh];
});

I found it difficult to reproduce with a small number of annotations, somewhat easier when there's hundreds. I could potentially provide an app and a data set that might help.

[ashare80]

@jpmhouston If you have something mocked up that easily reproduces the problem I can take a look otherwise it is pretty hard to tell. Sounds like annotations are getting marked as off screen that aren't actually off screen.

[jpmhouston]

don't have a mockup, but i can send you the whole app i was working on for my client :-O. i can disable the delayed needsRefresh call & tell you where to scroll to on the map to find test data that should show the problem

[ashare80]

Sure that works I'll take a look.

[bsoyluoglu]

Having the same issue @jpmhouston work around works like a charm.

[vjerryv]

i got the same issue.