Hi David,
It’s likely that we’ll have to come up with some alternative API in these
cases. For example, in NSProgress I could imagine a callback for progress
updates instead of observing the properties. It’s not ideal but I don’t think
we want to undertake a reinvention of KVO when we do not have the Objective-C
runtime present (so much of it relies on that dynamic behavior).
- Tony
> On Mar 14, 2016, at 4:14 PM, David Hart via swift-corelibs-dev
> wrote:
>
> I was looking through Foundation for stuff to do and saw NSProgress,
> NSExpression and NSSortDescriptor. They seem to be most reliant on KVC, and
> as KVC is not available without the Objective-C runtime, I’m not sure what
> those classes are doing here. Are those classes doomed to be dropped? Or is
> there another way to implement them?
>
> David.
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