skipUntil

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

skipUntil - 图1

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

  1. let disposeBag = DisposeBag()
  3. let sourceSequence = PublishSubject<String>()
  4. let referenceSequence = PublishSubject<String>()
  6. sourceSequence
  7.     .skipUntil(referenceSequence)
  8.     .subscribe(onNext: { print($0) })
  9.     .disposed(by: disposeBag)
  11. sourceSequence.onNext("🐱")
  12. sourceSequence.onNext("🐰")
  13. sourceSequence.onNext("🐶")
  15. referenceSequence.onNext("🔴")
  17. sourceSequence.onNext("🐸")
  18. sourceSequence.onNext("🐷")
  19. sourceSequence.onNext("🐵")

输出结果：

  1. 🐸
  2. 🐷
  3. 🐵