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PONSAutoreleasePool drain releases +1 more than the number of sent autorelease messages
 

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    <p>I've been having trouble debugging an iPhone app that crashes in a reproducible way.</p> <p><strong>Short story:</strong> A custom <code>UIViewController</code> is allocated and pushed onto a <code>UINavigationController</code>'s stack. Some time later the <code>UIViewController</code> is poped from the stack. The very next push of a <code>UIViewController</code> onto the stack crashes the app.</p> <p>The standard procedure for any crash is using the Instruments with <code>NSZombie</code> enabled. Upon inspection of the object's history some is revealed that I fail to understand:</p> <ul> <li>the object receives 2 (two) <code>autorelease</code> messages and</li> <li>the <code>NSAutoreleasePool</code>'s drain method send 3 (three) release messages</li> </ul> <p>So far, the only way to prevent crashes is to NOT send 1 (one) release message to the object in question and thus raising a red flag for memory leaks, only that it doesn't leak.</p> <p>Is there any other solution that I've overlooked?</p> <p><strong>Update:</strong> As one of you pointed out the obvious: </p> <blockquote> <p>You have a problem in your code. Nothing to do with autorelease pool drain.</p> </blockquote> <p>It turned out that the first <code>UIViewController</code> was passed as a delegate to the <code>UINavigationController</code> hence my confusion when the <code>Zombie</code> call was coming from the navigation controller itself. </p> <p>I should me more careful next time before asking the wrong question.</p>
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    1. USene.andrei
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    1. COI think you should go ahead and try ARC (automatic reference counting) and @autoreleasepool introduced by Apple in iOS5 and Lion. It's only a few days before iOS 5 goes into production, and Lion is already there.
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    2. COShort answer: You have a problem in your code. Nothing to do with autorelease pool drain.
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      1. USARC
    3. COThe normal way is: 1. allocate viewcontroller 2. push it onto a navigation controller 3. release it. For what do you need autorelease?
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      1. USott--
 

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