I am not able to give an MKAnnotation an image! - iphone

Question

Hey guys! I am having some trouble with giving an MKAnnotationView an image instead of a pin view. In other words, I am having trouble displaying a target image (target.png) instead of the normal pin view. Here is my code---
// .h file
#import //Here it says to import mapkit & UIKit. The code blockquote doesn't let me
#import //show you that
#interface AddressAnnotation : NSObject {
CLLocationCoordinate2D coordinate;
NSString *mTitle;
NSString *mSubTitle;
}
#end
#interface ChosenLocationMap : UIViewController {
IBOutlet MKMapView *mapView;
AddressAnnotation *addAnnotation;
}
-(CLLocationCoordinate2D) addressLocation;
// .m file
#implementation AddressAnnotation
#synthesize coordinate;
- (NSString *)subtitle{
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSString *stitle = [prefs objectForKey:#"addressKey"];
return #"%#",stitle;
}
- (NSString *)title{
return #"TARGET";
}
-(id)initWithCoordinate:(CLLocationCoordinate2D) c{
coordinate=c;
NSLog(#"%f,%f",c.latitude,c.longitude);
return self;
}
#end
#implementation ChosenLocationMap
#synthesize destinationLabel, startbutton, accelloop, aimview, bombblowupview, bombleftview1, bombleftview2, bombleftview3, firebutton;
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);
}
- (void)viewDidLoad {
mapView.mapType = MKMapTypeSatellite;
MKCoordinateSpan span;
span.latitudeDelta=0.2;
span.longitudeDelta=0.2;
CLLocationCoordinate2D location = [self addressLocation];
region.span=span;
region.center=location;
if(addAnnotation != nil) {
[mapView removeAnnotation:addAnnotation];
[addAnnotation release];
addAnnotation = nil;
}
addAnnotation = [[AddressAnnotation alloc] initWithCoordinate:location];
[mapView addAnnotation:addAnnotation];
[super viewDidLoad];
}
-(CLLocationCoordinate2D) addressLocation {
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSString *destinationstring = [prefs objectForKey:#"addressKey"];
NSString *urlString = [NSString stringWithFormat:#"http://maps.google.com/maps/geo?q=%#&output=csv",
[destinationstring stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString]];
NSArray *listItems = [locationString componentsSeparatedByString:#","];
double latitude = 0.0;
double longitude = 0.0;
if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:#"200"]) {
latitude = [[listItems objectAtIndex:2] doubleValue];
longitude = [[listItems objectAtIndex:3] doubleValue];
}
else {
//Show error
}
CLLocationCoordinate2D location;
location.latitude = latitude;
location.longitude = longitude;
return location;
}
- (MKAnnotationView *)map:(MKMapView *)map viewForAnnotation:(id )annotation{
MKAnnotationView *annView;
annView = (MKAnnotationView *) [mapView dequeueReusableAnnotationViewWithIdentifier:annotation.title];
if(annView == nil)
annView = [[[MKAnnotationView alloc]
initWithAnnotation:annotation reuseIdentifier:annotation.title] autorelease];
else
annView.annotation = annotation;
[annView setImage:[UIImage imageNamed:#"target.png"]];
annView.canShowCallout = TRUE;
return annView;
}
Please note that I only included the code that actually involves the mapview. Thanks in advance!
EDIT: I Changed the code in my Xcode document for the changes in answer 1. I am too lazy to transfer everything to the code block above, and still, the picture still doesn't work.
SHOOP DA EDIT: Thank you for replying! My solution was that I forgot to say mapView.delegate = self. Bye!

Answer 1

Wow so much wrong with this code :-)
First you are missing a #property declaration in your AddressAnnotation
#property (nonatomic,assign) CLLocationCoordinate2D coordinate;
In the subtitle method you do this:
return #"%#",stitle;
But this is Objective-C and not Python, so you might want to change this to:
return stitle;
Then your initWithCoordinate is completely wrong. You do not initialize super. This is better:
-(id) initWithCoordinate: (CLLocationCoordinate2D) c
{
if ((self = [super init]) != nil) {
coordinate=c;
NSLog(#"%f,%f",c.latitude,c.longitude);
}
return self;
}
Try fixing that stuff first to see if it helps :-)

Answer 2

I'm new to Objective C but I think the prototype for your delegate function should be :
- (MKAnnotationView *)mapView:(MKMapView *)map viewForAnnotation:(id )annotation{
MKAnnotationView *annView;
The delegate name is mapView:viewForAnnotation:, not map:viewForAnnotation:

Answer 3

Also you AddressAnnotation doesn't implement the MKAnnotation protocol