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    <p>I have found this method to be extremely useful. All you need to do is call it and pass your <code>MKMapView</code> as the argument, and it will determine the best zoom level to fit all of your annotations. The "tightness" can be adjusted by modifying the constant multiplier on the commented lines (currently 1.1).</p> <p><a href="https://stackoverflow.com/questions/4169459/whats-the-best-way-to-zoom-out-and-fit-all-annotations-in-mapkit/4169474#4169474">What&#39;s the best way to zoom out and fit all annotations in MapKit</a></p> <pre><code>- (void)zoomToFitMapAnnotations:(MKMapView *)mapView { if ([mapView.annotations count] == 0) return; CLLocationCoordinate2D topLeftCoord; topLeftCoord.latitude = -90; topLeftCoord.longitude = 180; CLLocationCoordinate2D bottomRightCoord; bottomRightCoord.latitude = 90; bottomRightCoord.longitude = -180; for (MapAnnotation *annotation in mapView.annotations) { topLeftCoord.longitude = fmin(topLeftCoord.longitude, annotation.coordinate.longitude); topLeftCoord.latitude = fmax(topLeftCoord.latitude, annotation.coordinate.latitude); bottomRightCoord.longitude = fmax(bottomRightCoord.longitude, annotation.coordinate.longitude); bottomRightCoord.latitude = fmin(bottomRightCoord.latitude, annotation.coordinate.latitude); } MKCoordinateRegion region; region.center.latitude = topLeftCoord.latitude - (topLeftCoord.latitude - bottomRightCoord.latitude) * 0.5; region.center.longitude = topLeftCoord.longitude + (bottomRightCoord.longitude - topLeftCoord.longitude) * 0.5; region.span.latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * 1.1; // Add a little extra space on the sides region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * 1.1; // Add a little extra space on the sides region = [mapView regionThatFits:region]; [mapView setRegion:region animated:YES]; } </code></pre>
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    1. POSlight zoom on MKCoordinateRegion?
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    1. USEvan Mulawski
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    1. COHi Evan, thats pretty much what I have been doing in my own routine. I did miss "regionThatFits" but I have just added that and it seems to make no difference. My problem is that using small multipliers (to tighten the region) like x0.6, x0.7, x0.8, x0.9 which should all shrink the region about its center all produce the same result. x1.0 is too far out, x0.9 is too far in there does not seem to be a happy medium.
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    2. COHave you tried to adjust the 1.1x multiplier on the commented lines? This should produce a small zooming effect.
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    3. COThe 1.1x multiplier is what I have been changing. 1.1 is doing a pullback, making the region bigger and giving more space at the sides. What I want is a pushin/zoom, making the region smaller so the region fills the screen tighter.
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