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Asked: 2026-06-12T23:47:57+00:00

I want to render PDFs on iOS and I’m getting a memory leak when

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I want to render PDFs on iOS and I’m getting a memory leak when I call CGPDFDocumentCreateWithURL(). I know this issue has been discussed before, but I don’t know whether my conditions are different because I’m using ARC.

I’ve extracted and simplified the problem by running the following code on my viewDidLoad:

// Bridge resourceRef to ARC with no ownership change (still owned by ARC)
CFURLRef resourceRef = (__bridge CFURLRef) [NSURL fileURLWithPath:htmlPath];

CGPDFDocumentRef pdf;
pdf = CGPDFDocumentCreateWithURL(resourceRef);
CGPDFDocumentRelease(pdf);

// Do not need to release resourceRef because ARC will release it

Instruments tells me that the Leaked Object is a Malloc 48 Bytes, responsible by CoreGraphics. And the stacktrace has CGPDFDocumentCreateWithURL in it. Leaking means that there is object out there without an owner.

I’ve create a git repo with a replication of the problem:
https://github.com/indika/PDFLeaks

Any ideas. Would appreciate any help or ‘pointers’.

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1 Answer

  1. Editorial Team

    I made many mistakes, especially with double releasing the document reference. However, that wasn’t the real critter in my situation.

    I was loading a broken PDF! I was using pdftk to slice and merge pdf documents, and I was breaking the indexes. So remember, after merging a PDF with pdftk, repair the file with:

    pdftk original output destination
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