Sorting NSMuatbleArray with NSInterger values

Question

I want to sort NSMutableArray which have NSInteger values inside. I tried to use this solution:

 NSArray *sorted = [array sortedArrayUsingSelector:@selector(compare:)];

It almost worked, so i want to ask why not everything alright with it. Here is example of data:

not sorted = (
    30,
    42,
    54,
    6,
    18
)

 sorted = (
    18,
    30,
    42,
    54,
    6
)

We can see that it sorted everything but 6 value which is at the end off array.

Why this could happened ?

Thank you.

Full method:

- (void) initialize{
    NSInteger min = 30;
    NSInteger interval = 12;
    NSInteger count = floor(60/interval);

    for (int i = 0; i < count; i++) {

        [array addObject:[NSString stringWithFormat:@"%i",min]];
        min +=interval;

        if (min > 60)
            min -= 60;
    }

    //DLog(@"not sorted = %@",minutes);
    array = [[array sortedArrayUsingSelector:@selector(compare:)] mutableCopy];
    //DLog(@"sorted = %@",minutes);

}

What did you do with array? I can get the right result in my Mac. 2012-12-18 16:16:12.936 Untitled[10001:707] ( 30, 42, 54, 6, 18 ) 2012-12-18 16:16:12.938 Untitled[10001:707] ( 6, 18, 30, 42, 54 ) — onevcat, Dec 18 '12 at 07:17
have a look here http://stackoverflow.com/questions/2752992/how-to-let-the-sortedarrayusingselector-using-integer-to-sort-instead-of-string — CRDave, Dec 18 '12 at 07:21
How did you wrap NSIntegers? Are they wrapped in NSStrings, NSValues or NSNumbers? — ksh, Dec 18 '12 at 07:22

score 1 · Accepted Answer · answered Dec 18 '12 at 07:29

You are getting problem in above case because you are sorting string values not a NSNUMBER. You have to use NSNumber to add objects of integer. Then do something like:

      NSMutableArray *array = [[NSMutableArray alloc ] initWithObjects:
                              [NSNumber numberWithInt:10],    
                              [NSNumber numberWithInt:50],
                              [NSNumber numberWithInt:5],
                              [NSNumber numberWithInt:3],
                              nil];

      NSLog(@"SORTED = %@",[array sortedArrayUsingSelector:@selector(compare:
                                                               )]);

This will give you a sorted array.

Sorting NSMuatbleArray with NSInterger values

1 Answers1