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POGoogle Maps iOS SDK: How do I get accurate latitude and longitude coordinates from a camera's visibleRegion?
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  1. POGoogle Maps iOS SDK: How do I get accurate latitude and longitude coordinates from a camera's visibleRegion?
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    copied!<p>EDIT: This is now a confirmed bug with <a href="https://code.google.com/p/gmaps-api-issues/issues/detail?id=5107" rel="nofollow noreferrer">this</a> SDK</p> <p>I'm using version 1.1.1.2311 of the Google Maps for iOS SDK, and I'm looking to find the bounding latitude and longitude coordinates for the visible map on screen.</p> <p>I'm using the following code to tell me what the current projection is:</p> <pre><code>NSLog(@"\n%@,%@\n%@,%@\n%@,%@\n%@,%@\n", [NSNumber numberWithDouble:mapView.projection.visibleRegion.farLeft.latitude], [NSNumber numberWithDouble:mapView.projection.visibleRegion.farLeft.longitude], [NSNumber numberWithDouble:mapView.projection.visibleRegion.farRight.latitude], [NSNumber numberWithDouble:mapView.projection.visibleRegion.farRight.longitude], [NSNumber numberWithDouble:mapView.projection.visibleRegion.nearLeft.latitude], [NSNumber numberWithDouble:mapView.projection.visibleRegion.nearLeft.longitude], [NSNumber numberWithDouble:mapView.projection.visibleRegion.nearRight.latitude], [NSNumber numberWithDouble:mapView.projection.visibleRegion.nearRight.longitude]); </code></pre> <p>From reading the headers, it seems that it may not be updated when the camera moves. Fair enough...</p> <pre><code>/** * The GMSProjection currently used by this GMSMapView. This is a snapshot of * the current projection, and will not automatically update when the camera * moves. The projection may be nil while the render is not running (if the map * is not yet part of your UI, or is part of a hidden UIViewController, or you * have called stopRendering). */ </code></pre> <p>But, it appears to update each time the delegate method is called, so I attempted to plot the coordinates to test them...</p> <p>For the following on my phone:</p> <p><img src="https://i.stack.imgur.com/sxoFI.png" alt="my app&#39;s current projection"></p> <p>The output of the NSLog from above gives me the following:</p> <pre><code>37.34209003645947,-122.0382353290915 37.34209003645947,-122.010769508779 37.30332095984257,-122.0382353290915 37.30332095984257,-122.010769508779 </code></pre> <p>When plotting those coordinates using <a href="http://www.darrinward.com/lat-long/" rel="nofollow noreferrer">this</a> I get a projection that seems off:</p> <p><img src="https://i.stack.imgur.com/R5rMX.png" alt="actual projection"></p> <p>These coordinates are consistent across app launches which leads me to believe that I'm either consistently doing something wrong, I'm misunderstanding what visibleRegion is, or I've discovered a bug. Anyone care to help me figure out which one it is?</p>
 

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