如何在ReactiveKit中使用ReplaySubject

Question

我在RxSwift中有这样的代码：

func foo() -> Observable<Int> {
    let subject = RxSwift.ReplaySubject<Int>.create(bufferSize: 1)
    return subject.asObservable()
}

如何在ReactiveKit中实现相同的概念？

Answer 1

使用当前处于测试版(rk3分支)的ReactiveKit 3，您可以执行以下操作：

func foo() -> Signal<Int, NoError> {
  let subject = ReplaySubject<Int, NoError>(bufferSize: 1)
  return subject.toSignal()
}

在ReactiveKit 2中，ReplaySubject是对事件的泛化：

func foo() -> Stream<Int> {
  let subject = ReplaySubject<StreamEvent<Int>>(bufferSize: 1)
  return Stream(rawStream: subject.toRawStream())
}

或

func foo() -> Operation<Int, Error> {
  let subject = ReplaySubject<OperationEvent<Int>>(bufferSize: 1)
  return Operation(rawStream: subject.toRawStream())
}