Snippet to get the closest location (The dataset must be an array of dictionaries)

gistfile1.m

// Method: What is Nearer helper function
// Pre-requisite: dataset loaded in the app delegate
-(NSDictionary *) whatIsNearer:(CLLocation *)currentLocation {
	whichway_ipadAppDelegate *appdelegate = (whichway_ipadAppDelegate *)[[UIApplication sharedApplication] delegate];	
	float closest_distance;
	int linecnt = 1;
	NSDictionary *tmpDict = [[[NSDictionary alloc] init] autorelease];
	for (NSDictionary *store in appdelegate.dataset) {	
		NSString *latlong = [store objectForKey:@"LatLong"];
		NSArray *latlongarray = [latlong componentsSeparatedByString:@","];
		CLLocationDegrees lat = [[latlongarray objectAtIndex:0] doubleValue];
		CLLocationDegrees longitude = [[latlongarray objectAtIndex:1] doubleValue];
		CLLocation *tmploc = [[[CLLocation alloc] initWithLatitude:lat longitude:longitude] autorelease];
		CLLocationDistance current_dist = [tmploc distanceFromLocation:currentLocation];
		if (linecnt == 1) {
			closest_distance = current_dist;
			tmpDict = store;
		} else {
			if (current_dist < closest_distance) {
				tmpDict = store;
			}
		}

		linecnt++;
	}
	return tmpDict;
}