RxSwift 系列(八) -- Error Handing Operators

let disposeBag = DisposeBag()
    
let sequenceFail = PublishSubject<String>()
    sequenceFail.catchErrorJustReturn("?").subscribe(onNext: {print($0)}).disposed(by: disposeBag)
    
sequenceFail.onNext("?")
sequenceFail.onNext("?")
sequenceFail.onError(TestError.test)

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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("?")
sequenceThatFails.onNext("?")
sequenceThatFails.onNext("?")
sequenceThatFails.onError(TestError.test)
    
recoverySequence.onNext("?")

next(?)
next(?)
next(?)
Error: test
next(?)

let disposeBag = DisposeBag()
var count = 1
    
let retrySequence = Observable<String>.create { (observer) -> Disposable in
    observer.onNext("?")
    observer.onNext("?")
        
    if count == 1 {
        observer.onError(TestError.test)
        print("Error encountered")
        count += 1
    }
        
    observer.onNext("?")
    observer.onNext("?")
        
    return Disposables.create()
}
    
retrySequence.retry().subscribe(onNext: {print($0)}).disposed(by: disposeBag)

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Error encountered
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let disposeBag = DisposeBag()
var count = 1
    
let sequenceThatErrors = Observable<String>.create { observer in
    observer.onNext("?")
    observer.onNext("?")
    observer.onNext("?")
        
    if count < 5 {
        observer.onError(TestError.test)
        print("Error encountered")
        count += 1
    }
        
    observer.onNext("?")
    observer.onNext("?")
    observer.onCompleted()
        
    return Disposables.create()
}
    
sequenceThatErrors.retry(3).subscribe(onNext: { print($0) }).disposed(by: disposeBag)

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Error encountered
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Error encountered
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Error encountered
Received unhandled error: Playground.xcplaygroundpage:41:__lldb_expr_18 -> test