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POARC-aware UIImage from UIView
 

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  1. POARC-aware UIImage from UIView
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    <p>My application iterates through a directory of PDF-files, draws there first page into a off-screen UIView subclass using the CGPDF API functions, which makes a UIImage available to the application. The UIView subclass simply adds the <em>@property (nonatomic,assign) image</em>, which in its setter uses the standard way to get a UIImage from a UIView, as per Apple references.</p> <p>UIViewWithImage.h:</p> <pre><code>@interface UIViewWithImage : UIView { UIImage* image; } @property (nonatomic,strong) UIImage* image; @end </code></pre> <p>UIViewWithImage.m:</p> <pre><code>@implementation UIViewWithImage @dynamic image; -(UIImage*)image { if( [self.layer respondsToSelector:@selector(setShouldRasterize:)]) UIGraphicsBeginImageContextWithOptions( self.bounds.size, NO, self.contentScaleFactor ); else UIGraphicsBeginImageContext(self.bounds.size); [self.layer renderInContext:UIGraphicsGetCurrentContext()]; image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image; } @end </code></pre> <p>So far, so good. My application uses ARC (automatic reference counting) and crashes in this method, short after memory warnings are received. There is no exception thrown, instruments was not of great help as I could not observe memory accumulations. Only removing the code from the setter saves the app from crashing.</p> <p>I have read a lot about bridging, which seems not applicable in my case. It seems to me that the code above allocates objects and never frees them, at least that will explain the memory warnings.</p> <p>Any help is appreciated.</p>
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    1. USdev.microfunk
    1. USdev.microfunk
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      1. VTUpMod
    1. COUse `weak` or `strong` properties, and you should be good.
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      1. POARC-aware UIImage from UIView
      1. USRichard J. Ross III
    2. COThanks Brad. You mean I should change the `@property (nonatomic,assign)` to `@property (nonatomic,strong)`?
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      1. USdev.microfunk
    3. CO@dev.microfunc either that or weak, it's hard to say based on the limited design points you have given us
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      1. POARC-aware UIImage from UIView
      1. USRichard J. Ross III
 

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