Iphone – How to determine a CLLocation or MKPlacemark from an address

geocodingiphoneiphone-sdk-3.0mapkit

I've seen API documentation and demo after demo on how to do a reverse geocode – to get an address, given a Lat/Long location. I need to do the reverse. I'm assuming that this is already solved problem since Apple's MapKit API avoids it entirely.

Best Solution

One way is to use the google webservice like so: 

-(CLLocationCoordinate2D) addressLocation {
    NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv", 
                           [addressField.text stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
    NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString]];
    NSLog(@"locationString = %@",locationString);

    NSArray *listItems = [locationString componentsSeparatedByString:@","];

    double latitude = 0.0;
    double longitude = 0.0;
    if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:@"200"]) {
        latitude = [[listItems objectAtIndex:2] doubleValue];
        longitude = [[listItems objectAtIndex:3] doubleValue];
/*      
        NSString *nameString = [NSString stringWithFormat:@"http://ws.geonames.org/findNearestAddress?lat=%f&lng=%f",latitude,longitude];
        NSString *placeName = [NSString stringWithContentsOfURL:[NSURL URLWithString:nameString]];
        NSLog(@"placeName = %@",placeName);
 */
    }
    else {
        //Show error
    }
    CLLocationCoordinate2D location;
    location.latitude = latitude;
    location.longitude = longitude;

    return location;

}
Related Question