Re: Subclassing/Override question

Thanks Jens and Peter, got it now. All the Best Dave ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Re: Subclassing/Override question

Method return types are covariant though, yes? So you should always be able to return a more-derived type from a method that is declared to return a less-derived type. If I read your example right, ClassA is "Animal" and ClassB is "Cat" (in covariance-blog-post lingo). So that is legal, unless I'm

Re: Subclassing/Override question

> On Jan 4, 2016, at 8:24 AM, Dave wrote: > > myClassB = myClassA.propA;//Warning on this line saying > return type is not ClassB You have to declare the override in the subclass’s @interface, with the modified return type. Otherwise callers have

Subclassing/Override question

Hi, In Objective-C, is it possible to override a property and have it return a different type to the base class? I have a base class with the following property defined: @property (nonatomic,retain)ClassA* propA; and the following getter: -(ClassA*) propA

Re: Subclassing/Override question

Hi Dave, For myClassA, you will always have to cast the return value to myClassB if you know that’s what will be returned. For a great blog post on the subject, I give you Mike Ash: https://mikeash.com/pyblog/friday-qa-2015-11-20-covariance-and-contravariance.html Jeff Kelley