CODEWITHSUNDEEP
iosobjective-cmkmapview
Eng Mustafa W
Eng Mustafa W

Reputation: 55

MapKit Xcode programming

when i write this method :

-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    MKPinAnnotationView *view =[self.mapView dequeueReusableAnnotationViewWithIdentifier:@"pin"];

    if (view == nil) {
        view =[[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"pin"];
    }
}

there is warning on my *view object.."Incompatible pointer types initialising MKPinAnnotationView * with an expression of type MKAnnotationView * "

what is the solution for this please

Upvotes: 2

Views: 133

Answers (1)

FreeNickname
FreeNickname

Reputation: 7764

If you are sure that you'll get a correct type of annotation using dequeue, than you can cast types simply like this:

MKPinAnnotationView *view = (MKPinAnnotationView *) [self.mapView dequeueReusableAnnotationViewWithIdentifier:@"pin"];

The point is that dequeueReusableAnnotationViewWithIdentifier returns id type which can be a pointer to any object. So the compiler warns you that types MKPinAnnotationView * and id might be incompatible.

Upvotes: 2

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