How to sort multi-dimensional array in objective-c?

Question

I'm having a two dimensional array as follows

NSArray *cities = [NSArray arrayWithObjects:@"New Delhi",@"Karachi",@"Dhaka",@"Columbu", nil];
NSArray *distance = [NSArray arrayWithObjects:@"500",@"1400",@"1200",@"2800", nil];
NSMutableArray *details= [[NSMutableArray alloc]initWithCapacity:cities.count];
[details addObject:cities];
[details addObject:distance];

Now, the details array looks like

(
    (
    "New Delhi",
    Karachi,
    Dhaka,
    Columbu
 ),
    (
    500,
    1400,
    1200,
    2800
 )
)

I need to sort the array with ascending order w.r.t distance array ie,

(
    (
    "New Delhi",
    Dhaka,
    Karachi,
    Columbu
 ),
    (
    500,
    1200,
    1400,
    2800
 )
)

how to do this?

I also need to sort the whole array by alphabetical order w.r.t cities array.

I tried using sortUsingComparator but, can't get the solution completely.

Any help would be appreciated.

Answer 1

self.arrayForRows = [[NSMutableArray alloc]init];
NSMutableArray *arrayForCities = [[NSMutableArray alloc]initWithObjects:@"Mumbai",@"Vizag",@"Hyderabad",@"Ahemdabad",@"Secunderabad", nil];
    NSMutableArray *arrayForDistance = [[NSMutableArray alloc]initWithObjects:@"200",@"320",@"32",@"450",@"14", nil];

    for (int i=0; i<arrayForCities.count; i++)
    {
        NSMutableDictionary *tempDicts = [[NSMutableDictionary alloc]init];
        [tempDicts setObject:[arrayForCities objectAtIndex:i] forKey:@"names"];
        [tempDicts setObject:[NSNumber numberWithInt:[[arrayForDistance objectAtIndex:i] intValue]] forKey:@"distance"];
        [self.arrayForRows addObject:tempDicts];
    }

    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"distance" ascending:YES];
    [self.arrayForRows sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];

Answer 2

Structure is complicated. Make a class city containing name and distance. Then add objects of this class. Then you can sort using city.distance.