I am trying to change the pin colour from the default red to a custom image but whatever I am trying just isn't working.
I have downloaded the sample code from this website:
http://icodeblog.com/2009/12/21/introduction-to-mapkit-in-iphone-os-3-0/
The code works on it's own but when I import the annotation classes into my code, they do not work and I have no idea why. I have also tried a number of different methods from other sites but I can't even get the pin colour to change.
My project has 4 tabs and the MapView is on one of the tabs. When I select it, it parses a JSON string and adds the separate annotations onto the map. i have the title and subtitle showing up when I click on the pin, but cannot change the colour or image.
Here is how I add my annotations – MapAnnotation follows MKAnnotation:
MapAnnotation *ann = [[MapAnnotation alloc] initWithCoordinate:newCoord];
ann.title = [locationDictionary objectForKey:@"name"];
ann.subtitle = [locationDictionary objectForKey:@"name"];
[mapView addAnnotation:ann];
[ann release]
Here is how I try and attempt to change the colour – I have MapView.delegate=self in the view controller:
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation{
MKPinAnnotationView *pin = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:[annotation title]];
if (pin == nil) {
pin = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:[annotation title]] autorelease];
}else {
pin.annotation = annotation;
}
pin.pinColor = MKPinAnnotationColorGreen;
pin.animatesDrop = YES;
pin.canShowCallout = TRUE;
return pin;
}
I get the annotations to appear with title and subtitle, just not green markers. They're always red wether I use colours or images. If anyone could help me out, that would be great!
Thanks
EDIT:
The mapView delegate is assigned in the viewDidLoad method. I also add an Overlay to a certain part of the map. This is working fine, I have also taken it out and tried it without that incase it was causing a problem but it still didn't fix it.
- (void)viewDidLoad {
[super viewDidLoad];
MKCoordinateRegion cordRgn;
LusuAppAppDelegate *delegate =[[UIApplication sharedApplication]delegate];
if (delegate.CurrentLocation == 0) {
cordRgn.center.latitude = (CENTRE_OF_POSITION_2_LAT);
cordRgn.center.longitude = (CENTRE_OF_POSITION_2_LON);
delegate.CurrentLocation = 1;
}else if (delegate.CurrentLocation == 1) {
cordRgn.center.latitude = (CENTRE_OF_POSITION_1_LAT);
cordRgn.center.longitude = (CENTRE_OF_POSITION_1_LON);
delegate.CurrentLocation = 0;
}
cordRgn.span.latitudeDelta = 0.009f;
cordRgn.span.longitudeDelta = 0.009f;
self.locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
[locationManager startUpdatingHeading];
//add overlay
MKRasterOverlay *overlay = [[MKRasterOverlay alloc] init];
[overlay setCoordinate:CLLocationCoordinate2DMake(54.005508, -2.780507)];
MKMapRect mkrect;
MKMapPoint mkpointa, mkpointb;
mkrect.origin = MKMapPointForCoordinate(CLLocationCoordinate2DMake(54.016964, -2.794862));
mkpointa = MKMapPointForCoordinate(CLLocationCoordinate2DMake(54.016964, 2.000000));
mkpointb = MKMapPointForCoordinate(CLLocationCoordinate2DMake(54.001447, 2.013770));
mkrect.size.width = mkpointb.x - mkpointa.x;
mkrect.size.height = mkpointb.y - mkpointa.y;
overlay.boundingMapRect = mkrect;
mapView.delegate = self;
[mapView addOverlay:overlay];
[mapView setRegion:cordRgn animated:NO];
[self.mapView setShowsUserLocation:YES];
[self doAnnotations];
}
The doAnnotations function is the code shown above but in a loop. Thanks again for your help.
Best Answer
Your code looks fine to me. I suspect you have an error in your delegate assignment and
mapView:viewForAnimation
is not actually being called. An MKMapView without a delegate providing that function will work fine, with red pins for all annotations. Try adding someNSLog
statements or setting a breakpoint in the debugger to make sure you're actually executing this code.You probably already know this, but using your own images will require you to create pins that are
MKAnnotationView
s rather thanMKAnnotationPinView
s.