MapView的注释

Question

我已经在注释视图中添加图像，当我接触注释查看其照片量变到质变为红脚任何一个可以告诉我什么是他的原因吧

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation 
{ 
    MKPinAnnotationView* newAnnotation = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"annotation1"]; 

    if (annotation == _mapView.userLocation) 
    { 
     newAnnotation.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; 
     return nil; 
    } 

    //[newAnnotation setSelected:YES]; 
    newAnnotation.image = [UIImage imageNamed:@"sample.png"]; 
    newAnnotation.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; 
    newAnnotation.canShowCallout = YES; 
    [newAnnotation retain]; 

    return newAnnotation; 

} 

Answer 1

充分利用newAnnotation一个MKAnnotationView而比一个MKPinAnnotationView。