MapKit Annotations not showing up on map

Question

I'm having trouble getting the MKAnnotationViews show up on the map in MapKit. I'm using iOS 7, and have now searched the forums and the web for many hours, trying different samples and setups.

Below I have the most basic setup possible (I think) to make it work. The app contains a single ViewController with a toolbar with a button on top, and the rest is the MapView. The button triggers the method zoomToUser:(UIBarButtonItem*)sender. Right-clicking and checking my outlets and delegates seem to be correct. I have some NSLog-statements being triggered to output some debug info.

First the VC:

#import "ViewController.h"
#import "Data.h"

@interface ViewController () 
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
- (IBAction)zoomToUser:(UIBarButtonItem *)sender;
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.mapView.showsUserLocation = YES;
    Data *ann = [[Data alloc] init];
    [self.mapView addAnnotation:ann];
}

-(void)viewDidAppear:(BOOL)animated
{
        [super viewDidAppear:animated];
        [self zoomToUser:nil];
    }

-(IBAction)zoomToUser:(UIBarButtonItem *)sender
{
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(self.mapView.userLocation.coordinate, 2000, 2000);
    NSLog(@"region: %f x %f",self.mapView.userLocation.coordinate.latitude,self.mapView.userLocation.coordinate.longitude);
    [self.mapView setRegion:region animated:YES ];
    NSArray *arr = self.mapView.annotations;
    for(int i = 0, max = arr.count; i < max; i++)
    {
        id annotation = arr[i];
        NSLog(@"%d of %d: %@ (%@)",i+1,max,annotation.title, [annotation class]);
    }
}

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id ) annotation
{
    NSString *reuseId = @"Test";
    if([annotation isKindOfClass:[MKUserLocation class]])
    {
        return nil;
    }
    else if( [annotation isKindOfClass:[Data class]])
    {
        MKAnnotationView *annov = [mapView    dequeueReusableAnnotationViewWithIdentifier:reuseId];
        if(!annov)
        {
            annov = [[MKAnnotationView alloc]initWithAnnotation:annotation
                                                reuseIdentifier:reuseId];
        }
        else
        {
            annov.annotation = annotation;
        }
        annov.canShowCallout = YES;
        NSLog(@"Title: %@",annotation.title);
        return annov;
    }
    else
    {
        return nil;
    }
}
@end

And the Data class:

#import "Data.h"

@implementation Data

-(NSString *)title
{
    return @"The title";
}

-(NSString *)subtitle
{
    return @"A subtitle";
}

-(CLLocationCoordinate2D)coordinate
{
    CLLocationCoordinate2D coordinate;
    coordinate.latitude = 60.123456;
    coordinate.longitude = 10.123456;
    return coordinate;
}

@end

The Data.h:

#import 
#import 

@interface Data : NSObject 

@end

And the ViewController.h:

#import 
#import 

@interface ViewController : UIViewController

@end

As you can see the viewForAnnotation-method prints the annotations title in console when it's requested, and each time the map pans the area, it prints.

Pressing the BarButton and triggering the zoomToUser:-method logs to console that the map indeed has two annotations, the MKUserLocation and the one I added.

How come my MapView tells me it has the annotation, it asks for the view, it gets the view, but it does not show it?

MapKit Annotations not showing up on map

1 Answers