Using MKOverlayRenderer in iOS7 to display UIImage - ios

Question

I am trying to display a UIImage as a overlay for a map-based iPad application. I attempted to follow the 4 steps to setting a custom overlay defined in Apple's documentation: define the overlay data object, define the object renderer, implement the map view in map view delegate, and add overlay data object to to map view. After attempting to do all these, there is no overlay when I run the simulator. Any advice would be fantastic. My code is as follows
ViewController.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#import "bjorkOverlay.h"
#import "bjorkOverlayRenderer.h"
#interface TUTViewController : UIViewController <MKMapViewDelegate>
{
CLLocationManager *locationManager;
CLLocation *location;
}
#property (strong, nonatomic) IBOutlet MKMapView *mapView;
#property(nonatomic) MKCoordinateRegion region;
#property (nonatomic, readonly) MKMapRect boundingMapRect;
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
#property (nonatomic, readonly) CLLocationCoordinate2D bjorkOverlayCenterPoint;
#property (nonatomic, readonly) MKMapRect bjorkOverlayBoundingMapRect;
#end
ViewController.m
#import "TUTViewController.h"
#import "bjorkOverlay.h"
#import "bjorkOverlayRenderer.h"
#import MapKit;
#interface TUTViewController () <MKMapViewDelegate>
#end
#implementation TUTViewController
- (void)viewDidLoad
{
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
[locationManager startUpdatingLocation];
_mapView.showsUserLocation = YES;
_mapView.delegate = self;
CLLocationCoordinate2D lowerLeftCoord = CLLocationCoordinate2DMake( 45.022943 ,-87.146606);
MKMapPoint lowerLeft = MKMapPointForCoordinate(lowerLeftCoord);
CLLocationCoordinate2D upperRightCoord = CLLocationCoordinate2DMake( 45.048513, -87.124765);
MKMapPoint upperRight = MKMapPointForCoordinate(upperRightCoord);
MKMapRect mapRect = MKMapRectMake(lowerLeft.x, upperRight.y, upperRight.x - lowerLeft.x, lowerLeft.y - upperRight.y);
[self.mapView setVisibleMapRect:mapRect animated:YES];
bjorkOverlay * mapOverlay = [[bjorkOverlay alloc] init];
[_mapView addOverlay:mapOverlay];
}
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay: (id<MKOverlay>)overlay {
MKOverlayRenderer *mapOverlay = [[MKOverlayRenderer alloc] init];
return mapOverlay;
}
// Do any additional setup after loading the view, typically from a nib.
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
bjorkOverlay.h
#import <Foundation/Foundation.h>
#import MapKit;
#interface bjorkOverlay : NSObject <MKOverlay>
+ (id)overlayWithCoordinate:(CLLocationCoordinate2D)coordinate;
#property (nonatomic, assign) CLLocationCoordinate2D bjorkOverlayCenterPoint;
#property (nonatomic) MKMapRect bjorkOverlayBoundingMapRect;
#end
bjorkOverlay.m
#import "bjorkOverlay.h"
#import MapKit;
#implementation bjorkOverlay
+ (id)overlayWithCoordinate:(CLLocationCoordinate2D)coordinate radius:(CLLocationDistance)radius{
bjorkOverlay* overlay = [[bjorkOverlay alloc] init];
overlay.coordinate = coordinate;
return overlay;
}
-(MKMapRect)boundingMapRect{
CLLocationCoordinate2D lowerLeftCoord = CLLocationCoordinate2DMake( 45.022943 ,-87.146606);
MKMapPoint lowerLeft = MKMapPointForCoordinate(lowerLeftCoord);
CLLocationCoordinate2D upperRightCoord = CLLocationCoordinate2DMake( 45.048513, -87.124765);
MKMapPoint upperRight = MKMapPointForCoordinate(upperRightCoord);
MKMapRect mapRect = MKMapRectMake(lowerLeft.x, upperRight.y, upperRight.x - lowerLeft.x, lowerLeft.y - upperRight.y);
return mapRect;
}
- (CLLocationCoordinate2D)bjorkOverlayCenterPoint
{
CLLocationCoordinate2D coord1 = {
45.035728,-87.1356855
};
return coord1;
}
#end
bjorkOverlayRenderer.h
#import <MapKit/MapKit.h>
#interface bjorkOverlayRenderer : MKOverlayRenderer
#end
bjorkOverlayRender.m
#import "bjorkOverlayRenderer.h"
#implementation bjorkOverlayRenderer
- (void)drawMapRect:(MKMapRect)mapRect
zoomScale:(MKZoomScale)zoomScale
inContext:(CGContextRef)ctx
{
UIImage *image = [UIImage imageNamed:#"overlay.png"];
CGImageRef imageReference = image.CGImage;
MKMapRect theMapRect = [self.overlay boundingMapRect];
CGRect theRect = [self rectForMapRect:theMapRect];
CGRect clipRect = [self rectForMapRect:mapRect];
CGContextAddRect(ctx, clipRect);
CGContextClip(ctx);
CGContextDrawImage(ctx, theRect, imageReference);
}
#end
Any advice would be great or if you have seen sample code for MKOverlayRenderer I would appreciate a link. Thanks