Protocol optional
In Swift, while protocol requirements are usually mandatory, you can create optional requirements by mixing in some Objective-C flavor. This is done by importing the Foundation framework, marking your protocol with the @objc attribute, and then specifying optional methods or properties with @objc optional. This approach allows types conforming to the protocol to choose whether or not to implement these optional elements. Remember, this utilizes Objective-C runtime features, so it's a bit of a hybrid approach in a Swift environment. Use this feature judiciously to keep your protocols clear and maintain the Swift-like feel in your code.
