IPhone SDK MapKIt Multiple Points and Annotation - iphone

Question

I am new to IPhone SDK Development i am trying to make an application with MapKit i have done the first bit i want to add multiple pins and annotation to the application but i am lost here.
Following is the code how can i add more pins to this code
-(void)viewDidLoad{
[super viewDidLoad];
[mapView setMapType:MKMapTypeStandard];
[mapView setZoomEnabled:YES];
[mapView setScrollEnabled:YES];
MKCoordinateRegion region={{0.0,0.0,},{0.0,0.0}};
region.center.latitude = 26.438047;
region.center.longitude = 50.116422;
region.span.latitudeDelta=0.01f;
region.span.longitudeDelta=0.01f;
[mapView setRegion:region animated:YES];
[mapView setDelegate:self];
DisplayMap *ann = [[DisplayMap alloc] init];
ann.title = #"Corporate Office";
ann.subtitle =#"King Khalid Street";
ann.coordinate=region.center;
[mapView addAnnotation:ann];
}
-(MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:
(id <MKAnnotation>) annotation{
MKPinAnnotationView *pinView=nil;
if (annotation != mapView.userLocation) {
static NSString *defaultPinID = #"com.invasivecode.pin";
pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
if (pinView ==nil) pinView = [[[MKPinAnnotationView alloc]
initWithAnnotation:annotation reuseIdentifier:defaultPinID] autorelease];
pinView.pinColor=MKPinAnnotationColorRed;
pinView.canShowCallout=YES;
pinView.animatesDrop=YES;
pinView.calloutOffset= CGPointMake(-5, 5);
}
else {
[mapView.userLocation setTitle:"I am here"];
}
return pinView;
}

Answer 1

you are on the right track already, just reuse your code to make multiple points.
for example :
DisplayMap *ann = [[DisplayMap alloc] init];
for( int i =1;i<=5;i++ ){
region.center.latitude = 26.438047+i;
region.center.longitude = 50.116422+i;
ann.title = [NSString stringWithFormat:#"title %d",i)];
ann.subtitle =[NSString stringWithFormat:#"subtitle %d",i)];
ann.image = [NSString stringWithFormat#"image_%d.png",i];
ann.coordinate=region.center;
[mapView addAnnotation:ann];
}
[ann release];
in result, will display 5 points in different coordinate. (with same name and subtitle).
Edited: show different pin image. you have to add new field as NSString *image to DisplayMap. and add your path image inside for loop.
- (MKAnnotationView *) mapView:(MKMapView *)amapView viewForAnnotation:(id <MKAnnotation>) annotation
{
NSLog(#"pinnview before release %d",[pinView retainCount]);
if (pinView !=nil) {
pinView =nil;
[pinView release];
}
NSLog(#"pinnview after release %d",[pinView retainCount]);
// if it's the user location, just return nil.
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil;
if(annotation != map.userLocation)
{
static NSString *defaultPinID = #"your-pin";
pinView = (MKPinAnnotationView *)[map dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
if ( counting < [map.annotations count])
{
counting++;
pinView = [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:defaultPinID] autorelease];
for(DisplayMap* a in map.annotations)
{
if (annotation == a){
pinView.image =
[UIImage imageWithContentsOfFile:
[[NSBundle mainBundle] pathForResource:a.image ofType:nil]];
}
}
pinView.centerOffset= CGPointMake(0,-10);
pinView.canShowCallout = YES;
}
}
return pinView;
}