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POIs there a way to "find mystery retains" ...?
 

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  1. POIs there a way to "find mystery retains" ...?
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    <p>Recently I was repairing someone's code. There was a big class that would not dealloc. You'd have to hit it with 5 or 6 releases to get it to dealloc.</p> <p>I carefully looked through the big class and eventually found the various things that needed to be released.</p> <p>This got me thinking: <strong>there just has to be some really easy way to "find" all the retains on an object</strong> .. am I right?</p> <p>So, is there a simple way to <strong>"find all the retains"</strong> on an object? Is there a button in XCode or Instruments that everyone else knows about?</p> <p>What do you do when you can't find a mystery retain like that?</p> <p>So in the iOS universe, if anyone knows the <strong>"Show where all the retains came from on this object"</strong> button -- thanks!</p> <p><strong>P.S. Note that there is no leak, and this question is totally unrelated to leaks.</strong> The object simply "perfectly correctly" wouldn't release.</p> <hr> <p>Later ..</p> <h1>Truly astounding solution by Fabio:</h1> <p>Fabio has provided an astounding solution to this problem. In nine words, here it is:</p> <pre><code>-(id)retain { NSLog(@"%@", [NSThread callStackSymbols]); return ([super retain]); } </code></pre> <p>That is amazingly useful in many situations and leads to many other useful things. You've probably saved me two man-weeks of work per annum forever, Fabio. Thanks!</p> <p>BTW if you're just getting to grips with this and struggling with the output, I saw that typically there will be many chunks featuring "UINib instantiateWithOwner:". It looks like those will come first, the significant chunks will follow.</p>
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    1. COOf course the `CADisplayLink` retains the object. [The documentation says so](http://developer.apple.com/library/ios/#documentation/QuartzCore/Reference/CADisplayLink_ClassRef/Reference/Reference.html): "The newly constructed display link retains the target." To get that retain to go away, you have to `invalidate` the `CADisplayLink`.
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    2. COInteresting, non-trivial question (+1). The best is the first sentence ;-)
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