How do I refactor Swift in Xcode?

As of Xcode 7.2 beta the refactoring tools do not support Swift.

What I do is use the type checker. Change the name/type of something and then fix all the compile breakages. Because of the strong typing you can have more confidence that this approach will catch everything. I have at times deliberately changed things and broken them temporarily to check where objects or types are used or accessed from.

Or use AppCode for the refactoring, I hear it is good but haven't tried much myself.

Xcode 9 - 10

Xcode 9 now supports refactoring in Swift. This was announced in WWDC 2017.

AFAIK the refactoring is not working with Swift right now, however, at least in the same file(scope), you can do the following:

The lack of refactoring is astounding (especially as I am coming off of a major stint using VS) However I have just noticed that someone has done something about it. On GitHub there is Refactorator Xcode Plugin (MIT license) which claims:

Refactorator is an Xcode plugin for refactoring Swift & now Objective-C code. It will rename public or internal vars, functions, enums etc. For private and local entities use Xcode's existing "Edit All in Scope" functionality.

Full disclosure is that I have nothing to do with them and am just about to install the product myself.