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 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!
On Oct 19, 2011, at 9:04 PM, John Pannell wrote:
> Hi all-
>
> I've got a category on NSColor to return a CGColor value. Source looks like
> this:
>
> - (CGColorRef)CGColor
> {
> NSColor *colorRGB = [self
> colorUsingColorSpaceName:NSCalibratedRGBColorSpace];
> CGFloat components[4];
> [colorRGB getRed:&components[0] green:&components[1] blue:&components[2]
> alpha:&components[3]];
> CGColorSpaceRef theColorSpace =
> CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
> CGColorRef theColor = CGColorCreate(theColorSpace, components);
> CGColorSpaceRelease(theColorSpace);
> return theColor;
> }
>
> My issue is with the final line: the CGColor has a retain count of 1, as it
> was made with a "Create" function. Following Cocoa convention, I'd want to
> cast the return value and autorelease it, but the autorelease call is not
> allowed under ARC. Xcode is doing its best to help me figure out how to
> return the value, but the only thing I can get it to not squeak about is this:
>
> return (__bridge_retained CGColorRef)(__bridge_transfer id)theColor;
>
> which does not seem reasonable to me. Can anyone suggest the proper syntax
> to return an "autoreleased" CGColorRef from this function?
>
> Thanks!
>
> John
>
>
> John Pannell
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