MKAnnotationView not working properly - ios

Question

I'm trying to replace the MKAnnotationView image depending on an object value, the code is executed but the images are randomly assigned so they are not matched with the correct values.
- (MKAnnotationView *)mapView:(MKMapView *)mapview viewForAnnotation:(EventAnnotation *)annotation{
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil;
static NSString* AnnotationIdentifier = #"AnnotationIdentifier";
MKAnnotationView *annotationView = [mapview dequeueReusableAnnotationViewWithIdentifier:AnnotationIdentifier];
if(annotationView)
return annotationView;
else
{
MKAnnotationView *annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation
reuseIdentifier:AnnotationIdentifier];
annotationView.canShowCallout = YES;
annotationView.image = [self setImageByType:annotation];
annotationView.draggable = NO;
return annotationView;
}
return nil;
}
setImageByType method:
- (UIImage*)setImageByType:(EventAnnotation *)annotation{
//Set annotation image depending on its type
UIImage *image = [[UIImage alloc]init];
NSString *type = annotation.type;
if ([type isEqualToString:#"event"]) {
image = [UIImage imageNamed:#"geolocalization_events"];
}else if ([type isEqualToString:#"show"]){
image = [UIImage imageNamed:#"geolocalization_shows"];
}else if ([type isEqualToString:#"culture"]){
image = [UIImage imageNamed:#"geolocalization_culture"];
}else if ([type isEqualToString:#"eat"]){
image = [UIImage imageNamed:#"geolocalization_eat"];
}else if ([type isEqualToString:#"drink"]){
image = [UIImage imageNamed:#"geolocalization_drink"];
}else if ([type isEqualToString:#"cybercafe"]){
image = [UIImage imageNamed:#"geolocalization_cybercafe"];
}
UIImage *finalImage = [self imageWithImage:image scaledToSize:CGSizeMake(50, 50)];
return finalImage;
}
resize the image:
- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
//Resize annotation image
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
I would say the code is executed faster than the images are assigned to the views. Any ideas?

Answer 1

Option 1
Try changing this line:
static NSString* AnnotationIdentifier = #"AnnotationIdentifier";
To this:
NSString* AnnotationIdentifier = annotation.type;
Option 2:
After this line:
MKAnnotationView *annotationView = [mapview dequeueReusableAnnotationViewWithIdentifier:AnnotationIdentifier];
Add this line:
annotationView.image = [self setImageByType:annotation];