Custom Pin Image for MapKit Annotation - ios

Question

I want to use my Pin (not default).
I tried above code. First, I can see default pin. When I touched showMyLocation, after I touched sightLocation, default pin change with my custom pin. I want to show my custom pin in first view.
TOCGSightAnnotation.h
#interface TOCGSightAnnotation : NSObject <MKAnnotation>
#property (strong, nonatomic) NSString *title;
#property (nonatomic,assign) CLLocationCoordinate2D coordinate;
- (id)initWithCoordinate:(CLLocationCoordinate2D)coordinate title:(NSString *)title;
#end
TOCGSightAnnotation.m
#implementation TOCGSightAnnotation
- (id)initWithCoordinate:(CLLocationCoordinate2D)coordinate title:(NSString *)title
{
if ((self = [super init])) {
self.coordinate =coordinate;
self.title = title;
}
return self;
}
#end
TOCGSightseeingMapKitViewController.h
#interface TOCGSightseeingMapKitViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate>
#property (strong) NSNumber *latitude;
#property (strong) NSNumber *longitude;
#property (weak, nonatomic) IBOutlet MKMapView *mapView;
#property (strong, nonatomic) CLLocationManager * locationManager;
#end
TOCGSightseeingMapKitViewController.m
#import "TOCGSightseeingMapKitViewController.h"
#import "TOCGSightAnnotation.h"
CLLocationCoordinate2D sightCoordinate;
MKCoordinateRegion region;
#interface TOCGSightseeingMapKitViewController ()
#end
#implementation TOCGSightseeingMapKitViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
[self.locationManager startUpdatingLocation];
sightCoordinate = CLLocationCoordinate2DMake([self.latitude doubleValue], [self.longitude doubleValue]);
TOCGSightAnnotation *annotation = [[TOCGSightAnnotation alloc] initWithCoordinate:sightCoordinate title:#"Sight Title"];
[self.mapView addAnnotation:annotation];
region =
MKCoordinateRegionMakeWithDistance(sightCoordinate, 500, 500);
[self.mapView setRegion:region animated:YES];
}
- (IBAction)myLocation:(id)sender
{
self.mapView.delegate = self;
self.mapView.showsUserLocation = YES;
[self.mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
}
- (IBAction)sightLocation:(id)sender
{
[self.mapView setRegion:region animated:YES];
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView
viewForAnnotation:(id <MKAnnotation>)annotation
{
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil;
if ([annotation isKindOfClass:[TOCGSightAnnotation class]])
{
MKPinAnnotationView *pinView = (MKPinAnnotationView*)[mapView
dequeueReusableAnnotationViewWithIdentifier:#"CustomPinAnnotationView"];
if (!pinView)
{
pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation
reuseIdentifier:#"CustomPinAnnotationView"];
pinView.image = [UIImage imageNamed:#"mapIcon.png"];
pinView.pinColor = MKPinAnnotationColorRed;
pinView.animatesDrop = YES;
pinView.canShowCallout = YES;
}
else
pinView.annotation = annotation;
return pinView;
}
return nil;
}

Answer 1

The reason is simple. The method
- (MKAnnotationView *)mapView:(MKMapView *)mapView
viewForAnnotation:(id <MKAnnotation>)annotation
will get called only if you set the MKMapViewDelegate. As long as you didn't touch the button that calls the IBAction
- (IBAction)myLocation:(id)sender
the delegate is not set, so the delegate methods are not called. Try moving the line
self.mapView.delegate = self;
after your MKMapView allocation.

Answer 2

I tried this and it works.
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
[self.locationManager startUpdatingLocation];
}
- (void)viewDidAppear:(BOOL)animated
{
self.mapView.delegate = self;
sightCoordinate = CLLocationCoordinate2DMake([self.latitude doubleValue], [self.longitude doubleValue]);
TOCGSightAnnotation *annotation = [[TOCGSightAnnotation alloc] initWithCoordinate:sightCoordinate title:#"Sight Title"];
[self.mapView addAnnotation:annotation];
region =
MKCoordinateRegionMakeWithDistance(sightCoordinate, 500, 500);
[self.mapView setRegion:region animated:YES];
}