callback using ReactiveSwift

signalProducerExample.swift

func job() -> SignalProducer<Int, NoError> {
    return SignalProducer<Int, NoError> { observer, disposable in
        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + .seconds(10)) {
            observer.send(value: 300)
            observer.sendCompleted()
        }
    }
}


job().on(value: { v in
    print(v)
}).on(completed: { 
    print("completed")
}).start()