BehaviorReplay
BehaviorRelay is a wrapper for BehaviorSubject.
Unlike BehaviorSubject it can’t terminate with error or completed.
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public final class BehaviorRelay<Element>: ObservableType {
private let _subject: BehaviorSubject<Element>
/// Accepts `event` and emits it to subscribers
public func accept(_ event: Element) {
self._subject.onNext(event)
}
/// Current value of behavior subject
public var value: Element {
// this try! is ok because subject can't error out or be disposed
return try! self._subject.value()
}
/// Initializes behavior relay with initial value.
public init(value: Element) {
self._subject = BehaviorSubject(value: value)
}
/// 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