Core Graphics memory leaks while displaying pdf images - ios

Question

I have a subclass of UIImageView view that loads pdf image data, so that I can have a resolution independent graphic in my view. Works well for the stated purpose, but I am getting memory leaks with this, according to an instruments leaks profile.
Here is the code below that I believe should be responsible for the leaks. I am trying to track down the problem, but I am a little foggy on how to pinpoint the issue.
- (id)initWithPDFResourceAtPath:(NSString *)path center:(CGPoint)center {
if ((self = [super init])){
CGPDFPageRelease(pageRef);
CGPDFDocumentRef documentRef = CGPDFDocumentCreateWithURL((__bridge CFURLRef)[NSURL fileURLWithPath:path]);
pageRef = CGPDFDocumentGetPage(documentRef, 1);
CGPDFPageRetain(pageRef);
CGPDFDocumentRelease(documentRef);
[self setBounds];
}
return self;
}
-(void)setBounds {
[self setBounds:CGRectApplyAffineTransform(CGPDFPageGetBoxRect(pageRef, kCGPDFMediaBox), CGAffineTransformMakeScale(scaleH, scaleV))];
size = self.bounds.size;
[self getPDFimage];
}
-(void)getPDFimage {
UIGraphicsBeginImageContextWithOptions(size, NO, 0.0);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextScaleCTM(context, scaleH, scaleV);
CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
CGContextSetRenderingIntent(context, kCGRenderingIntentDefault);
CGContextDrawPDFPage(context, pageRef);
[self setImage:UIGraphicsGetImageFromCurrentImageContext()];
}

Answer 1

You forgot to call UIGraphicsEndImageContext(). Change your code to:
UIImage *image = [self setImage:UIGraphicsGetImageFromCurrentImageContext()];
UIGraphicsEndImageContext();
return image;
EDIT1: your code has this pageRef variable - is it an ivar or a static? If an ivar you better release it with CGPDFPageRelease() in the dealloc method. [It really should be an ivar]
EDIT2: See attached screen shot on Object Alloc. You can see the type and current amount and its ordered from most to least.
EDIT3: all else fails create a demo project that has the same problem and post it on Dropbox.
EDIT4: Code was uploaded to: here (I cannot look at it til May 28th)
EDIT5: The problem is that pageRef is not ever released. So:
1) remove this from your init method, as it does nothing:
CGPDFPageRelease(pageRef);
2 and move it to a new dealloc method:
- (void)dealloc
{
CGPDFPageRelease(pageRef);
}