joeldrotleff · November 19, 2013 21:54 · Nov 19, 2013
diff --git a/MKMapView+Utilities.m b/MKMapView+Utilities.m
@@ -0,0 +1,27 @@
+//
+// Created by Joel Drotleff on 11/19/13.
+// Copyright (c) 2013 Joel Drotleff. All rights reserved.
+//
+
+
+#import <MapKit/MapKit.h>
+#import <CoreLocation/CoreLocation.h>
+#import "MKMapView+Utilities.h"
+
+
+@implementation MKMapView (Utilities)
+
+- (CLLocationDistance)getRadius
+{
+    // init center location from center coordinate
+    CLLocation *centerLocation = [[CLLocation alloc] initWithLatitude:self.centerCoordinate.latitude
+                                                            longitude:self.centerCoordinate.longitude];
+    double topCenterLat = centerLocation.coordinate.latitude-self.region.span.latitudeDelta/2.;
+    CLLocation *topCenterLocation = [[CLLocation alloc] initWithLatitude:topCenterLat
+                                                             longitude:centerLocation.coordinate.longitude];
+
+    CLLocationDistance distance = [centerLocation distanceFromLocation:topCenterLocation];
+    return distance;
+}
+
+@end