override MKPointAnnotation class [closed] - ios

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I override MKAnnotation and add two property (NSManagedObject and UIImage) to MKAnnotation class something like that but it's not work what is wrong with this code?
// myAnnotation.h
#import <MapKit/MapKit.h>
#interface myAnnotation : NSObject<MKAnnotation>{
NSManagedObject *Contact;
UIImage *image;
NSString *title;
NSString *subtitle;
CLLocationCoordinate2D coordinate;
}
#property (nonatomic,copy) NSManagedObject *Contact;
#property (nonatomic, copy) UIImage *image;
#property (nonatomic,assign) CLLocationCoordinate2D coordinate;
#property (nonatomic,copy) NSString *title;
#property (nonatomic,copy) NSString *subtitle;
#end
// myAnnotation.m
#import "myAnnotation.h"
#implementation myAnnotation
#synthesize Contact,title,subtitle,coordinate,image;
#end
// MapVC.h
#import "myAnnotation.h"
#interface MapVC : UIViewController<MKMapViewDelegate,UIActionSheetDelegate,MFMessageComposeViewControllerDelegate,MFMailComposeViewControllerDelegate,UISearchBarDelegate>{
MKMapView *mapview;
myAnnotation *tmpContact;
}
// MapVC.m
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
[mapview removeAnnotations:mapview.annotations];
//add each object in Contacts entity to map view
NSManagedObjectContext *context = [self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
fetchRequest=[[NSFetchRequest alloc]initWithEntityName:#"Contacts"];
fetchRequest.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:#"name" ascending:YES selector:#selector(localizedCaseInsensitiveCompare:)]];
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:nil];
for (NSManagedObject *info in fetchedObjects) {
NSLog(#"Name: %#", [info valueForKey:#"name"]);
//initializetion latitude and longitude
aLng=[[info valueForKey:#"lng"] doubleValue];
aLat=[[info valueForKey:#"lat"] doubleValue];
//if latitude and longitude not null
if(aLng && aLat && aLng!=0.0 &&aLat!=0.0)
{
//create a new Coordinate
CLLocationCoordinate2D wimLocation;
wimLocation.latitude=aLat;
wimLocation.longitude=aLng;
myAnnotation *myAnn=[myAnnotation alloc];
myAnn.coordinate=wimLocation;
myAnn.title=[info valueForKey:#"name"];
myAnn.Contact=info;
UIImage *image = [UIImage imageWithData:[info valueForKey:#"photo"]];
myAnn.image=image;
//add create Annotation to mapview
[self.mapview addAnnotation:myAnn];
}
}
}
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
if ([annotation isKindOfClass:[myAnnotation class]])
{
static NSString *reuseId = #"ann";
MKAnnotationView *av = [mapView dequeueReusableAnnotationViewWithIdentifier:reuseId];
if (av == nil)
{
av = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseId];
}
else
{
av.annotation = annotation;
}
myAnnotation *ann = (myAnnotation *)annotation;
av.image = ann.image;
return av;
}
//return nil (default view) if annotation is not our custom type
return nil;
}

Answer 1

Just subclass MKPointAnnotation or implement the MKAnnotation protocol in your custom class.