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RxSwift 5min
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USAMI Kosuke
January 27, 2016
Programming
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100
RxSwift 5min
http://kanmoba.connpass.com/event/25185/
USAMI Kosuke
January 27, 2016
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Transcript
RxSwift USAMI Kosuke (Fenrir Inc.)
RxSwift ReactiveX for Swift → ReactiveX family : Rx.NET /
RxJS / RxJava / ...
RxSwift Released! 2.0.0 : 2016/01/02 (Latest release = 2.1.0 :
2016/01/11)
5ͰΘ͔Δ RxSwift
ͱΓ͋͑ͣ ͬͯΈΔͨΊ ͷࣝ
ͱΓ͋͑ͣͬͯΈΔͨΊͷࣝ → Observable → Subscribe → Error Handling
Observable
Observable → ඇಉظσʔλετϦʔϜ → UI ͔ΒͷΞΫγϣϯ → OS ͔Βͷ Notification
→ URL ηογϣϯͷϨεϙϯε
Observable ͷཁૉ → Next → Completed → Error
Next → case .Next(let value) → value = ετϦʔϜͷσʔλ
Completed → case .Completed → ετϦʔϜͷऴΘΓ → ໌ࣔతͳऴΘΓ͕ͳ͍ετϦʔϜ͋Δ
Error → case .Error(let error) → error = ErrorType ܕͷ
→ ετϦʔϜͷऴΘΓͰ͋Δ
Observable ͷੜ → Observable.create ͳͲͰੜ → RxCocoa ͕༻ҙ͍ͯ͠Δ rx_tap /
rx_notification / rx_response / ...
Subscribe
Subscribe → ετϦʔϜ͔ΒσʔλΛड͚औΔ → subscribeNext → subscribeCompleted → subscribeError
ྫ : UIButton ΞΫγϣϯ hogeButton.rx_tap .subscribeNext { [unowned self] _
in self.hoge() }
ྫ : NSNotification let center = NSNotificationCenter.defaultCenter() center.rx_notification(UIApplicationDidBecomeActiveNotification) .subscribeNext {
[unowned self] _ in self.hoge() }
ྫ : NSURLSession let session: NSURLSession = ... let request
= NSURLRequest(...) session.rx_response(request) .subscribeNext { (data, response) in ... }
Error Handling
catchError hogeObservable .catchError { error in ... } .subscribeNext {
... }
retry hogeObservable .retry(3) // 3ճ·ͰϦτϥΠ .subscribeNext { ... }
retryWhen hogeObservable .retryWhen { _ in // 30ඵޙʹϦτϥΠ return Observable.timer(30,
...) } .subscribeNext { ... }
͏ͪΐͬͱ Rx Β͘͠
͏ͪΐͬͱ Rx Β͘͠ → Transforming / Filtering → Combining →
Subject
Transforming / Filtering
Transforming / Filtering → Observable ʹରͯ͠ map / flatMap /
filter ͳͲ → Array ʹର͢Δ map / flatMap / filter ͱಉ༷
map hogeObservable .map { $0 * 10 }
flatMap
filter
Chaining Operators hogeObservable .filter { ... } .map { ...
} .subscribeNext { ... }
Combining
Combining → ෳͷετϦʔϜΛͻͱͭͷετϦʔϜʹ·ͱΊ Δ
merge
combineLatest
Subject
Subject → Observable ͷҰछ → ֎෦͔Β Subject ʹσʔλΛྲྀͤΔ → Hot
Observable
σʔλΛྲྀ͢ let subject = PublishSubject<String>() subject.on(.Next("a")) subject.on(.Next("b")) subject.on(.Completed) ////////// subject.subscribeNext
{ ... }
ετϦʔϜͷذ → ͻͱͭͷετϦʔϜ͔Βෳͷ Subscriber ʹ → ʢHot Observableʣ
͓͞Β͍
͓͞Β͍ → Observable → Subscribe → Error Handling → Transforming
/ Filtering → Combining → Subject
Have a Happy RxSwift Life!