RxSwift Observable.create

http://kanmoba.connpass.com/event/42374/

Transcript

1. RxSwift Observable ͷ࡞Γํ USAMI Kosuke (Fenrir Inc.)
2. RxSwift 3 released » For Swift 3 » ಛʹɺ໋໊ϧʔϧ͕େ෯ʹมΘ͍ͬͯΔ » Swift 2 ܥͰ͸ RxSwift 2 ܥΛ࢖͏
3. RxSwift ͓͞Β͍
4. Observable ͱ͸ » ҎԼͷ3छྨͷ΋ͷ͕ྲྀΕͯ͘ΔඇಉظετϦʔϜ » .next(Element) » .error(Error)ʢετϦʔϜऴྃʣ » .completedʢετϦʔϜऴྃʣ
5. Observable Λ࢖͏ : جຊܗ hogeObservable .subscribe(onNext: { element in print(element) }) .addDisposableTo(disposeBag)
6. Observable Λ࢖͏ : Operator hogeObservable .catchError { ... } .filter { ... } .map { ... } ...
7. ΑΓৄ͘͠͸ҎԼ͕Φεεϝ » Rx.playground » RxExample.xcodeproj » RxSwift ϦϙδτϦʹ͋Δ
8. ༻ҙ͞Ε͍ͯΔ Observable » UI ύʔπͷ Observable ͸͍͍ͩͨ༻ҙ͞Ε͍ͯΔ » UIButton.rx.tap » UITextField.rx.text » UILabel.rx.text
9. ୯७ʹΠϕϯτΛྲྀ͢ Observable let variable = Variable("1") variable.value = "2" variable.value = "3" let subject = PublishSubject<String>() subject.onNext("A") subject.onNext("B")
10. ͦΕҎ֎ͷ Observable ͸ʁ » ඞཁʹԠͯࣗ͡෼Ͱ༻ҙ͢Δ
11. Observable Λ࡞Δ
12. Observable.create() let hoge = Observable.create { observer in observer.on(.next("hoge")) observer.on(.completed) return Disposables.create() }
13. ϙΠϯτ (1) ΤϥʔΛૹΖ͏ » Observable ͷྑ͞Λੜ͔͢ » ੒ޭ࣌ʹ͸݁Ռ͚ͩʢnextʣɺࣦഊ࣌ʹ͸Τϥʔ͚ͩʢerrorʣ » ݁ՌͱΤϥʔ͕྆ํฦΔ͜ͱ͸ͳ͍ͱ͍͏อূ » ΤϥʔΛࣺͯΔͷ͸ Observer ଆͷ࢓ࣄ
14. ϙΠϯτ (1) ΤϥʔΛૹΖ͏ let hoge = Observable.create { [unowned self] observer in do { let result = try self.hogehoge() observer.on(.next(result)) observer.on(.completed) } catch let error { observer.on(.error(error)) } return Disposables.create() }
15. ϙΠϯτ (2) ΩϟϯηϧՄೳʹ͠Α͏ » Observable ͷ؂ࢹʢsubscribeʣΛ΍ΊΔʢdisposeʣ৔߹ͷରॲ » dispose ͞Εͨ࣌ͷΩϟϯηϧॲཧ͸ Observable ଆͷ࢓ࣄ
16. ϙΠϯτ (2) ΩϟϯηϧՄೳʹ͠Α͏ let hoge = Observable.create { [unowned self] observer in let task = self.dataTaskWithRequest(request) { ... } task.resume() return Disposables.create { task.cancel() // dispose ࣌ʹ͕࣮͜͜ߦ͞ΕΔ } }
17. Ԡ༻ : ΩϟϯηϧϙΠϯτΛ࡞Δ let hoge = Observable.create { [unowned self] observer in self.scheduler.schedule(()) { _ in hogeTask1() // ͜͜ͰΩϟϯηϧͰ͖ΔΑ͏ʹ͍ͨ͠ hogeTask2() } return Disposables.create { ??? } }
18. Ԡ༻ : ΩϟϯηϧϙΠϯτΛ࡞Δ let hoge = Observable.create { [unowned self] observer in let cancelDisposable = BooleanDisposable() let disposable = self.scheduler.schedule(()) { _ in hogeTask1() if cancelDisposable.disposed == true { return } hogeTask2() } return CompositeDisposable(disposable, cancelDisposable) }
19. Observable Λ࡞Δʹ͸ » Ҏ্ͷ͜ͱΛԡ͓͚͑ͯ͞͹͍͍Μ͡Όͳ͍Ͱ͠ΐ͏͔
20. Observable Λ࡞Δͱ͸ » Non Rx ͳੈքΛ Rx ͳੈքʹ͢Δ » Observable ͕࡞ΕΔͱɺͳΜͰ΋ Rx ʹͰ͖Δ