Basic example of how to handle delegate patterns in ReactiveCocoa, Swift

SignalConsumer.swift

self.myDisposable = provider.mySignal.subscribeNext({(someObject) -> RACSignal! in
    // do anything you want
    return nil
})

// if you want to unsubscribe, then
self.myDisposable.dispose()

// this is like we usually nilify delegate, but such explicit memory management is always a bad thing
// there should be some better practice I believe

SignalProvider.swift

private let __mySignal: RACSubject = RACSubject()
var mySignal: RACSignal {
  get {
    return self.__mySignal
  }
}

override func someDelegate(sender: SomeSenderClass) {
  self.__mySignal.sendNext(someObject)
}