What does "Receiver type 'CALayer' for instance message is a forward declaration" mean here?

objective-c ios core-animation calayer automatic-ref-counting
Jason George picture Jason George · Oct 18, 2011 · Viewed 30.5k times · Source

I'm porting a block of code from an iOS4 project to iOS5 and I'm having some troubles with ARC. The code generates a PDF from a screen capture.

PDF Generation Code

UIView *captureView;
...
NSMutableData *pdfData = [NSMutableData data];
UIGraphicsBeginPDFContextToData(pdfData, captureView.bounds, nil);
UIGraphicsBeginPDFPage();
CGContextRef pdfContext = UIGraphicsGetCurrentContext();
[captureView.layer renderInContext:pdfContext];
UIGraphicsEndPDFContext();

The renderInContext line

[captureView.layer renderInContext:pdfContext];

generates the following error.

Automatic Reference Counting issue
Receiver type 'CALayer' for instance message is a forward declaration

Any ideas what is going on here?

Answer

NJones picture NJones · Oct 18, 2011

I was able to duplicate your problem. This is what fixed it for me.

Add QuartzCore.framework to your project and this line to your .m file.

#import <QuartzCore/QuartzCore.h>

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