ViewController ⁶ Presenter by RxSwift iOS Test Night #3

ࣗݾ঺հ • Takeshi Ihara / @nonchalant0303 • Recruit Marketing Partners • iOS Engineer

RxSwift Rx is a generic abstraction of computation expressed through Observable interface. This is a Swift version of Rx.

ViewController ⁶ Presenter

ViewController • ը໘දࣔ΍ϢʔβͷλονΠϕϯτͳͲͷ EventΛPresenterʹ௨஌͢Δ • Presenter͔Βड͚औͬͨStateʹΑΓView ͷදࣔΛ੾Γସ͑Δ

Presenter • View͔ΒEventΛड͚औΓɺඞཁ͕͋Ε͹ EventʹԠͨ͡UseCaseΛ࣮ߦ͢Δ • UseCase͔Βड͚औͬͨσʔλΛStateͱ͠ ͯView΁౉͢

ViewController (VC) Presenter State Event

prepare VC viewWillAppear Presenter → Event State ← prepared "1*$BMM Refresh View touch touched %POPUIJOH Refresh View touchEvent

class Presenter { enum State { case initial case prepared(value: Int) case touched } enum Event { case prepare case touch } let eventReciever = PublishSubject() private let innerViewRefrector = BehaviorSubject(value: .initial) private let disposeBag = DisposeBag() var viewRefrector: Observable { return innerViewRefrector.asObservable() } init() { eventReciever .flatMap { event -> Observable in switch event { case .prepare: return [API Call] .map { .prepared(value: $0) } case .touch: return Observable.just(.touched) } } .bindTo(innerViewRefrector) .addDisposableTo(disposeBag) } }

class Presenter { enum State { // VCʹฦ͢ঢ়ଶ case initial case prepared(value: Int) case touched } enum Event { // VC͔Βड͚औΔΠϕϯτ case prepare case touch } 
 … }

class Presenter { … let eventReciever = PublishSubject() private let innerViewRefrector = BehaviorSubject(value: .initial) private let disposeBag = DisposeBag() var viewRefrector: Observable { return innerViewRefrector.asObservable() } … } ௨஌ɾड৴ܥͷαϒδΣΫτ

class Presenter { … init() { eventReciever .flatMap { event -> Observable in switch event { case .prepare: return [API Call] .map { .prepared(value: $0) } case .touch: return Observable.just(.touched) } } .bindTo(innerViewRefrector) .addDisposableTo(disposeBag) } }

class Presenter { enum State { case initial case prepared(value: Int) case touched } enum Event { case prepare case touch } let eventReciever = PublishSubject() private let innerViewRefrector = BehaviorSubject(value: .initial) private let disposeBag = DisposeBag() var viewRefrector: Observable { return innerViewRefrector.asObservable() } init() { eventReciever .flatMap { event -> Observable in switch event { case .prepare: return [API Call] .map { .prepared(value: $0) } case .touch: return Observable.just(.touched) } } .bindTo(innerViewRefrector) .addDisposableTo(disposeBag) } } VCʹฦ͢ঢ়ଶ VC͔Βड͚औΔΠϕϯτ ௨஌ɾड৴ܥͷαϒδΣΫτ ΠϕϯτΛड͚औͬͯ ঢ়ଶΛฦ͢

class ViewController: UIViewController { typealias Event = Presenter.Event var presenter: Presenter! private let disposeBag = DisposeBag() override func viewDidLoad() { setupUIBindings() setupEventBindings() } private func setupUIBindings() { presenter.viewRefrector .asDriver(onErrorDriveWith: .empty()) .drive( onNext: { state in switch state { case .initial: break case .prepared(let value): // API͔Βͷ݁ՌΛ༻͍ͯViewʹ൓ө͢Δ case .touched: // Touchͷ݁ՌΛViewʹ൓ө͢Δ } } ) .addDisposableTo(disposeBag) } private func setupEventBindings() { rx.sentMessage(#selector(UIViewController.viewWillAppear(_:))) .map { _ in () } .shareReplay(1) .map { return Event.prepare } .bindTo(presenter.eventReciever) .addDisposableTo(disposeBag) btn.rx.tap .map { return Event.touch } .bindTo(presenter.eventReciever) .addDisposableTo(disposeBag) } }

class ViewController: UIViewController { typealias Event = Presenter.Event var presenter: Presenter! private let disposeBag = DisposeBag() override func viewDidLoad() { setupUIBindings() setupEventBindings() } … }

