Here’s an open source library from Alec Larson providing a Swift based alternative to NSNotificationCenter with a very clean and simple syntax.

This example from the readme shows how simple it is to create a generic emitter with EmitterKit:

let didLogin = Event()

didLogin.once { user in
  println("Successfully logged in as \(user.name)!")


The advantages of EmitterKit as stated in the readme include:

  • No longer be forced to typecast event data in your closures.
  • No longer be forced to removeObserver in your classes’ deinit methods.
  • Backwards-compatible with NSNotificationCenter (like UIKeyboardWillShowNotification)!
  • Simpler syntax

You can find Emitter-Kit on Github here.

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