how to make custom pin like friends map of 4sq app - iphone

Question

How to make custom pin like foursquare friends map instead of pin on map?
image is here, http://www.socialmedianews.com.au/wp-content/uploads/2010/07/foursquare-friends-map.png

Answer 1

- (MKAnnotationView *)mapView:(MKMapView *)mv viewForAnnotation:(id <MKAnnotation>)annotation {
MKAnnotationView *pinView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:#"pinView"];
if (!pinView) {
pinView = [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"pinView"] autorelease];
pinView.image = [UIImage imageNamed:#"SPOON4.png"];
pinView.frame = CGRectMake(-30, 0, 70, 67.5);
//pinView.animatesDrop = YES; can't animate with custom pin images
pinView.canShowCallout = YES;
UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
pinView.rightCalloutAccessoryView = rightButton;
} else {
pinView.annotation = annotation;
}
if (annotation == mapView.userLocation){
return nil; //default to blue dot
}
return pinView;
}

Answer 2

You need to use a custom MKAnnotationView.
You can use the MKAnnotationView class
as is or subclass it to provide custom
behavior as needed. The image property
of the class lets you set the
appearance of the annotation view
without subclassing directly. You
might also create custom subclasses as
a convenience and use them to put the
annotation view in a known state. For
example, the MKPinAnnotationView
subclass initializes the contents of
the annotation view to a pin image.

Answer 3

You want to replace the custom pin with a framed portrait. You can draw the frame with Quartz, or add the frame as a second transparent image. I would do the second adding the following to MKAnnotationView:
- (id)initWithAnnotation:(id <MKAnnotation>)annotation
reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
if (self != nil) {
self.opaque = NO;
self.frame = CGRectMake(0,0, self.portraitImage.size.width, self.portraitImage.size.height);
}
return self;
}
- (void)drawRect:(CGRect)rect {
[self.frameImage drawInRect:CGRectMake(0, 0, frameImage.width, frameImage.height)];
[self.portraitImage drawInRect:CGRectMake(0, 0, portraitImage.width, portraitImage.height)];
}