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iosswiftcgimage

CGImageRelease in Swift

In Objc I use CGImageRelease method after the treatment of an image. But in Swift this method is not available.

On the Apple documentation after Retaining and Releasing Images there is a 2 Objective-C symbols hidden

My question is, why is there no more CGImageRelease in Swift ? And have we to call another method to replace it ?

Thanks !

Solution

  • CGImage is now managed by ARC. CGImageRelease() is no longer required on it. You can know this by looking in CGImage.h and noting that it includes the macro CF_IMPLICIT_BRIDGING_ENABLED. This indicates that Apple has audited this file to make sure it conforms to memory-management naming conventions so ARC can memory manage objects returned from functions in this file.

    EDIT: I was reading over this and realized I was misleading. I don't mean to say that CGImageRelease isn't needed in ObjC (which is pretty much what I implied here…) I just mean that because of the auditing, Swift is able to handle it. In ObjC code, you still need to release these objects.