> On Jan 6, 2017, at 9:32 PM, Charles Jenkins <cejw...@gmail.com> wrote:
> 
>   - If I imitate the ObjC version and try to do the bindings in IB, the
>   time slider’s maxValue and value bindings don’t work (won’t compile)
>   because duration and currentTime are not NSNumbers.

They don’t have to be NSNumbers; KVO automatically wraps primitive number types 
in NSNumbers for you. What do you mean by “won’t compile”? IB and KVO all occur 
at runtime, not compile-time.

Anyway, the thing to make sure about is that you’ve declared all KVO-compliant 
properties with the ‘dynamic’ keyword. If you haven’t, that could easily 
account for things not working properly.

Charles

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