核心数据实体绑定注释

Question

我使用下面的代码将所有联系人显示为注释地图here，现在我有一个问题是有什么方法可以在地图上获取某些操作的选定联系人（注释）（例如，呼叫，消息，... 。）

    //add each object in Contacts entity to map view
NSManagedObjectContext *context = [self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
                               entityForName:@"Contacts" inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:nil];



for (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;

        //create a new Annotation and initializetion it
        MKPointAnnotation * myAnnotation=[MKPointAnnotation alloc];
        myAnnotation.coordinate=wimLocation;
        myAnnotation.title=[info valueForKey:@"name"];


        //add create Annotation to mapview
        [self.mapview addAnnotation:myAnnotation];


    }
}

请根据我的代码提出您的答案，谢谢