When I do that, Xcode helpfully informs me that I have not yet implemented one of the required methods in that protocol, and I can tap the issue and accept the Fix-it to add the protocol step.

我这样做时 Xcode 就会通知我我还没有履行协议要求必须使用的某个方法，我可以点击这个错误，接受 Fix-it来添加协议步骤。