RxSwift (8) 错误处理

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catchErrorJustReturn

发送错误信号的时候，转换为指定的信息发送

func rx_catchErrorJustReturn() {    let disposeBag = DisposeBag()    let sequenceThatFails = PublishSubject<String>()    sequenceThatFails        .catchErrorJustReturn("haveError is timeout")        .subscribe { print($0) }        .disposed(by: disposeBag)    sequenceThatFails.onNext("1")    sequenceThatFails.onNext("2")    sequenceThatFails.onNext("3")    sequenceThatFails.onNext("4")    sequenceThatFails.onError(RxError.timeout)}

打印结果：next(1)next(2)next(3)next(4)next(haveError is timeout)completed

catchErrorJustReturn

发生错误，返回另一个序列继续订阅

func rx_catchError() {    let disposeBag = DisposeBag()    let sequenceThatFails = PublishSubject<String>()    let recoverySequence = PublishSubject<String>()    sequenceThatFails        .catchError {            print("Error:", $0)            return recoverySequence        }        .subscribe { print($0) }        .disposed(by: disposeBag)    sequenceThatFails.onNext("1")    sequenceThatFails.onNext("2")    sequenceThatFails.onNext("3")    sequenceThatFails.onNext("4")    sequenceThatFails.onError(TestError.test)    recoverySequence.onNext("5")}

打印结果next(1)next(2)next(3)next(4)Error: test//发生错误信号，切换序列继续订阅next(5)

retry

遇见error事件进行重试，retry(3)重试3次，retry()无参重试一次

func rx_retry() {    let disposeBag = DisposeBag()    var count = 1    let sequenceThatErrors = Observable<String>.create { observer in        observer.onNext("1")        observer.onNext("2")        observer.onNext("3")        if count == 1 {            observer.onError(TestError.test)            print("Error encountered")            count += 1        }        observer.onNext("4")        observer.onNext("5")        observer.onNext("6")        observer.onCompleted()        return Disposables.create()    }    sequenceThatErrors        .retry()        .subscribe(onNext: { print($0) })        .disposed(by: disposeBag)}/*: ---- ## `retry(_:)`Recovers repeatedly from Error events by resubscribing to the `Observable` sequence, up to `maxAttemptCount` number of retries. [More info](http://reactivex.io/documentation/operators/retry.html) ![](https://raw.githubusercontent.com/kzaher/rxswiftcontent/master/MarbleDiagrams/png/retry.png) */

打印结果123Error encountered123456

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