Re: Strange XCode Warning
Re: Strange XCode Warning
- Subject: Re: Strange XCode Warning
- From: Kyle Sluder <email@hidden>
- Date: Tue, 15 Sep 2015 12:52:13 -0500
On Tue, Sep 15, 2015, at 12:23 PM, Jens Alfke wrote:
>
> > On Sep 15, 2015, at 9:19 AM, Dave <email@hidden> wrote:
> >
> > Class<ProtocolX> was allowable and would cause the compiler to generate a warning if “MyClass” does not conform to “ProtocolX”, e.g.
>
> I’ve never seen that used before … which doesn’t prove it isn’t real, but
> I’m suspicious. Have you tested whether it actually triggers such a
> warning?
>
> > This fixes it:
> >
> > if ([(Class)theDetailViewClass conformsToProtocol:@protocol(LTWDetailViewProtocol)] == NO)
>
> Yeah, that would imply that the compiler sees “Class<ProtocolX>” as an
> instance type, not a class.
Class<ProtocolX> really is a Class (instance of metaclass). Check out
UIAppearance.h; that's how containment-based appearance works.
--Kyle Sluder
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