Question

I am trying to show multiple points on maps.

I tried

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];

this code but only the last pin is on the map.

Can I solve this by listArray or somethink like that ? If I can, how can I create Array for an object with objective-c ?

Answer 1

You want to create DisplayMap object for each annotation
modify your code as below

for( int i =1;i<=5;i++ ){
  DisplayMap *ann = [[DisplayMap alloc] init];   
  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];

}
this will work

Or you can use array

 NSMutableArray *annotationArray = [NSMutableArray alloc]init];
 for(int i = 0; i <= 5; i++) {

   DisplayMap *ann = [[DisplayMap alloc] init];   
   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;

   [annotationArray addObject:ann];
 }
 for(DisplayMap *ann in annotationArray) {
  [mapView addAnnotation:ann];
  }