MapKit mapView: viewForAnnotation no tiene efecto sobre el color del pin

No puedo cambiar el color del pin.

Tengo mi controller de vista extender <MKMapViewDelegate> e implementar mapView:viewForAnnotation Estoy cerca pero debo faltar algo. Cualquier ayuda sería apreciada.

MainViewController.h

 #import <UIKit/UIKit.h> #import <MapKit/MapKit.h> #import "StopAnnotation.h" #define METERS_PER_MILE 1609.344 @interface MainViewController : UIViewController <MKMapViewDelegate> { } @property (weak, nonatomic) IBOutlet MKMapView *mapView; @end 

MapViewController.m

 #import "MainViewController.h" @implementation MainViewController @synthesize mapView=_mapView; - (void)viewWillAppear:(BOOL)animated { CLLocationCoordinate2D zoomLocation; zoomLocation.latitude = 43.066667; zoomLocation.longitude = -89.4; MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, METERS_PER_MILE, METERS_PER_MILE); MKCoordinateRegion adjustRegion = [_mapView regionThatFits:viewRegion]; [_mapView setRegion:adjustRegion animated:YES]; [_mapView addAnnotation:[[StopAnnotation alloc] initWithCoordinate:zoomLocation]]; } - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation { MKPinAnnotationView *pav = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:nil]; pav.pinColor = MKPinAnnotationColorPurple; return pav; } // the rest of the methods are default, ie viewDid* and shouldAutorotate*, etc... 

StopAnnotation.h

 #import <Foundation/Foundation.h> #import <MapKit/MapKit.h> @interface StopAnnotation : NSObject <MKAnnotation> { CLLocationCoordinate2D coordinate; NSString *title; NSString *subtitle; } - (id)initWithCoordinate:(CLLocationCoordinate2D)c; @end 

StopAnnotation.m

 #import "StopAnnotation.h" @implementation StopAnnotation @synthesize coordinate; - (NSString *)subtitle { return @"subtitle"; } - (NSString *)title { return @"title"; } - (id)initWithCoordinate:(CLLocationCoordinate2D)c { coordinate = c; NSLog(@"%f,%f", c.latitude, c.longitude); return self; } @end 

Estoy haciendo un ejercicio y el código fue principalmente de aquí

¡¡Gracias!!

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