I don’t remember exactly how I stumbled across this but thought it would be useful and maybe save someone else a few minutes of debugging. It’s also great to know how this bit of polymorphism is handled in Swift. If you create an object that conforms to a protocol method that is overridden you can still access the overridden behavior by specifying the protocol. That sounds more complicated than it is, just take a look at this trivial and contrived code:
Considering the push toward protocol oriented design I can only imagine this will be cropping up over time.
Brian's Blog 