Objective-C to Delphi bridge
Hi, Can someone explain the Wrap and OCCClass stuff? Is there a document or article that explains how we access Objective-C methods and vice-versa? It's a little confusing to me right now. Any info would be appreciated. Thanks, Joe
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Joe
8/1/2013 7:59:40 PM
embarcadero.delphi.firemonkey
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Joe Sansalone wrote: > Hi, > > Can someone explain the Wrap and OCCClass stuff? > Is there a document or article that explains how we access > Objective-C methods and vice-versa? If you must access an NSObject derivate (all Cocoa classes, etc.), you wrap them to get an interface with the name of the class. You can then call the instance methods like normal interface methods. To get at class methods, you call OCClass. So TNSColor.Wrap(someInstance) gets you an interface of type NSColor with the desired methods. But to call a class method, like blackColor, you call TNSColor.OCClass.blackColor. This returns an instance, so you wrap it to get an interface for it. The methods are, as far as I can see, being resolved by RTTI, so if you write an object of your own, say, a delegate, it is very important how you name your parameters. The names of parameters (except the first one) are used to construct the selector for the method. So to implement a method getString:withLength:andEncoding: you declare it: function getString(s: NSString; withLength: integer; andEncoding: NSStringEncoding); So the parameter names become the trailing parts of the method name. -- Rudy Velthuis (TeamB) http://www.teamb.com "It is dangerous to be right when the government is wrong." -- Voltaire
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Rudy
8/2/2013 7:45:01 AM
> {quote:title=Rudy Velthuis (TeamB) wrote:}{quote}
> Joe Sansalone wrote:
>
> > Hi,
> >
> > Can someone explain the Wrap and OCCClass stuff?
> > Is there a document or article that explains how we access
> > Objective-C methods and vice-versa?
>
> If you must access an NSObject derivate (all Cocoa classes, etc.), you
> wrap them to get an interface with the name of the class. You can then
> call the instance methods like normal interface methods. To get at
> class methods, you call OCClass.
>
> So TNSColor.Wrap(someInstance)
>
> gets you an interface of type NSColor with the desired methods. But to
> call a class method, like blackColor, you call
> TNSColor.OCClass.blackColor. This returns an instance, so you wrap it
> to get an interface for it.
>
> The methods are, as far as I can see, being resolved by RTTI, so if you
> write an object of your own, say, a delegate, it is very important how
> you name your parameters. The names of parameters (except the first
> one) are used to construct the selector for the method.
>
> So to implement a method
>
> getString:withLength:andEncoding:
>
> you declare it:
>
> function getString(s: NSString; withLength: integer; andEncoding:
> NSStringEncoding);
>
> So the parameter names become the trailing parts of the method name.
>
> --
> Rudy Velthuis (TeamB) http://www.teamb.com
>
> "It is dangerous to be right when the government is wrong."
> -- Voltaire
Thank you. This helped clarify what was going on with all these Wrap and OCClass calls.
Joe
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Joe
8/2/2013 2:50:06 PM
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