Question

please i have recently made a Map which suppose to show the user location (green pin color) and others annotations for service stations (red pins color), for the moment, i am able to show all annotations with the same color and i still unable to tell the MKMapView delegate how to make difference between two pin types and so assign to each type the right title to show.
this is my MKAnnotationView method :

- (MKAnnotationView *)mapView:(MKMapView *)map viewForAnnotation:(id <MKAnnotation>)annotation {

    static NSString *identifier = @"MyLocation";   
    if ([annotation isKindOfClass:[MyLocation class]]) {

        MKPinAnnotationView *annotationView = (MKPinAnnotationView *) [map dequeueReusableAnnotationViewWithIdentifier:identifier];
        if (annotationView == nil) {
            annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
        } else {
            annotationView.annotation = annotation;
        }

        annotationView.enabled = YES;
        [annotationView setAnimatesDrop:YES];
        annotationView.canShowCallout = YES;

               return annotationView;
    }

    return nil;    
}

and for my class which implement the MKAnnotation delegate i have this method :

-(id)initWithName:(NSString *)enseigneDeLaStation distanceVersLaStation:(NSString *) distanceVersLaStation coordinate:(CLLocationCoordinate2D)coordinate
{
    if ((self = [super init])) {
        _enseigneDeLaStation = [enseigneDeLaStation copy];
        _distanceVersLaStation = [distanceVersLaStation copy];
        _coordinate = coordinate;
    }
    return self;
}

thx in advance for your help 🙂

EDIT
i try to make the user location annotation like this, please if i am wrong correct me :

location2D = (CLLocationCoordinate2D){ .latitude = latitudeOfUserLocation, .longitude = longitudeOfUserLocation };
    MyLocation *annotation=[[[MyLocation alloc]initWithName:@"You are here" distanceVersLaStation:@"" coordinate:location2D]autorelease];
    [mapView addAnnotation:annotation];

EDIT 2
Hi again, i try to make one annotation to make sure it even call the annotation method so imake this simple example :

latitudeOfUserLocation=43.2923;
    longitudeOfUserLocation=5.45427;
    location2D = (CLLocationCoordinate2D){ .latitude = latitudeOfUserLocation, .longitude = longitudeOfUserLocation };
    MyLocation *annotation=[[[MyLocation alloc]initWithName:@"You are here" distanceVersLaStation:@"coucou" coordinate:location2D]autorelease];
    [mapView addAnnotation:annotation];

    MKCoordinateSpan span={latitudeDelta:1,longitudeDelta:0.5};
    MKCoordinateRegion region={location2D,span};
    [mapView setRegion:region];

when i run the app, i see the region zoomed well which go with the 43.2923/5.45427 but i don’t see the annotation, why it’s not calling the annotation method,i can’t move on since it’s not showing the user annotation, please help, thx in advance 🙂

EDIT 3
Hi, i assumed that this has always relation with making difference between user and station pins, so i have declared a var codeColor, set it to 1 (the type of the user) when invoking the annotations and set it to 2(station type) when calling the annotations for the stations :

-(void)viewWillAppear:(BOOL)animated
{  
       codeColor=1;//it's the first type, the user one
    MyLocation *annotation=[[[MyLocation alloc]initWithName:@"You are right here"   distanceVersLaStation:@"" coordinate:location2D]autorelease];
    annotation.pinColor = MKPinAnnotationColorGreen;  
    [mapView addAnnotation:annotation];

}

and :

-(void)requestFinished:(ASIHTTPRequest *)request
{  codeColor=2;
    [MBProgressHUD hideHUDForView:self.view animated:YES];
    MyLocation *annotation=[[[MyLocation alloc]initWithName:ensStation distanceVersLaStation:distance coordinate:location2D]autorelease];
           annotation.pinColor = MKPinAnnotationColorPurple;  
           [mapView addAnnotation:annotation];


           }

and for the annotations method :

if (codeColor==2) {

            annotationView.rightCalloutAccessoryView=[UIButton buttonWithType:UIButtonTypeDetailDisclosure];

        }

now when testing for the first time, all is ok, the user annotation without button and the station one is with the button, but when i move from the view and i came back, all annotations are with buttons, even the user one. could you please help me there, thx in advance 🙂

Answer 1

One simple way is to add a pinColor property to your MyLocation class:

@property (nonatomic, assign) MKPinAnnotationColor pinColor;

When creating the annotation, set the pinColor:

MyLocation *annotation=[[[MyLocation alloc]initWithName:@"You are here" distanceVersLaStation:@"" coordinate:location2D]autorelease];
annotation.pinColor = MKPinAnnotationColorGreen;  //or red or whatever
[mapView addAnnotation:annotation];

and in the viewForAnnotation method:

//...
annotationView.canShowCallout = YES;
annotationView.pinColor = ((MyLocation *)annotation).pinColor;