I've now found an acceptable solution.
Rather than a property I've added an optional method to the protocol which then
in its implementation assigns using the property, pretty much to make sure that
the function/block is copied. I declared the method like so:
-(void)applyMyCreateImageFunction:(CGImageRef (^)(NSDictionary
*))createImageFunction
And when calling it from the swift code I call it like so:
imageProvider.applyMyCreateImageFunction?(makeImage)
The question mark was necessary to evaluate whether the optional protocol
method had been implemented or not.
Kevin
On 18 Oct 2014, at 18:18, Kevin Meaney <[email protected]> wrote:
> Hi Roland,
>
> Thanks for the followup. I've created a proper git rep on github rather than
> just a gist. Most of my github reps seem to be this kind of mini
> demonstration project and I was trying to avoid yet another one.
>
> https://github.com/SheffieldKevin/swift-objectivec
>
>> What version of Xcode are you using by the way, Swift is so flux-y at the
>> moment it probably makes a difference.
>
> I'm now running release Yosemite and release Xcode 6.1. That appears to me to
> make no difference.
>
> I still can't assign to the optional property of my protocol.
>
> You can ignore the ImageProvider2 class, I've just included it for
> completeness. It doesn't have a protocol and just declares the property
> itself.
>
> So with my protocol I've done something similar to what you did if I've
> interpreted your discussion correctly. I've got two properties, one that is
> required and one that is optional.
>
> Everything works fine for the required property. But I still can't get the
> optional one to work.
>
> In ImageProvider.m you'll see that the MakeImageProvider function assigns a
> block to the optional property and in SupplyCreateImage.swift I've commented
> out the assignment. I've provided the example this way so that it can be seen
> that it works when done using objective-c. But if you comment out the
> assignment to the optional property of the block, and uncomment the line in
> the swift file you'll see that the command line tool no longer compiles.
>
> Like you I've tried the use of the optional and playing around with casting
> but I've not actually got the code to compile this way.
>
> Kevin
>
>
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