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RxSwift USAMI Kosuke (Fenrir Inc.)
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RxSwift ReactiveX for Swift → ReactiveX family : Rx.NET / RxJS / RxJava / ...
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RxSwift Released! 2.0.0 : 2016/01/02 (Latest release = 2.1.0 : 2016/01/11)
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5ͰΘ͔Δ RxSwift
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ͱΓ͋͑ͣ ͬͯΈΔͨΊ ͷࣝ
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ͱΓ͋͑ͣͬͯΈΔͨΊͷࣝ → Observable → Subscribe → Error Handling
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Observable
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Observable → ඇಉظσʔλετϦʔϜ → UI ͔ΒͷΞΫγϣϯ → OS ͔Βͷ Notification → URL ηογϣϯͷϨεϙϯε
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Observable ͷཁૉ → Next → Completed → Error
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Next → case .Next(let value) → value = ετϦʔϜͷσʔλ
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Completed → case .Completed → ετϦʔϜͷऴΘΓ → ໌ࣔతͳऴΘΓ͕ͳ͍ετϦʔϜ͋Δ
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Error → case .Error(let error) → error = ErrorType ܕͷ → ετϦʔϜͷऴΘΓͰ͋Δ
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Observable ͷੜ → Observable.create ͳͲͰੜ → RxCocoa ͕༻ҙ͍ͯ͠Δ rx_tap / rx_notification / rx_response / ...
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Subscribe
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Subscribe → ετϦʔϜ͔ΒσʔλΛड͚औΔ → subscribeNext → subscribeCompleted → subscribeError
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ྫ : UIButton ΞΫγϣϯ hogeButton.rx_tap .subscribeNext { [unowned self] _ in self.hoge() }
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ྫ : NSNotification let center = NSNotificationCenter.defaultCenter() center.rx_notification(UIApplicationDidBecomeActiveNotification) .subscribeNext { [unowned self] _ in self.hoge() }
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ྫ : NSURLSession let session: NSURLSession = ... let request = NSURLRequest(...) session.rx_response(request) .subscribeNext { (data, response) in ... }
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Error Handling
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catchError hogeObservable .catchError { error in ... } .subscribeNext { ... }
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retry hogeObservable .retry(3) // 3ճ·ͰϦτϥΠ .subscribeNext { ... }
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retryWhen hogeObservable .retryWhen { _ in // 30ඵޙʹϦτϥΠ return Observable.timer(30, ...) } .subscribeNext { ... }
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͏ͪΐͬͱ Rx Β͘͠
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͏ͪΐͬͱ Rx Β͘͠ → Transforming / Filtering → Combining → Subject
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Transforming / Filtering
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Transforming / Filtering → Observable ʹରͯ͠ map / flatMap / filter ͳͲ → Array ʹର͢Δ map / flatMap / filter ͱಉ༷
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map hogeObservable .map { $0 * 10 }
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flatMap
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filter
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Chaining Operators hogeObservable .filter { ... } .map { ... } .subscribeNext { ... }
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Combining
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Combining → ෳͷετϦʔϜΛͻͱͭͷετϦʔϜʹ·ͱΊ Δ
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merge
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combineLatest
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Subject
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Subject → Observable ͷҰछ → ֎෦͔Β Subject ʹσʔλΛྲྀͤΔ → Hot Observable
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σʔλΛྲྀ͢ let subject = PublishSubject() subject.on(.Next("a")) subject.on(.Next("b")) subject.on(.Completed) ////////// subject.subscribeNext { ... }
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ετϦʔϜͷذ → ͻͱͭͷετϦʔϜ͔Βෳͷ Subscriber ʹ → ʢHot Observableʣ
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͓͞Β͍
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͓͞Β͍ → Observable → Subscribe → Error Handling → Transforming / Filtering → Combining → Subject
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Have a Happy RxSwift Life!