How do I reverse the order of objects in an NSMutableArray?

Question

I'm trying to achieve something like this

NSMutableArray *myArray = [NSMutableArray arrayWithObjects:@"A",@"B",@"C", nil];
NSLog(@"Array: %@", myArray);
//logs A, B, C.

//reverse code here

 NSLog(@"Array: %@", myArray);
//logs C, B, A

The code isn't exact, just a demo. But you get the idea.

Any way to do this?

I found this similar post on stackOverflow: http://stackoverflow.com/questions/586370/how-can-i-reverse-a-nsarray-in-objective-c I think it will fit your requirements as well. — D.C., Jan 16 '10 at 23:35

score 164 · Accepted Answer · edited Mar 03 '16 at 06:08

164

Simply use;

NSArray* reversed = [[myArray reverseObjectEnumerator] allObjects];

The order is documented to be correct:

This array contains all the remaining objects of the enumerator in enumerated order [emphasis added].

edited Mar 03 '16 at 06:08

jscs

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answered Jan 16 '10 at 23:42

EEE

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will this work with mutable array? – Sam Jarman Jan 16 '10 at 23:55
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Yes; an NSMutableArray is, by declaration, a subclass of NSArray. – bbum Jan 17 '10 at 00:48
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Not guaranteed to work. It could break anytime. – Georg Schölly Apr 28 '10 at 19:20
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@user102008 The allObjects call made at the end is not *guaranteed* to return objects in any defined order. It just happens to always return them in order on devices so far. – meddlingwithfire Jan 24 '12 at 14:41
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@GeorgSchölly Now guaranteed by documentation. – Albert Renshaw Jul 14 '18 at 19:03

How do I reverse the order of objects in an NSMutableArray?

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