Created
August 7, 2021 06:19
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Two Rx Steam
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import RxSwift | |
import RxCocoa | |
func ignoreNil<A>(x: A?) -> Observable<A> { | |
return x.map { Observable.just($0) } ?? Observable.empty() | |
} | |
var stream: BehaviorRelay<String?> = BehaviorRelay(value: nil) | |
var streamA: BehaviorRelay<String?> = BehaviorRelay(value: nil) | |
var streamB: BehaviorRelay<String?> = BehaviorRelay(value: nil) | |
var streamC: BehaviorRelay<String?> = BehaviorRelay(value: nil) | |
let bag = DisposeBag() | |
stream | |
.flatMap(ignoreNil) | |
.distinctUntilChanged().subscribe(onNext: { stream in | |
print(stream) | |
}).disposed(by: bag) | |
stream | |
.flatMap(ignoreNil) | |
.distinctUntilChanged() | |
.withLatestFrom( | |
BehaviorRelay.combineLatest( | |
streamA | |
.flatMap(ignoreNil) | |
.distinctUntilChanged(), | |
streamB | |
.flatMap(ignoreNil) | |
.distinctUntilChanged(), | |
streamC | |
.flatMap(ignoreNil) | |
.distinctUntilChanged() | |
) | |
) | |
.subscribe(onNext: { A, B, C in | |
print(A) | |
print(B) | |
print(C) | |
}).disposed(by: bag) | |
streamA.accept("A") | |
streamB.accept("B") | |
streamC.accept("C") | |
stream.accept("Trigger") | |
/* result | |
Trigger | |
A | |
B | |
C | |
*/ |
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