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POSlight zoom on MKCoordinateRegion?
 

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  1. POSlight zoom on MKCoordinateRegion?
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    <p>I am zooming an MKMapView to fit the bounding region of a collection of pins, however when the pins are displayed I have noticed that the zoom could ideally do with being a little tighter. My proposed solution to this was to make the region deltas slightly smaller:</p> <pre><code>// SMALL ZOOM region.span.latitudeDelta = (upper.latitude - lower.latitude) * 0.9; region.span.longitudeDelta = (upper.longitude - lower.longitude) * 0.9; </code></pre> <p>However I have noticed that fine adjustments don't seem to translate to a small zoom increase, is there some form of snapping on the zoom? Really small values work, as do really big ones, but just adjusting the region size by a few percent does not seem to work with the view nearly always jumping/zooming in to far and clipping my pins.</p> <h1>EDIT:</h1> <p>Quick tests showing the results of different scaling factors on the region:</p> <pre><code> // SCALE FACTOR // V region.span.latitudeDelta = (upper.latitude - lower.latitude) * 0.9; region.span.longitudeDelta = (upper.longitude - lower.longitude) * 0.9; </code></pre> <p>Here are the results:</p> <ul> <li>x0.5 region too small, some annotations off screen</li> <li>x0.6 Same as using 1.0</li> <li>x0.7 Same as using 1.0</li> <li>x0.8 Same as using 1.0</li> <li>x0.9 Same as using 1.0</li> <li>x1.0 Original fit</li> <li>x1.1 region too big, annotations too small on screen</li> </ul> <p>My point is that very small adjustments (e.g. 0.6 to 0.9) don't seem to make any difference.</p>
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    1. COIs your objective automatically zooming and panning to fit your annotations or doing this manually?
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    2. COI am placing the annotations on the map and then using MKCoordinateRegion region = MKCoordinateRegionMake(locationCenter, locationSpan); to fit then to the view. What I was truing to do was adjust the locationSpan slightly to get a slightly (i.e. 5%) tighter zoom.
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