Why does a custom MKMapView annotation image disappear on touch? - iphone

Question

I am annotating my map and setting an image just fine, but when I tap the annotation on the MapView, the image goes from my custom image back to the red pin. Why is this?
- (MKAnnotationView *)mapView:(MKMapView *)newMapView viewForAnnotation:(id )newAnnotation {
MKPinAnnotationView *annotation = [[MKPinAnnotationView alloc] initWithAnnotation:newAnnotation reuseIdentifier:#"currentloc"];
if (annotation == nil) {
annotation = [[MKAnnotationView alloc] initWithAnnotation:newAnnotation reuseIdentifier:#"currentloc"];
}
annotation.image = [UIImage imageNamed:#"anno.png"];
annotation.canShowCallout = YES;
annotation.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
UIImageView *imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"bus_stop_30x30.png"]];
annotation.leftCalloutAccessoryView = imgView;
return annotation;
}
My code looks identical to some sample code that does not produce this problem.

Answer 1

Answering my own question here, just in case others have the same issue. Notice that I am using "MKPinAnnotationView" - it should be changed to "MKAnnotationView" and everything works.
Fixed code:
- (MKAnnotationView *)mapView:(MKMapView *)newMapView viewForAnnotation:(id )newAnnotation {
MKAnnotationView *annotation = [[MKAnnotationView alloc] initWithAnnotation:newAnnotation reuseIdentifier:#"currentloc"];
if (annotation == nil) {
annotation = [[MKAnnotationView alloc] initWithAnnotation:newAnnotation reuseIdentifier:#"currentloc"];
}
annotation.image = [UIImage imageNamed:#"anno.png"];
annotation.canShowCallout = YES;
annotation.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
UIImageView *imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"bus_stop_30x30.png"]];
annotation.leftCalloutAccessoryView = imgView;
return annotation;
}

Answer 2

I think this is one of the best ways:
(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation
{
NSLog(#"welcome into the map view annotation");
MyAnnotation* myAnnotation1=annotation;
// if it's the user location, just return nil.
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil;
if([mapView isEqual:mapMainView]== NO)
{
return nil;
}
// try to dequeue an existing pin view first
// if ([annotation isKindOfClass:[myAnnotation1 class]])
// {
// try to dequeue an existing pin view first
static NSString* AnnotationIdentifier = #"AnnotationIdentifier";
MKPinAnnotationView* pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:AnnotationIdentifier];
if (nil == pinView)
{
MKAnnotationView* annotationView = [[[MKAnnotationView alloc] initWithAnnotation:annotation
reuseIdentifier:AnnotationIdentifier] autorelease];
// annotationView.canShowCallout = YES;
// pinView.animatesDrop=YES;
//pinView.pinColor=MKPinAnnotationColorPurple;
//image
UIImage* flagImage = [UIImage imageNamed:#"map_marker_over2.png"];
CGRect resizeRect;
resizeRect.size = flagImage.size;
CGSize maxSize = CGRectInset(self.view.bounds,
[MapPropertyViewController annotationPadding],
[MapPropertyViewController annotationPadding]).size;
maxSize.height -= self.navigationController.navigationBar.frame.size.height + [MapPropertyViewController calloutHeight];
if (resizeRect.size.width > maxSize.width)
resizeRect.size = CGSizeMake(maxSize.width, resizeRect.size.height / resizeRect.size.width * maxSize.width);
if (resizeRect.size.height > maxSize.height)
resizeRect.size = CGSizeMake(resizeRect.size.width / resizeRect.size.height * maxSize.height, maxSize.height);
resizeRect.origin = (CGPoint){0.0f, 0.0f};
UIGraphicsBeginImageContext(resizeRect.size);
[flagImage drawInRect:resizeRect];
UIImage *resizedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
annotationView.image = resizedImage;
annotationView.opaque = NO;
UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[rightButton setTitle:annotation.title forState:UIControlStateNormal];
[rightButton addTarget:self
action:#selector(showDetails:)
forControlEvents:UIControlEventTouchUpInside];
rightButton.tag = myAnnotation1.tagAnnotation;
annotationView.rightCalloutAccessoryView = rightButton;
profileIconView = [[UIImageView alloc]initWithFrame:CGRectMake(18.5f, 10.0f, 37.0f, 30.0f)];
annotationView.leftCalloutAccessoryView = profileIconView;
//image
img = [UIImage imageWithData: [NSData dataWithContentsOfURL: [NSURL URLWithString:[arrImages objectAtIndex:myAnnotation1.tagAnnotation]]]];
NSLog(#"Annotation Click %d",[arrImages count]);
NSLog(#"image %#",img);
profileIconView.image=img;
[profileIconView release];
[annotationView setEnabled:YES];
[annotationView setCanShowCallout:YES];
return annotationView;
}
return pinView;
// }
// return nil;
}

Answer 3

Try this if you want to set both Source to Destination pin images different.
MKPointAnnotation * sourceAnno= [[MKPointAnnotation alloc] init];
sourceAnno.coordinate=CLLocationCoordinate2DMake(YourSourcelatitude,YourSourcelongitude);
[sourceAnno setAccessibilityLabel:#“Source”];
sourceAnno.title = #“You”;
[mapview addAnnotation: sourceAnno];
DestinationAnno = [[MKPointAnnotation alloc] init];
DestinationAnno.coordinate = CLLocationCoordinate2DMake(YourDestinationlatitude,YourDestinationlongitude);
[DestinationAnno setAccessibilityLabel:#“Destination”];
DestinationAnno.title =#“Destination”;
[mapview addAnnotation: DestinationAnno];
In Delegate Method
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
MKPointAnnotation *PointAnno=(MKPointAnnotation *)annotation;
NSString * kPinAnnotationIdentifier = PointAnno.accessibilityLabel;
MKAnnotationView *AnnotationView = [[MKAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:kPinAnnotationIdentifier];
if ([kPinAnnotationIdentifier isEqualToString:#"Source"])
{
AnnotationView.centerOffset = CGPointMake(8, -14);
AnnotationView.calloutOffset = CGPointMake(-8, 0);
AnnotationView.image = [UIImage imageNamed:#"pin_blue.png"];
AnnotationView.canShowCallout = YES;
}
else if([kPinAnnotationIdentifier isEqualToString:#"Destination"])
{
AnnotationView.centerOffset = CGPointMake(8, -14);
AnnotationView.calloutOffset = CGPointMake(-8, 0);
AnnotationView.image = [UIImage imageNamed:#"pin_red.png"];
AnnotationView.canShowCallout = YES;
}
return AnnotationView;
}
Thank you