PublishRelay
PublishRelay is a wrapper for PublishSubject.
Unlike PublishSubject it can’t terminate with error or completed.
- 作为observable, 可以订阅给subject
- 可以通过subject发送next给observers
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public final class PublishRelay<Element>: ObservableType {
private let _subject: PublishSubject<Element>
// Accepts `event` and emits it to subscribers
public func accept(_ event: Element) {
self._subject.onNext(event)
}
/// Initializes with internal empty subject.
public init() {
self._subject = PublishSubject()
}
/// Subscribes observer
public func subscribe<Observer: ObserverType>(_ observer: Observer) -> Disposable where Observer.Element == Element {
return self._subject.subscribe(observer)
}
/// - returns: Canonical interface for push style sequence
public func asObservable() -> Observable<Element> {
return self._subject.asObservable()
}
}
References
注：文中源码来自RxSwift