class ViewController: UIViewController { … private func setupUIBindings() { presenter.viewRefrector .asDriver(onErrorDriveWith: .empty()) .drive( onNext: { state in switch state { case .initial: break case .prepared(let value): // API͔Βͷ݁ՌΛ༻͍ͯViewʹ൓ө͢Δ case .touched: // Touchͷ݁ՌΛViewʹ൓ө͢Δ } } ) .addDisposableTo(disposeBag) } … }

class ViewController: UIViewController { … private func setupEventBindings() { rx.sentMessage(#selector(UIViewController.viewWillAppear(_:))) // viewWillAppearΛPresenterʹྲྀͯ͠Δ .map { _ in () } .shareReplay(1) .map { return Event.prepare } .bindTo(presenter.eventReciever) .addDisposableTo(disposeBag) btn.rx.tap // ϘλϯͷλονΠϕϯτΛPresenterʹྲྀͯ͠Δ .map { return Event.touch } .bindTo(presenter.eventReciever) .addDisposableTo(disposeBag) } }

class ViewController: UIViewController { typealias Event = Presenter.Event var presenter: Presenter! private let disposeBag = DisposeBag() override func viewDidLoad() { setupUIBindings() setupEventBindings() } private func setupUIBindings() { presenter.viewRefrector .asDriver(onErrorDriveWith: .empty()) .drive( onNext: { state in switch state { case .initial: break case .prepared(let value): // API͔Βͷ݁ՌΛ༻͍ͯViewʹ൓ө͢Δ case .touched: // Touchͷ݁ՌΛViewʹ൓ө͢Δ } } ) .addDisposableTo(disposeBag) } private func setupEventBindings() { rx.sentMessage(#selector(UIViewController.viewWillAppear(_:))) .map { _ in () } .shareReplay(1) .map { return Event.prepare } .bindTo(presenter.eventReciever) .addDisposableTo(disposeBag) btn.rx.tap .map { return Event.touch } .bindTo(presenter.eventReciever) .addDisposableTo(disposeBag) } } StateΛड͚औͬͯ ViewΛ൓ө͢Δ EventΛૹΔ

prepare VC viewWillAppear Presenter → Event State ← prepared "1*$BMM Refresh View touch touched %POPUIJOH Refresh View touchEvent

ViewController (VC) Presenter State Event

Test

ViewController (VC) Presenter State Event

ViewController (VC) Presenter State Event Testର৅

Test Case • Input: VC͔Βड͚औΔEvent • Output: Presenter͕VCʹૹΔState

prepare VC viewWillAppear Presenter → Event State ← prepared "1*$BMM Refresh View touch touched %POPUIJOH Refresh View touchEvent

%POPUIJOH "1*$BMM VC viewWillAppear Presenter → Event State ← prepare prepared Refresh View touch touched Refresh View touchEvent Test Case Test Case

Test with Rx • Rx͸σʔλ͕࣍ݩͱ͍͏୯ҐΛ͍࣋ͬͯΔ ͷͰɺ࣌ࠁʹΑͬͯҧ͏ঢ়ଶΛ͍࣋ͬͯΔ • ࣌ࠁʹґଘ͢Δςετ͸؀ڥґଘ͕େ͖͘ ෆ҆ఆͳςετʹͳΓ΍͍͢

RxTest • RxSwiftͷςετ༻ϑϨʔϜϫʔΫ • ࣮࣌ؒͱ͸ҟͳΔԾ૝࣌ؒʹج͖ͮΠϕϯ τΛൃੜͤ͞Δ࢓૊Έ

// 5FTUBCMF0CTFSWBCMF1SFTFOUFS4UBUFΛੜ੒ let observer = scheduler.createObserver(Presenter.State.self) let xs = scheduler.createColdObservable([ // Ծ૝࣌ࠁ100ޙʹprepareΠϕϯτΛૹΔ next(100, Presenter.UserEvent.prepare) ]) // Ծ૝࣌ࠁ100ʹxsΛeventReceiverʹbinding͢Δ // ஗ԆධՁ͕૸Δ scheduler.scheduleAt(100) { xs .bindTo(presenter.eventReceiver) .addDisposableTo(disposeBag) } // WJFX3FGMFDUFSΛobserverʹSubscribeͤ͞Δ scheduler.scheduleAt(200) { presenter.viewReflecter .subscribe(observer) .addDisposableTo(disposeBag) }

