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[David Casseres]

Originally Posted by PhilSimpson

OK, here's my AnnotationListObject.h file:

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface AnnotationListObject : NSObject <MKAnnotation> {
CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subtitle;
}
@property (nonatomic) CLLocationCoordinate2D coordinate;
@property (nonatomic, retain) NSString *title;
@property (nonatomic, retain) NSString *subtitle;
- (void) moveAnnotation: (CLLocationCoordinate2D) newCoordinate;
@end


And the AnnotationListObject.m file:

#import "AnnotationListObject.h"

@implementation AnnotationListObject

@synthesize coordinate, title, subtitle;

- (void) moveAnnotation: (CLLocationCoordinate2D) newCoordinate {
coordinate = newCoordinate;
}

@end


and the relevant calls from RootViewController:

- (MKAnnotationView *) mapView: (MKMapView *) mapView viewForAnnotation: (id<MKAnnotation>) annotation {
MKPinAnnotationView *pin = (MKPinAnnotationView *) [map 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;
}

- (void) doAnnotations { // call this from viewDidAppear or somesuch
NSMutableArray annotationList = [NSMutableArray new];
// create loop here if necessary
AnnotationListObject *newAnnotation = [AnnotationListObject new];
CLLocationCoordinate2D tempCoordinate;
tempCoordinate.latitude = 0.0; // set latitude to required value
tempCoordinate.longitude = 0.0; // set longitude to required value
[newAnnotation setCoordinate: tempCoordinate];
[newAnnotation setTitle: @"Title"]; // or whatever
[newAnnotation setSubtitle: @"Subtitle"]; // or whatever
[annotationList addObject: newAnnotation];
newAnnotation release];
// end loop here if looped
[map addAnnotations: annotationList];
}

this is all assuming you have an MKMapView called 'map' correctly connected in Interface Builder. Import the 'AnnotationViewList.h' in the RootViewController file and it should behave. It does for me. Now, if only I could get setRegion:animated: to behave...

It turns out my problem was very simple: I was not setting a delegate for the MKMapView. It seems a bit rude for the MapKit to throw an exception for that, but the whole thing was my mistake.

Thanks for your sample code, which may help me even though my problem was something else.