SwiftEventBus.onMainThread(target, name: "someEventName") { result in
    // UI thread
}
// or
SwiftEventBus.onBackgroundThread(target, name:"someEventName") { result in
    // API Access
}

SwiftEventBus.post("someEventName")

SwiftEventBus.post("personFetchEvent", sender: Person(name:"john doe"))

SwiftEventBus.onMainThread(target, name:"personFetchEvent") { result in
    let person : Person = result.object as Person
    println(person.name) // will output "john doe"
}

@IBAction func clicked(sender: AnyObject) {
     count++
     SwiftEventBus.post("doStuffOnBackground")
 }
 @IBOutlet weak var textField: UITextField!
 var count = 0
 override func viewDidLoad() {
     super.viewDidLoad()
     SwiftEventBus.onBackgroundThread(self, name: "doStuffOnBackground") { notification in
         println("doing stuff in background thread")
         SwiftEventBus.postToMainThread("updateText")
     }
     SwiftEventBus.onMainThread(self, name: "updateText") { notification in
         self.textField.text = "\(self.count)"
     }
}
//Perhaps on viewDidDisappear depending on your needs
override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    SwiftEventBus.unregister(self)
}

SwiftEventBus.unregister(target)

SwiftEventBus.unregister(target, "someEventName")