Sort by distance

Question

I have a set of dictionaries in an array. I display this data in a tableview. In the tableview i calculate the distance to each object and display that in the cell.

Answer 1

You can easily sort with a the block based comparator api.

NSArray *rawData = [NSArray arrayWithContentsOfFile:pathDoc];

rawData = [rawData sortedArrayUsingComparator: ^(id a, id b) {

    CLLocationDistance dist_a= [[a objectsForKey:@"coordinate"] distanceFromLocation: userPosition];
    CLLocationDistance dist_b= [[b objectsForKey:@"coordinate"] distanceFromLocation: userPosition];
    if ( dist_a < dist_b ) {
        return NSOrderedAscending;
    } else if ( dist_a > dist_b) {
        return NSOrderedDescending;
    } else {
        return NSOrderedSame;
    }
}];

You should easy find an implementation for calculate_distance(user_position, a); with google.