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when i'm trying to build my project I have a new error where objc_retainedObject() is used.

I have the error message objc_retianedObject is unavailable: use CFBridgingRelease() or a (__bridge_transfer id) cast instead.

I replaced the usages of objc_retainedObject() by CFBridgingRelease and there are no longer errors and I can run the app, but when the app is going to display my QRCode-scanning view, it crashed without messages.

It is the same when I put #define objc_retainedObject(o) ((__bridge_transfer id)(objc_objectptr_t)(o)) which was supposed to be a solution. I believe that it is an XCode configuration or a missing library problem. Any ideas?

Joel Brewer
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Louis Fovet
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1 Answers1

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Do not recreate objc_retainedObject. It was removed on purpose. CFBridgingRelease and CFBridgingRetain are the correct tools for moving CF objects into ARC. (__bridge is the tool for dealing with CF objects that you don't need to transfer to ARC because you aren't storing them.)

If your program is crashing, you're probably managing memory incorrectly. It is likely that objc_retainedObject was incorrect (even if you happened to get away with it). See when should you use __bridge vs. CFBridgingRelease/CFBridgingRetain? for correct memory management when transferring CF objects to ARC.

Without knowing more about the code, I can't guess exactly where you've made a mistake, but you probably are calling CFBridgingRelease on an object that you didn't acquire via the Create Rule. You don't just throw CFBridgingRelease on every CF object you encounter. You need to make sure you're balancing an existing retain.

Community
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Rob Napier
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