sortedArrayUsingSelector on custom Classes?

Question

I have a NSMutableArray that has custom objects in it. Each object does have a name attribute. Is there a way to use

[myArray    sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)]

on the name somehow? Like

[myArray.name sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)]

Or am I better off writing a sort function for my custom class to sort by name? Thanks.

gcamp · Accepted Answer · 2011-06-02T16:56:40.277

11

In this case you need to use a NSSortDescriptor.

NSSortDescriptor* sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES selector:@selector(caseInsensitiveCompare:)];
NSArray* sortedArray = [myArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];

edited Jun 02 '11 at 16:56

answered Jun 02 '11 at 16:48

gcamp

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This will use compare: and not caseInsensitiveCompare: to sort the names. – omz Jun 02 '11 at 16:51
Right, forgot about that. This is probably more straightforward than my answer. – omz Jun 02 '11 at 16:55

score 4 · Answer 2 · answered Jun 02 '11 at 16:50

There are several ways to achieve this, one would be to define your own comparison method, as others have suggested, but if it's just a one-off thing, you could also use the new NSComparator API to use a block for sorting:

NSArray *sortedArray = [array sortedArrayUsingComparator:^(id obj1, id obj2) {
    return [[(MyClass *)obj1 name] caseInsensitiveCompare:[(MyClass *)obj2 name]];
}];

score 0 · Answer 3 · edited May 23 '17 at 12:14

0

I think this answer is what you're looking for.

How to sort an NSMutableArray with custom objects in it?

edited May 23 '17 at 12:14

Community

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answered Jun 02 '11 at 16:47

jaminguy

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sortedArrayUsingSelector on custom Classes?

3 Answers3