104 lines
2.6 KiB
Swift
104 lines
2.6 KiB
Swift
/*:
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> # IMPORTANT: To use `Rx.playground`, please:
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1. Open `Rx.xcworkspace`
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2. Build `RxSwift-OSX` scheme
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3. And then open `Rx` playground in `Rx.xcworkspace` tree view.
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4. Choose `View > Show Debug Area`
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*/
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//: [<< Previous](@previous) - [Index](Index)
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import RxSwift
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import Foundation
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/*:
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## Error Handling Operators
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Operators that help to recover from error notifications from an Observable.
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*/
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/*:
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### `catchError`
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Recover from an `Error` notification by continuing the sequence without error
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[More info in reactive.io website]( http://reactivex.io/documentation/operators/catch.html )
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*/
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example("catchError 1") {
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let sequenceThatFails = PublishSubject<Int>()
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let recoverySequence = Observable.of(100, 200, 300, 400)
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_ = sequenceThatFails
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.catchError { error in
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return recoverySequence
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}
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.subscribe {
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print($0)
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}
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sequenceThatFails.on(.Next(1))
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sequenceThatFails.on(.Next(2))
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sequenceThatFails.on(.Next(3))
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sequenceThatFails.on(.Next(4))
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sequenceThatFails.on(.Error(NSError(domain: "Test", code: 0, userInfo: nil)))
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}
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example("catchError 2") {
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let sequenceThatFails = PublishSubject<Int>()
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_ = sequenceThatFails
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.catchErrorJustReturn(100)
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.subscribe {
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print($0)
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}
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sequenceThatFails.on(.Next(1))
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sequenceThatFails.on(.Next(2))
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sequenceThatFails.on(.Next(3))
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sequenceThatFails.on(.Next(4))
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sequenceThatFails.on(.Error(NSError(domain: "Test", code: 0, userInfo: nil)))
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}
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/*:
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### `retry`
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If a source Observable emits an error, resubscribe to it in the hopes that it will complete without error
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[More info in reactive.io website]( http://reactivex.io/documentation/operators/retry.html )
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*/
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example("retry") {
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var count = 1 // bad practice, only for example purposes
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let funnyLookingSequence = Observable<Int>.create { observer in
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let error = NSError(domain: "Test", code: 0, userInfo: nil)
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observer.on(.Next(0))
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observer.on(.Next(1))
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observer.on(.Next(2))
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if count < 2 {
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observer.on(.Error(error))
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count += 1
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}
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observer.on(.Next(3))
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observer.on(.Next(4))
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observer.on(.Next(5))
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observer.on(.Completed)
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return NopDisposable.instance
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}
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_ = funnyLookingSequence
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.retry()
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.subscribe {
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print($0)
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}
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}
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//: [Index](Index) - [Next >>](@next)
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