RxSwift 5min

http://kanmoba.connpass.com/event/25185/

Transcript

1. RxSwift USAMI Kosuke (Fenrir Inc.)
2. RxSwift ReactiveX for Swift → ReactiveX family : Rx.NET / RxJS / RxJava / ...
3. RxSwift Released! 2.0.0 : 2016/01/02 (Latest release = 2.1.0 : 2016/01/11)
4. 5෼ͰΘ͔Δ RxSwift
5. ͱΓ͋͑ͣ࢖ ͬͯΈΔͨΊ ͷ஌ࣝ
6. ͱΓ͋͑ͣ࢖ͬͯΈΔͨΊͷ஌ࣝ → Observable → Subscribe → Error Handling
7. Observable
8. Observable → ඇಉظσʔλετϦʔϜ → UI ͔ΒͷΞΫγϣϯ → OS ͔Βͷ Notification → URL ηογϣϯͷϨεϙϯε
9. Observable ͷཁૉ → Next → Completed → Error
10. Next → case .Next(let value) → value = ετϦʔϜ಺ͷσʔλ
11. Completed → case .Completed → ετϦʔϜͷऴΘΓ → ໌ࣔతͳऴΘΓ͕ͳ͍ετϦʔϜ΋͋Δ
12. Error → case .Error(let error) → error = ErrorType ܕͷ஋ → ετϦʔϜͷऴΘΓͰ΋͋Δ
13. Observable ͷੜ੒ → Observable.create ͳͲͰੜ੒ → RxCocoa ͕༻ҙ͍ͯ͠Δ rx_tap / rx_notification / rx_response / ...
14. Subscribe
15. Subscribe → ετϦʔϜ͔ΒσʔλΛड͚औΔ → subscribeNext → subscribeCompleted → subscribeError
16. ྫ : UIButton ΞΫγϣϯ hogeButton.rx_tap .subscribeNext { [unowned self] _ in self.hoge() }
17. ྫ : NSNotification let center = NSNotificationCenter.defaultCenter() center.rx_notification(UIApplicationDidBecomeActiveNotification) .subscribeNext { [unowned self] _ in self.hoge() }
18. ྫ : NSURLSession let session: NSURLSession = ... let request = NSURLRequest(...) session.rx_response(request) .subscribeNext { (data, response) in ... }
19. Error Handling
20. catchError hogeObservable .catchError { error in ... } .subscribeNext { ... }
21. retry hogeObservable .retry(3) // 3ճ·ͰϦτϥΠ .subscribeNext { ... }
22. retryWhen hogeObservable .retryWhen { _ in // 30ඵޙʹϦτϥΠ return Observable.timer(30, ...) } .subscribeNext { ... }
23. ΋͏ͪΐͬͱ Rx Β͘͠
24. ΋͏ͪΐͬͱ Rx Β͘͠ → Transforming / Filtering → Combining → Subject
25. Transforming / Filtering
26. Transforming / Filtering → Observable ʹରͯ͠ map / flatMap / filter ͳͲ → Array ʹର͢Δ map / flatMap / filter ͱಉ༷
27. map hogeObservable .map { $0 * 10 }
28. flatMap
29. filter
30. Chaining Operators hogeObservable .filter { ... } .map { ... } .subscribeNext { ... }
31. Combining
32. Combining → ෳ਺ͷετϦʔϜΛͻͱͭͷετϦʔϜʹ·ͱΊ Δ
33. merge
34. combineLatest
35. Subject
36. Subject → Observable ͷҰछ → ֎෦͔Β Subject ʹσʔλΛྲྀͤΔ → Hot Observable
37. σʔλΛྲྀ͢ let subject = PublishSubject<String>() subject.on(.Next("a")) subject.on(.Next("b")) subject.on(.Completed) ////////// subject.subscribeNext { ... }
38. ετϦʔϜͷ෼ذ → ͻͱͭͷετϦʔϜ͔Βෳ਺ͷ Subscriber ʹ → ʢHot Observableʣ
39. ͓͞Β͍
40. ͓͞Β͍ → Observable → Subscribe → Error Handling → Transforming / Filtering → Combining → Subject
41. Have a Happy RxSwift Life!