Optional protocol methods in Swift

In Swift it’s kind of unsupported to implemented optional protocol methods.

You can, which is ugly, use the @objc syntax:

Master Test Distribution & App Releases Amid App Center’s ShutdownBitrise hosts a webinar on navigating the sunsetting of Microsoft’s Visual Studio App Center. Learn how to transition smoothly to alternative platforms, optimize test and store distributions, and prepare for the future of mobile app releases. The session also includes a sneak peek of Bitrise’s new tool designed to simplify distribution workflows. Watch it now for free.

@objc protocol MyProtocol {
    optional func doSomething();
}

class MyClass : MyProtocol {
    // no error
}

Another disadvantage here is that structs are unsupported, as you’re bridging for Objc.

Master Test Distribution & App Releases Amid App Center’s ShutdownBitrise hosts a webinar on navigating the sunsetting of Microsoft’s Visual Studio App Center. Learn how to transition smoothly to alternative platforms, optimize test and store distributions, and prepare for the future of mobile app releases. The session also includes a sneak peek of Bitrise’s new tool designed to simplify distribution workflows. Watch it now for free.

Using protocol extensions to create optional protocol methods

However, with Swift 2.0 it’s possible to define protocol extension. This allows you to create optional methods for your protocol easily:

protocol MyProtocol {
    func doSomethingNonOptionalMethod()
    func doSomethingOptionalMethod()
}

extension MyProtocol {
    func doSomethingOptionalMethod(){ 
        // leaving this empty 
    }
}

As stated in this thread, many people are asking this feature:
http://stackoverflow.com/questions/24032754/how-to-define-optional-methods-in-swift-protocol