Replace object Index in NSMutableArray

Question

I have NSMutableArray. There are for example such objects: 0, 1, 2. How can I replace object 0 into index where object 2. In result I want array with objects: 1, 2, 0. Thanks.

Ilanchezhian · Accepted Answer · 2011-11-21 13:24:34Z

8

@trojanfoe, there is a simple mistake in your answer.

The first line of the code does not return anything as per doc. So it should be,

id object = [[array objectAtIndex:0] retain];
[array removeObjectAtIndex:0];
[array insertObject:object atIndex:2];
[object release];

answered Nov 21, 2011 at 13:24

Ilanchezhian

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2 Comments

dasdom Over a year ago

This is a comment and not an answer.

zaph Over a year ago

There is no need to retain and later release object because objectAtIndex returns a retained and autoreleased object.

joerick · Accepted Answer · 2011-11-21 13:23:32Z

0

[array addObject:[array objectAtIndex:0]];
[array removeObjectAtIndex:0];

answered Nov 21, 2011 at 13:23

joerick

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Comments

zaph · Accepted Answer · 2011-11-21 13:26:26Z

0

First get a copy of the object, then remove it from index 0, then add it at index 2.

id object = [array objectAtIndex:0];
[array removeObjectAtIndex:0];
[[array insertObject:object atIndex:2];

answered Nov 21, 2011 at 13:26

zaph

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