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POCorrect way to handle CGImageRef in containers under ARC
 

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  1. POCorrect way to handle CGImageRef in containers under ARC
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    <p>I am new to incorporating arc in my projects. I am trying to understand __bridge and its little friends so that I can properly cast my CGImageRef's when adding and removing them from containers. </p> <p>I am getting a "Potential leak of an object stored…" on one of my lines. Here is the basic cycle of my code: </p> <pre><code>CGImageRef renderedRef = CGBitmapContextCreateImage(UIGraphicsGetCurrentContext()); [_array addObject: (__bridge_transfer id)renderedRef];//_array is an iVar </code></pre> <p>then somewhere down the road I do this:</p> <pre><code> CGImageRef iRef = (__bridge_retained CGImageRef)array[0]; //then I do something fancy with iRef //at the end of the method, I get "Potential leak of an object stored…" //I have no idea what to do //I've tried CGImageRelease(iRef); but it still doesn't change the warning. </code></pre> <p>Can someone shed some light on this? Also, I have tried just using __bridge but that doesn't make a difference.</p> <p><strong>Edit 1:</strong></p> <p>I expanded the analyzer results and followed what was happening. It was because I was using iRef in a method like so: [self doSomethingFancy:iRef]; and in that method, iRef was being retained but not released. So that fixes the warning, but I'm still a bit puzzled.</p> <p>I am not quite clear on when to use the various __bridge casts. Under ARC, does the following increase the reference count?</p> <pre><code>CGImageRef iRef = (__bridge CGImageRef)array[0]; </code></pre> <p>Also, at some point if I tell my _array iVar to removeAllObjects, will that decrement their reference counts properly? </p>
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    1. USdaveMac
    1. USdaveMac
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    1. CO`CGImageRelease(iRef)` is correct here. If you still have a warning, click on the blue icon to get a detailed report about what the Analyzer thinks.
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      1. USMartin R
    2. CO@MartinR I updated my question to reflect my findings.
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      1. USdaveMac
 

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