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Re: ARC + return of autoreleased CFType
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Re: ARC + return of autoreleased CFType


  • Subject: Re: ARC + return of autoreleased CFType
  • From: Wade Tregaskis <email@hidden>
  • Date: Wed, 19 Oct 2011 10:52:15 -0400

> Following Cocoa convention you'd want to cast it to what and autorelease it? CGColorRef isn't toll-free bridged with anything. If you have been casting it to id and autoreleasing it you might have gotten away with that before but I don't think it's documented anywhere you can do that with CFTypes in general.

You can.  It may not be in the docs, but all CF types are also NSObjects (or a subclass thereof).

> You could change the semantics of the method to return a CFRetain()ed object and make it the responsibility of the caller to release it (and change the name of the method too to make it clear) or you can create a UIColor with your CGColorRef, then CFRelease() it and return the UIColor.
>
> Mixing autorelease and CFTypes does't seem like a great idea, but I'm prepared for someone to point out a whole piece of documentation I've never seen, that often seems to happen!

No, mixing them is indeed a bad idea.  CF doesn't have auto release pools, so anything dealing with CF types is free to not think about them, and in practice often does.  I would go with explicitly returning the CGColorRef retained.
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References: 
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 >Re: ARC + return of autoreleased CFType (From: Roland King <email@hidden>)

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