sort in objective c (Block)

gistfile1.txt

            NSArray* ary = [dict objectForKey:@"stores"];
            NSArray* sortedArray = [[NSArray alloc] init];
            sortedArray = [ary sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
                NSString *first  = [NSString stringWithFormat:@"%@", [obj1 objectForKey:@"distance"]];
                NSString *second = [NSString stringWithFormat:@"%@", [obj2 objectForKey:@"distance"]];
                NSString *comFirst = [first substringWithRange:NSMakeRange(first.length-2, 1)];
                NSString *comSecond = [second substringWithRange:NSMakeRange(second.length-2, 1)];
                NSString *firstfloat;
                NSString *seconfloat;
                
                if ([comFirst isEqualToString:@"k"]) {
                    firstfloat =  [NSString stringWithFormat:@"%f",[[first substringWithRange:NSMakeRange(0, first.length-3)] floatValue] * 1000];
                }
                else {
                    firstfloat = [NSString stringWithFormat:@"%f",[[first substringWithRange:NSMakeRange(0, first.length-2)] floatValue]];
                }
                
                if ([comSecond isEqualToString:@"k"]) {
                    seconfloat = [NSString stringWithFormat:@"%f",[[second substringWithRange:NSMakeRange(0, second.length-3)] floatValue] * 1000];
                }
                else {
                    seconfloat = [NSString stringWithFormat:@"%f",[[second substringWithRange:NSMakeRange(0, second.length-2)] floatValue]];
                }
                
                if ([firstfloat intValue] > [seconfloat intValue]) {
                    return (NSComparisonResult)NSOrderedDescending;
                }
                
                if ([firstfloat intValue] < [seconfloat intValue]) {
                    return (NSComparisonResult)NSOrderedAscending;
                }
                return (NSComparisonResult)NSOrderedSame;

            }];