ReactiveCocoa创建一个可以手动发射的信号生成器

Question

我想在swift中使用ReactiveCocoa建模以下场景。

class A{
   let flagSignalProducer = A Signal Producer
   someSignal.takeUntil(a signal that I can trigger manually which is created out of flagSignalProducer).subscribeNext{ (_) in

   }
}

如何创建Signal Producer并将信号用作takeUntil输入信号并稍后手动触发信号。我这样做了吗？

Answer 1

制作一个可手动发射的信号，您可以使用Signal<(), NoError>.pipe()来获取信号＆＃34;观察者＆＃34;的参考，这将允许您手动发送信号上的事件

let (flagSignal, flagObserver) = Signal<(), NoError>.pipe()
someSignal.takeUntil(flagSignal).observeNext { _ in

}

//somewhere else, trigger the signal manually with the Observer
flagObserver.sendNext(())
flagObserver.sendCompleted() //complete the signal and free memory 

如果您因某种原因需要将flagSignal转换为SignalProducer，则可以使用SignalProducer构造函数，

let flagSignalProducer = SignalProducer(signal: flagSignal)