Logic Issue - MapKit

Question

Following is my MapKitDisplayViewController.m

- (void)viewDidLoad {
    [super viewDidLoad];

        [mapView setMapType:MKMapTypeStandard];
        [mapView setZoomEnabled:YES];
        [mapView setScrollEnabled:YES];
        MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } }; 
        region.center.latitude = 22.569722 ;
        region.center.longitude = 88.369722;
        [mapView setRegion:region animated:YES]; 

        [mapView setDelegate:self];

        DisplayMap *ann = [[DisplayMap alloc] init]; 
        ann.title = [person name];
        ann.subtitle = [person address]; 
        ann.person = person;

        ann.coordinate = region.center; 
        [mapView addAnnotation:ann];
}
-(MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:
 (id <MKAnnotation>)annotation {
        MKPinAnnotationView *pinView = nil; 
        if(annotation != mapView.userLocation) 
        {
                static NSString *defaultPinID = @"com.invasivecode.pin";
                pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
                if ( pinView == nil ) pinView = [[[MKPinAnnotationView alloc]
                                                                                  initWithAnnotation:annotation reuseIdentifier:defaultPinID] autorelease];
                UIImageView *iconView = [[UIImageView alloc] initWithImage: [UIImage imageWithString:@?????????????????];
                annotationView.leftCalloutAccessoryView = iconView;

                pinView.pinColor = MKPinAnnotationColorRed; 
                pinView.canShowCallout = YES;
                pinView.animatesDrop = YES;
                } 

        return pinView;
}

You will see the line where it'll say ???????? I need to display an image there.

When the user clicks a pin point, then the popup will appear. Title, subtitle and the image is suppose to be displayed on the popup. I believe that the following line should display the image for that popup. But i am unable to pass the Person object's (or the pipoint which contains the person object) image URL to this method. Can you help me display the selected Image URL here.

Answer 1

It doesn't fail. I need to know how to pass the person object selected by the user to viewForAnnotation method

Ahhh, I see know. I had a similar issue, and it can be a be tricky. I'm right in the middle of reworking my Annotation code, so you can see it since it doesn't work, but I you need to store something away that you can then later retrieve.

I made an object, MKAnnotation.

@interface FotoMapLocation : NSObject <MKAnnotation> {

So when I make an annotation, I create a FotoMapLocation object.

    FotoMapLocation *annotation = [[FotoMapLocation alloc] initWithTitle:title 
                                                            subtitle:subtitle 
                                                                foto:aFoto 
                                                      thumbnailImage:aFoto.thumbnailImage
                               ];
    [mapView addAnnotation:annotation]; 

Now, you can store anything here. So store your Person object in your subclass.

I know this is only halfway there, and very rambling. But I was right in the middle of ripping that code out, and then another fire came up, so it is currently in an in-between state. But I expect to return to it in a few days. I'll check back and if you don't have anything I'll update this answer.

Answer 2

This is what i did, in the viewForAnnotation method

DisplayMap *dm= (DisplayMap *)annotation;

NSString *url = [dm.person urlOfPerson];