Question

我在项目中使用ReactiveSwift，但我想知道PublishSubject的等效功能是什么？

例如在RXSwift中，我们可以做到：

let disposeBag = DisposeBag()

let pubSubj = PublishSubject<String>()

pubSubj.on(.next("(next 1")) //event emitted to no subscribers

pubSubj.subscribe({ //subscriber added, but no replay of "next 1"
                print("line: \(#line),", "event: \($0)")
            })
.disposed(by: disposeBag)

pubSubj.on(.next("(next 2")) //event emitted and received by subscriber
pubSubj.onError(MyError.error1) //emits error and terminates sequence

pubSubj.on(.next("next 3")) //pubSubj cannot emit this event
/* prints: 
line: 8, event: next((next 2)
line: 8, event: error(error1) 
*/

Answer 1

ReactiveSwift没有像Subject这样的单一类型，它既可以作为信号的输入，也可以作为信号的输出。相反，您可以使用Signal.pipe()创建输入及其相应的输出信号：

import ReactiveSwift

enum MyError: Error { case error1 }

let (lifetime, token) = Lifetime.make()

let (signal, input) = Signal<String, MyError>.pipe()

input.send(value: "1")

signal
    .take(during: lifetime)
    .observe {
        print("line: \(#line),", "event: \($0)")
    }

input.send(value: "2")
input.send(error: .error1)

input.send(value: "3")

/* prints:
line: 14, event: VALUE 2
line: 14, event: FAILED error1
*/

ReactiveSwift中的PublishSubject等效于什么？

1 个答案: