Forward Geocoding with CLGeocoder Issues - iphone

Question

I'm having an issue using forward geocoding on iOS5 with the geocodeAddressString function.
I have a MKMapView open up as a modal view to display different locations with data grabbed from the internet. My issue is when I dismiss the modal view, and then open it up again. On second try, only about half of my annotations are actually placed on the map. On a third try, none show up.
I have a feeling my issue here has to do with memory management and the scope of the CLGeocoder, but I just can't figure it out.
I create all of my annotations in the ViewDidLoad function of the view controller containing the MapView. Here is the code I use to get the coordinates of the addresses:
int locationCount = 0;
for(NSDictionary *date in locations)
{
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder geocodeAddressString:[NSString stringWithFormat:#"%#, %#", [date objectForKey:#"venue"], [date objectForKey:#"location"]] completionHandler:^(NSArray *placemarks, NSError *error)
{
// if we find the exact location (including the venue string), create an annotation for the map
if(placemarks && placemarks.count > 0)
{
CLPlacemark *topResult = [placemarks objectAtIndex:0];
TourAnnotation *placemarkAnnotation = [[TourAnnotation alloc] initWithLocation:topResult.location andDetails:date];
placemarkAnnotation.tag = locationCount;
[tourMap addAnnotation:placemarkAnnotation];
}
// if not place an annotation at the center of the city
else
{
[geocoder geocodeAddressString:[date objectForKey:#"location"] completionHandler:^(NSArray *placemarks, NSError *error)
{
if(placemarks && placemarks.count > 0)
{
CLPlacemark *topResult = [placemarks objectAtIndex:0];
TourAnnotation *placemarkAnnotation = [[TourAnnotation alloc] initWithLocation:topResult.location andDetails:date];
placemarkAnnotation.tag = locationCount;
[tourMap addAnnotation:placemarkAnnotation];
}
}];
}
}];
++locationCount;
}
Any suggestions would be appreciated.

Answer 1

If it's memory issues have you considered how the annotation are dequeued and reused, the map view has a delegate method to do such a thing.
This tutorial may be of some assistance.
Ray Wenderlich map tutorial