Sorting Array in increasing order

Question

I have an array that contains values like 0,3,2,8 etc.I want to sort my array in increasing order.Please tell me how to do this.

Thanks in advance!!

Regexident · Accepted Answer · 2011-04-13T13:24:09.600

If your array is an NSArray containing NSNumbers:

NSArray *numbers = [NSArray arrayWithObjects:
                    [NSNumber numberWithInt:0],
                    [NSNumber numberWithInt:3],
                    [NSNumber numberWithInt:2],
                    [NSNumber numberWithInt:8],
                    nil];

NSSortDescriptor* sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:nil ascending:YES selector:@selector(localizedCompare:)];
NSArray *sortedNumbers = [numbers sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];

Keep in mind though, that this is just one way to sort an NSArray.

Just to name a few other methods of NSArray:

If your array is a c int array containing ints:

#include <stdio.h>
#include <stdlib.h>
int array[] = { 0, 3, 2, 8 };
int sort(const void *x, const void *y) {
    return (*(int*)x - *(int*)y);
}
void main() {
    qsort(array, 10, sizeof(int), sort);
}

score 7 · Answer 2 · answered Apr 13 '11 at 13:23

7

You don't need a sort descriptor if your array is that simple with NSNumbers only. If it's called array, then

[array sortedArrayUsingSelector:@selector(compare:)];

will return a new array sorted in increasing order, as you want.

answered Apr 13 '11 at 13:23

sidyll

57,726
14
108
151

score 2 · Answer 3 · answered Apr 13 '11 at 13:21

NSSortDescriptor *sortDescriptor;
sortDescriptor = [[[NSSortDescriptor alloc] initWithKey:nil
                                              ascending:YES] autorelease];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
NSArray *sortedArray;
sortedArray = [**YourArray** sortedArrayUsingDescriptors:sortDescriptors];

score 1 · Answer 4 · answered Apr 13 '11 at 13:18

Sorting has many solutions, each with different efficiencies.

The easiest and most natural sort, in my opinion, is insertion sort. Go to this page and scroll down to look at the code. Insertion sort

For a more complete list of all of the sorting algorithms, check this page

score 1 · Answer 5 · edited May 23 '17 at 11:53

1

Use the code: [[myData allKeys]sortedArrayUsingSelector:@selector(psuedoNumericCompare:)];

myData is your array. If you use that line in your code, it will sort on size of the integer (and not alphabetic, so it won't sort like 1, 111, 2,322, 333, 4445, 45, 67 but like 1, 2, 45, 67, 111, 322, 333, 4445).

Original source: How to let the sortedArrayUsingSelector using integer to sort instead of String?

edited May 23 '17 at 11:53

Community

1
1

answered Apr 13 '11 at 13:18

Joetjah

6,292
8
55
90

1

psuedoNumericCompare isn't a method on NSString, you'll have to add it yourself. – James P Jan 05 '16 at 14:28

score 0 · Answer 6 · answered May 05 '16 at 07:35

0

You can sort the array in simple method using sortUsingSelector the code as follows.

[array sortUsingSelector:@selector(compare:options:)];
NSLog(@"array after sort in max:%@",array);

i think its the simplest way without using any descriptors.

answered May 05 '16 at 07:35

Soorej Babu

350
2
19

score 0 · Answer 7 · answered Jul 09 '16 at 12:43

Try this .If you have Array intArr like {1,10.11,12,2,23}

NSArray *array = [intArr copy];
    NSArray *sortedArray = [array sortedArrayUsingComparator: ^(id obj1, id obj2) {

        if ([obj1 integerValue] == 0 && [obj2 integerValue] == 0)
        {
            return (NSComparisonResult)NSOrderedSame;
        }
        if ([obj1 integerValue] == 0)
        {
            return (NSComparisonResult)NSOrderedDescending;
        }
        if ([obj2 integerValue] == 0)
        {
            return (NSComparisonResult)NSOrderedAscending;
        }

        if ([obj1 integerValue] > [obj2 integerValue])
        {
            return (NSComparisonResult)NSOrderedDescending;
        }

        if ([obj1 integerValue] < [obj2 integerValue])
        {
            return (NSComparisonResult)NSOrderedAscending;
        }
        return (NSComparisonResult)NSOrderedSame;
    }];

Sorting Array in increasing order

7 Answers7

Linked