Test Case

class PresenterSpec: QuickSpec { override func spec() { describe("Presenter") { var presenter: Presenter! var scheduler: TestScheduler! var disposeBag: DisposeBag! beforeEach { scheduler = TestScheduler(initialClock: 0) presenter = Presenter() disposeBag = DisposeBag() } context("when prepare") { it("prepared") { let observer = scheduler.createObserver(Presenter.State.self) let xs = scheduler.createColdObservable([ next(100, Presenter.UserEvent.prepare) ]) scheduler.scheduleAt(100) { xs .bindTo(presenter.eventReceiver) .addDisposableTo(disposeBag) } scheduler.scheduleAt(200) { presenter.viewReflecter .subscribe(observer) .addDisposableTo(disposeBag) } scheduler.start() expect(observer.events.count).to(equal(2)) expect(observer.events[0].time).to(equal(200)) expect(observer.events[1].time).to(equal(300)) let initial = observer.events[0].value.element expect(initial).toNot(beNil()) expect(initial!).to(equal(Presenter.State.initial)) let subject = observer.events[1].value.element expect(subject).toNot(beNil()) expect(subject!).to(equal(Presenter.State.prepared(value: 1))) } } } } }

class PresenterSpec: QuickSpec { override func spec() { describe("Presenter") { var presenter: Presenter! var scheduler: TestScheduler! var disposeBag: DisposeBag! beforeEach { scheduler = TestScheduler(initialClock: 0) presenter = Presenter() disposeBag = DisposeBag() } … } } }

class PresenterSpec: QuickSpec { override func spec() { describe("Presenter") { … context("when prepare") { it("prepared") { let observer = scheduler.createObserver(Presenter.State.self) let xs = scheduler.createColdObservable([ next(100, Presenter.UserEvent.prepare) ]) scheduler.scheduleAt(100) { xs .bindTo(presenter.eventReceiver) .addDisposableTo(disposeBag) } scheduler.scheduleAt(200) { presenter.viewReflecter .subscribe(observer) .addDisposableTo(disposeBag) } scheduler.start() … } } } } }

class PresenterSpec: QuickSpec { override func spec() { describe("Presenter") { … context("when prepare") { it("prepared") { … expect(observer.events.count).to(equal(2)) expect(observer.events[0].time).to(equal(200)) expect(observer.events[1].time).to(equal(200)) let initial = observer.events[0].value.element expect(initial).toNot(beNil()) expect(initial!).to(equal(Presenter.State.initial)) let subject = observer.events[1].value.element expect(subject).toNot(beNil()) expect(subject!).to(equal(Presenter.State.prepared(value: 1))) } } } } } ड͚ͱͬͨঢ়ଶͷ ൃੜͨ࣌͠ࠁɾछྨΛݕূ

class PresenterSpec: QuickSpec { override func spec() { describe("Presenter") { var presenter: Presenter! var scheduler: TestScheduler! var disposeBag: DisposeBag! beforeEach { scheduler = TestScheduler(initialClock: 0) presenter = Presenter() disposeBag = DisposeBag() } context("when prepare") { it("prepared") { let observer = scheduler.createObserver(Presenter.State.self) let xs = scheduler.createColdObservable([ next(100, Presenter.UserEvent.prepare) ]) scheduler.scheduleAt(100) { xs .bindTo(presenter.eventReceiver) .addDisposableTo(disposeBag) } scheduler.scheduleAt(200) { presenter.viewReflecter .subscribe(observer) .addDisposableTo(disposeBag) } scheduler.start() expect(observer.events.count).to(equal(2)) expect(observer.events[0].time).to(equal(200)) expect(observer.events[1].time).to(equal(200)) let initial = observer.events[0].value.element expect(initial).toNot(beNil()) expect(initial!).to(equal(Presenter.State.initial)) let subject = observer.events[1].value.element expect(subject).toNot(beNil()) expect(subject!).to(equal(Presenter.State.prepared(value: 1))) } } } } } ड͚ͱͬͨঢ়ଶͷ ൃੜͨ࣌͠ࠁɾछྨΛݕূ Ծ૝࣌ࠁ্Ͱͷ ΠϕϯτϋϯυϦϯάΛઃఆ

ViewController (VC) Presenter State Event

·ͱΊ • ViewͷඳըͳͲʹґଘ͠ͳ͍γϯϓϧͳ
 ΠϕϯτϕʔεͷςετΛॻ͚ͨ • ·ͨɺෳ਺ͷΠϕϯτΛϋϯυϦϯά͢Δ ͜ͱͰෳࡶͳςετΛλΠϛϯάʹґଘ͞ ͤΔ͜ͱͳ͘ॻ͘͜ͱ͕ग़དྷΔ