iOS: replace an object inside an array of array

Question

My code is:

[[arrayOne objectAtIndex:indexSelected] replaceObjectAtIndex:1 withObject:new];


NSLog(@"indexSelected:%d", indexSelected); // = 0
NSLog(@"new:%@", new); // = 26

indexSelected is an int and new is a string

When I try to do this I have an exception that says: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI replaceObjectAtIndex:withObject:]: unrecognized selector sent to instance 0x1cee60'

Why?

Joshua Smith · Accepted Answer · 2011-06-09 17:08:23Z

6

This is because NSArray is immutable. Use an NSMutableArray.

edited Jun 9, 2011 at 17:08

answered Jun 9, 2011 at 16:51

Joshua Smith

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1 Comment

Chuck Over a year ago

Toll-free bridging does not mean what you appear to think. Simply casting an NSArray to NSMutableArray will not work.

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