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find MKCoordinateRegion with multiple annotations

/ Published in: Objective C
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  1. -(void)zoomToFitMapAnnotations:(MKMapView*)mapView
  2. {
  3.     if([mapView.annotations count] == 0)
  4.         return;
  5.  
  6.     CLLocationCoordinate2D topLeftCoord;
  7.     topLeftCoord.latitude = -90;
  8.     topLeftCoord.longitude = 180;
  9.  
  10.     CLLocationCoordinate2D bottomRightCoord;
  11.     bottomRightCoord.latitude = 90;
  12.     bottomRightCoord.longitude = -180;
  13.  
  14.     for(MapAnnotation* annotation in mapView.annotations)
  15.     {
  16.         topLeftCoord.longitude = fmin(topLeftCoord.longitude, annotation.coordinate.longitude);
  17.         topLeftCoord.latitude = fmax(topLeftCoord.latitude, annotation.coordinate.latitude);
  18.  
  19.         bottomRightCoord.longitude = fmax(bottomRightCoord.longitude, annotation.coordinate.longitude);
  20.         bottomRightCoord.latitude = fmin(bottomRightCoord.latitude, annotation.coordinate.latitude);
  21.     }
  22.  
  23.     MKCoordinateRegion region;
  24.     region.center.latitude = topLeftCoord.latitude - (topLeftCoord.latitude - bottomRightCoord.latitude) * 0.5;
  25.     region.center.longitude = topLeftCoord.longitude + (bottomRightCoord.longitude - topLeftCoord.longitude) * 0.5;
  26.     region.span.latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * 1.1; // Add a little extra space on the sides
  27.     region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * 1.1; // Add a little extra space on the sides
  28.  
  29.     region = [mapView regionThatFits:region];
  30.     [mapView setRegion:region animated:YES];
  31. }

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