MapView not showing location and Pins? - ios

Question

Im working on a mapview but Its not showing the user location like I want and also the Pins, I dont know if the code is correct, I think it is, so I need your help.
Heres the code for showing the location with a zoom:
- (void)viewDidLoad
{
self.MapView.showsUserLocation = YES;
[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
coordinateuser.latitude = self.MapView.userLocation.coordinate.latitude;
coordinateuser.longitude = self.MapView.userLocation.coordinate.longitude;
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(coordinateuser, 1200, 1200);
double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
[self.MapView setRegion:region animated:YES];
});
[super viewDidLoad];
}
And heres the code for displaying a MKPinAnnotationView, this is the one that I think is wrong:
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation{
static NSString *SFAnnotationIdentifier = #"SFAnnotationIdentifier";
MKPinAnnotationView *pinView =
(MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:SFAnnotationIdentifier];
if (!pinView)
{
MKAnnotationView *annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:SFAnnotationIdentifier];
return annotationView;
}
else
{
pinView.annotation = annotation;
}
cmtlocation = CLLocationCoordinate2DMake(19.502519,-99.259779);
//UIImage *flagImage = [UIImage imageNamed:#"flag.png"];
//annotationView.image = flagImage;
[annotation setCoordinate:cmtlocation];
return pinView;
}
So I will appreciate your help! Thanks!

Answer 1

Actually, it's the other way around than what the other answer says:
If the dequeue returns nil, code is creating an empty MKAnnotationView.
MKAnnotationView is empty by default so the annotations (including the user location) are invisible. At the top of viewForAnnotation, check if annotation is of type MKUserLocation and return nil. For other annotations, create an MKAnnotationView if you want to use a custom image. Otherwise, create (alloc+init) an MKPinAnnotationView which automatically provides a pin image.
Additionally...
You are not even calling addAnnotation for your custom annotation. You should not be setting the annotation's coordinate in the viewForAnnotation method. Instead, you should be creating an annotation object (eg. in viewDidLoad), setting its coordinate and title and then calling addAnnotation.
Also, in viewDidLoad, you are trying to access the user location coordinates immediately after setting showsUserLocation to YES. The user location will not be available immediately. Instead, move the setRegion call to the didUpdateUserLocation delegate method (or just set userTrackingMode to MKUserTrackingModeFollow).

Answer 2

I think your code is wrong, as you expected: If
MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:SFAnnotationIdentifier];
does not return nil, you return just another annotation view:
MKAnnotationView *annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:SFAnnotationIdentifier];
return annotationView;
Otherwise, you try to set a property of a nil object:
pinView.annotation = annotation;
and then do something else before returning nil:
cmtlocation = CLLocationCoordinate2DMake(19.502519,-99.259779);
//UIImage *flagImage = [UIImage imageNamed:#"flag.png"];
//annotationView.image = flagImage;
[annotation setCoordinate:cmtlocation];
return pinView;