How do I access the available data when I click an annotation? - ios

Question

I have several annotation points. What I want to do is when I click an annotation point I want to display that data. I have a custom Annotation class with a title and an NSDictionary. The dictionary contains an image URL and ID. I want to fetch these when I click on a specific annotation.
EDIT: I know about the didSelectAnnotation, but how do I access the data?
-(void)annotations{
CLLocationCoordinate2D pinPoint;
for (NSDictionary * dict in _dataArray) {
pinPoint.latitude =[[dict valueForKey:#"lat"] doubleValue];
pinPoint.longitude = [[dict valueForKey:#"lng"] doubleValue];
_myAnnotation = [[MapViewAnnotation alloc]initWithTitle:[dict valueForKey:#"name"]andCoordinate:pinPoint andData:dict];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:pinPoint addressDictionary:nil] ;
_destination = [[MKMapItem alloc] initWithPlacemark:placemark];
_myAnnotation.title=[dict valueForKey:#"name"];
[self.mapKit addAnnotation:_myAnnotation];
}
}
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 800, 800);
[self.mapKit setRegion:[self.mapKit regionThatFits:region] animated:YES];
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(MapViewAnnotation*)annotation
{
// If it's the user location, just return nil.
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil;
// Handle any custom annotations.
if ([annotation isKindOfClass:[MapViewAnnotation class]])
{
// Try to dequeue an existing pin view first.
MKAnnotationView *pinView = (MKAnnotationView*)[mapView dequeueReusableAnnotationViewWithIdentifier:#"CustomPinAnnotationView"];
if (!pinView)
{
// If an existing pin view was not available, create one.
pinView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"CustomPinAnnotationView"];
pinView.canShowCallout = YES;
NSLog(#"%#",[annotation.data valueForKey:#"name"]);
pinView.image = [UIImage imageNamed:#"image"];
pinView.calloutOffset = CGPointMake(0, 32);
UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
pinView.rightCalloutAccessoryView = rightButton;
} else {
pinView.annotation = annotation;
}
return pinView;
}
return nil;
}
-(void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {
MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
[request setTransportType:MKDirectionsTransportTypeWalking];
request.source = [MKMapItem mapItemForCurrentLocation];
request.destination = _destination;
request.requestsAlternateRoutes = NO;
MKDirections *directions =
[[MKDirections alloc] initWithRequest:request];
[directions calculateDirectionsWithCompletionHandler:
^(MKDirectionsResponse *response, NSError *error) {
if (error) {
// Handle Error
} else {
[self showRoute:response];
}
}];
}
EDIT 2nd :
-(void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
{
MapViewAnnotation * annotation = (MapViewAnnotation *) view;
NSLog(#"%#",[annotation.data valueForKey:#"name"]);
NSURL *url =[NSURL URLWithString:[[NSUserDefaults standardUserDefaults] objectForKey:#"SPOTTD_profilePic"]];
NSData *imageData = [NSData dataWithContentsOfURL:url];
_imgMyProfile.image = [UIImage imageWithData:imageData];
}

Answer 1

You can use the didSelectAnnotationView method, in combination with the annotation property of the MKAnnotationView:
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
if ([view.annotation isKindOfClass:[MapViewAnnotation class]]) {
MapViewAnnotation *annotation = (MapViewAnnotation)view.annotation;
}
}
After you have safely cast the annotation to your custom type, you can access its properties like the NSDictionary.

Answer 2

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
NSString *latPoint2 = [NSString stringWithFormat:#"%.6f", view.annotation.coordinate.latitude];
NSString *longPoint2 =[NSString stringWithFormat:#"%.6f", view.annotation.coordinate.longitude];

Answer 3

There is one more method for annotation which is
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
{}.In this method you can show your data on click of annotation.Hope this will help you. If any query let me know. Thanks