Customized Annotation - iphone

Question

i have a question regarding customized annotation here. Here is how i show the pin but i wish to insert an image in to the annotation when the user click on the pin. how can i do that?
- (void) showMarkingOnMap:(Service *) ser
{
if (!self.mapView.loaded) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"iPoly"
message:#"Failed to load the map."
delegate:self
cancelButtonTitle:#"Ok"
otherButtonTitles:nil, nil];
[alert show];
[alert release];
return;
}
id<AGSLayerView> graphicsLayerView = [self.mapView.mapLayerViews objectForKey:#"GraphicsLayer"];
AGSGraphicsLayer *graphicsLayer = (AGSGraphicsLayer*)graphicsLayerView.agsLayer;
[graphicsLayer removeAllGraphics];
// Create a symbols png graphic
AGSPictureMarkerSymbol *genSymbol = [AGSPictureMarkerSymbol pictureMarkerSymbolWithImageNamed:#"pushpin.png"];
ServiceInfoTemplate *infoTemplate = [[ServiceInfoTemplate alloc] init];
AGSGraphic *genGraphic;
AGSPoint *genPt;
NSMutableDictionary *dic= [[NSMutableDictionary alloc] init];
[dic setObject:[ser name] forKey:#"NAME"];
if([ser.location isEqualToString: #"\n"] || (ser.location == nil)){
[dic setObject:#"" forKey:#"DESC"];
} else {
[dic setObject:[ser location] forKey:#"DESC"];
}
genPt = [AGSPoint pointWithX:[[ser xcoordinate] floatValue]
y:[[ser ycoordinate] floatValue]
spatialReference:self.mapView.spatialReference];
genGraphic = [[AGSGraphic alloc] initWithGeometry:genPt symbol:genSymbol attributes:dic infoTemplateDelegate:infoTemplate];
[graphicsLayer addGraphic:genGraphic];
[graphicsLayer dataChanged];
[self.mapView zoomWithFactor:0.1 atAnchorPoint:genPt.cgPoint animated:NO];
[self.mapView centerAtPoint:genPt animated:YES];
//CGPoint *pt = CGPointMake([[ser ycoordinate] floatValue], [[ser xcoordinate] floatValue]);
}

Answer 1

It's not as easy as you might hope/think. Here's a full tutorial on how to do it.
Note that with this implementation, your callout will occupy the entire width of the view.
See:
http://blog.asolutions.com/2010/09/building-custom-map-annotation-callouts-part-1/