Zoom MKMapview to closest two MKAnnotations for current user location

问题

What is the best way to zoom an MKMapview to closest two or three MKAnnotations for current user location?

I have a list of GPS coordinates (328 to be precise) loaded from a plist, every point is an annotation on the map. I'd like to limit the view to the two nearest annotation points around the user's current location.

回答1:

Roughly, the steps would be:

1. Find current location, convert to MKMapPoint
2. Iterate your list of annotations, using MKMetersBetweenMapPoints to find distance from current location
3. Save 2 or 3 smallest distances
4. Use the largest of these three distances to make a region using MKCoordinateRegionMakeWithDistance
5. Center the map on current location
6. Zoom to the region using [mapView setRegion:region animated:TRUE]

来源：https://stackoverflow.com/questions/12412379/zoom-mkmapview-to-closest-two-mkannotations-for-current-user-location