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copied!<p>OK, this answer got all cluttered with edits. I've edited it to be more clear, at the possible expense of understanding the thread of how we arrived at the final answer.</p> <p><strong>The final answer</strong></p> <p>The answer was to change:</p> <pre><code>list=[NSMutableArray arrayWithArray:[self list].array]; </code></pre> <p>To:</p> <pre><code>list = [[NSMutableArray alloc] init]; </code></pre> <p>(...Which isn't really the best way to create an NSMutableArray, but it may work anyway.)</p> <p><strong>This was based on an erroneous version of the asker's code</strong></p> <p>Based on your comment that it crashes after <code>[list addObject:[self tem].array];</code>, I must conclude that your instance variable <code>list</code> is of type <code>Stack*</code>, and that Stack is not a subclass of NSMutableArray. If so, that's your issue.</p> <p>In that case, changing that line to <code>[[list array] addObject:[self tem].array];</code> should fix it.</p> <p><strong>This is just good advice</strong></p> <p>As an aside, NSMutable array is perfectly capable of acting as a stack without modification. Example:</p> <pre><code>NSMutableArray* ar = [NSMutableArray arrayWithCapacity:someCapacity]; // Push [ar addObject:narf]; // narf being some object reference // Pop id popped = [ar lastObject]; [ar removeLastObject]; </code></pre> <p>If you want to encapsulate stack behavior in a semantically consistent way, you can add push and pop methods to NSMutableArray using a category. This would make your code simpler and less prone to error.</p> <p><strong>This was my first stab at answering the question, before any code had been posted</strong></p> <p>This is a stab in the dark since you've not posted any code. BUT. One way to accomplish that with arrays is by creating arrays using <code>[NSArray arrayWithObjects:obj obj ... nil]</code> and omitting the nil terminator on the list of objects. Are you by any chance doing that?</p>

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