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POWhy is my property a potential leak and how can I fix it?
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  1. POWhy is my property a potential leak and how can I fix it?
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    copied!<p>I have a <strong>UIScrollView</strong> in my <strong>UIViewController</strong> defined as this in my .h file:</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @interface TestViewController : UIViewController &lt;UIScrollViewDelegate&gt; @property (nonatomic, retain) UIScrollView * imageScrollView; @end </code></pre> <p>Then in my .m file I have the following:</p> <pre><code>@synthesize imageScrollView = _imageScrollView; </code></pre> <p>I read that this will automatically create the _imageScrollView that I would normally type in the .h file? (UIScrollView * _imageScrollView)</p> <p>I like it, because it removes duplicate code from my .h files. Now in my <strong>loadView</strong> I do the rest:</p> <pre><code>self.imageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 480.0 - 20.0 - 49.0)]; [_imageScrollView setDelegate:self]; [_imageScrollView setPagingEnabled:YES]; [_imageScrollView setBounces:NO]; [_imageScrollView setShowsHorizontalScrollIndicator:NO]; [_imageScrollView setShowsVerticalScrollIndicator:NO]; [_imageScrollView setContentSize:CGSizeMake(320.0 * 3.0, 480.0 - 20.0 - 49.0)]; </code></pre> <p>And in the <strong>dealloc</strong> release and nil:</p> <pre><code>- (void)dealloc { [_imageScrollView release], _imageScrollView = nil; [super dealloc]; } </code></pre> <p>Now after a build Xcode is telling me this:</p> <pre><code>Potential leak of an object allocated on line #linenumber </code></pre> <p>This will go away when I change this:</p> <pre><code>self.imageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 480.0 - 20.0 - 49.0)]; </code></pre> <p>to this:</p> <pre><code>self.imageScrollView = [[[UIScrollView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 480.0 - 20.0 - 49.0)] autorelease]; </code></pre> <p>Why do I need to autorelease this when I'm release it in dealloc? What am I doing wrong?</p> <p>This memory warning only occurs in Xcode on my iMac with Lion installed, not on my macbook with snow leopard...</p>
 

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