Zoom MKMapView to fit polyline points

Question

I have an array, allCollections, that holds programmatically-created arrays of CLLocations the user has recorded through my iOS app. Each sub-array in allCollections holds a

Answer 1

You could loop through all CLLocations recording the max/min coordinates and use that to set a view rect like they do on this question iOS MKMapView zoom to show all markers .

Or you could go through each of your overlays and get their boundingMapRect then use MKMapRectUnion (http://developer.apple.com/library/ios/documentation/MapKit/Reference/MapKitFunctionsReference/Reference/reference.html#//apple_ref/c/func/MKMapRectUnion) to combine them all until you have one MKMapRect that covers them all and use that to set the view.

[mapView setVisibleMapRect:zoomRect animated:YES]

This question shows a simple loop combining the maprects in unions as I suggested: MKMapRect zooms too much