Wrong region when map view is subclassed - ios

Question

If I subclass mkmapview I am unable to programmatically zoom in to the full extent. If I do not subclass, zooming works as expected.
My mkmapview subclass:
MyMapView.h
#import <MapKit/MapKit.h>
#interface MyMapView : MKMapView {
}
-(id)initWithLocation:(NSInteger)location;
#end
MyMapView.m
#import "MyMapView.h"
#implementation MyMapView
-(id)initWithLocation:(NSInteger)location; {
self = [super init];
if (self) {
}
return self;
}
my viewcontroller.m:
MyMapView *theMap = [[MyMapView alloc] initWithLocation:0];
theMap.frame = CGRectMake(0, 0, 320, 320);
[self.view addSubview:theMap];
float lat = 33.78;
float lon = -84.56;
CLLocationCoordinate2D newCenter = CLLocationCoordinate2DMake(lat, lon);
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance (newCenter, 10, 10);
[theMap setRegion:region animated:YES];
The resulting map view region is zoomed out much farther than I want. I know the 10 meters is probably tighter than can fit, but I expect the map to be zoomed in as tightly as it can. After the map finishes zooming, I can still manually zoom in 2 more levels.
I could fix the whole thing by including all the code in my main view controller, but I want to abstract the map a bit and keep my viewcontroller.m file cleaner and smaller.
What stupid mistake am I doing?

Answer 1

According to Apple's documentation, you should not subclass MKMapView.
Although you should not subclass the MKMapView class itself, you can get information about the map view’s behavior by providing a delegate object.