skipUntil

跳过 Observable 中头几个元素，直到另一个 Observable 发出一个元素

skipUntil 操作符可以让你忽略源 Observable 中头几个元素，直到另一个 Observable 发出一个元素后，它才镜像源 Observable。

演示

let disposeBag = DisposeBag()

let sourceSequence = PublishSubject<String>()
let referenceSequence = PublishSubject<String>()

sourceSequence
    .skipUntil(referenceSequence)
    .subscribe(onNext: { print($0) })
    .disposed(by: disposeBag)

sourceSequence.onNext("🐱")
sourceSequence.onNext("🐰")
sourceSequence.onNext("🐶")

referenceSequence.onNext("🔴")

sourceSequence.onNext("🐸")
sourceSequence.onNext("🐷")
sourceSequence.onNext("🐵")

输出结果：

🐸
🐷
🐵