How to sort NSMutableArray in objective C

Question

i am workinng on timer app. i have a an array.i want to sort array in accending order. suppose i have 5 element in array like 10,100,50,30,70.

I want array like 10,30,50,70,100.

Please post what you've tried so far. Without context it's difficult to help. — thegrinner, Aug 08 '12 at 12:17
possible duplicate of [How to sort an NSMutableArray with custom objects in it?](http://stackoverflow.com/questions/805547/how-to-sort-an-nsmutablearray-with-custom-objects-in-it) — Yannick Loriot, Aug 08 '12 at 12:56
The title shouldnt read "How to sort NSMutableArray in objective c" but **"How to search in Stackoverflow?"** — vikingosegundo, Aug 10 '12 at 13:11

score 11 · Answer 1 · answered Aug 08 '12 at 12:19

NSArray *sortedArray = [unsortedArray sortedArrayUsingComparator:^(id firstObject, id secondObject) {
    return [((NSString *)firstObject) compare:((NSString *)secondObject) options:NSNumericSearch];
}];

EDIT: If the elements are numbers, change the returned type and the type of the firstObject and secondObject.

score 3 · Answer 2 · answered Aug 08 '12 at 12:19

3

from apple's documentation

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

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

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

answered Aug 08 '12 at 12:19

John Corbett

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You should use the compare method of NSNumber if they are NSNumbers. – rckoenes Aug 08 '12 at 12:28
He doesn't say that they're NSNumbers though... – John Corbett Aug 08 '12 at 12:30
So you can stil call the `compare:`, since it a `NSObject` method – rckoenes Aug 08 '12 at 12:31

score 2 · Answer 3 · answered Aug 08 '12 at 12:20

2

Use sortedArrayUsingComparator

NSArray *arr = @[@3, @2, @6, @1];
NSArray *sorted = [arr sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    if ([obj1 intValue] < [obj2 intValue]) return NSOrderedAscending;
    else return NSOrderedDescending;
}];

answered Aug 08 '12 at 12:20

James Webster

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And what if they have the same value? – rckoenes Aug 08 '12 at 12:28
There is no disadvantage to it thinking e.g. 1 < 1. What's the difference between `1, 1, 3` and `1, 1, 3`? – James Webster Aug 08 '12 at 12:30
Try it with `@[@3, @2, @6, @1, @1, @1, @1];`, it produces the correct results. – James Webster Aug 08 '12 at 12:30

score 0 · Answer 4 · answered Aug 08 '12 at 12:42

 NSArray * arr=[[NSArray alloc]initWithObjects:[NSNumber   numberWithInt:10],[NSNumber   numberWithInt:100],[NSNumber   numberWithInt:50],[NSNumber   numberWithInt:30],[NSNumber   numberWithInt:70], nil];
    NSLog(@"Before sorting%@",arr);

    arr = [arr sortedArrayUsingSelector:@selector(compare:)];
      NSLog(@"After sorting%@",arr);

score -2 · Answer 5 · answered Aug 08 '12 at 12:19

NSSortDescriptor *aSortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"sort" ascending:YES comparator:^(id obj1, id obj2) {

    if ([obj1 integerValue] > [obj2 integerValue]) {
        return (NSComparisonResult)NSOrderedDescending;
    }
    if ([obj1 integerValue] < [obj2 integerValue]) {
        return (NSComparisonResult)NSOrderedAscending;
    }
    return (NSComparisonResult)NSOrderedSame;
}];
self.myList = [NSMutableArray arrayWithArray:[unsortedList sortedArrayUsingDescriptors:[NSArray arrayWithObject:aSortDescriptor]]];

There is no need to create the `NSSortDescriptor` you can use `sortedArrayUsingComparator:` methode with the same block. — rckoenes, Aug 08 '12 at 12:29

score -2 · Answer 6 · edited Aug 09 '12 at 07:36

-2

use this code:

NSArray *sortedArray = [unsortedArray sortedArrayUsingComparator:^(id firstObject, id secondObject) {
    return [((NSString *)firstObject) compare:((NSString *)secondObject) options:NSNumericSearch];
}];

EDIT: If the elements are numbers, change the returned type and the type of the firstObject and secondObject.

edited Aug 09 '12 at 07:36

Luke

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answered Aug 08 '12 at 12:27

Vineesh TP

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How to sort NSMutableArray in objective C

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