[swift-evolution] [Draft] Allow declaration of abstract functions and properties on classes

Pierre Monod-Broca pierre at monod-broca.fr
Fri Feb 26 07:52:42 CST 2016

Well not exactly, if you want the same behaviors in subclasses of UIViewController and UITableViewController :
 - with protocols + extensions, you write in once and apply it to each of your subclasses
 - with abstract classes you have to write 2 abstract classes, one for direct UIViewController subclasses, one for UITableViewController subclasses

> Le 26 févr. 2016 à 12:07, Alex Hoppen via swift-evolution <swift-evolution at swift.org> a écrit :
>> You're right that this is currently somewhat convoluted (and someone else mentioned that the extension members may not override the inherited ones, which is obviously another problem). But I think protocols are actually pretty close to what you want already, and we're better off extending them to cover abstract class use cases than extending classes.
> I am curious to see a way that protocols can override existing methods, since the protocols are always at the top of the inheritance chain and putting them anywhere else makes them abstract classes by definition.
> – Alex
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