ReactorKit Testability

Mobile Act OSAKA #8
https://mobileact.connpass.com/event/114158/

ブログ記事
https://usami-k.hatenablog.com/entry/2019/02/16/191850

1. ReactorKit Ͱςετ ͠΍͘͢͢Δ USAMI Kosuke Fenrir Inc.
2. ࣗݾ঺հ • Ӊࠤݟެี @usamik26 • ϑΣϯϦϧגࣜձࣾ • iOS ΞϓϦ։ൃ Swift / C# (Xamarin)
3. தࠃʹߦ͖ͬͯͨ • ੒౎ ඈ࿛Պٕ • iOS ΞϓϦ։ൃϝϯόͱٕज़ަྲྀ • ੒౎ϝϯόʔ͸ ReactorKit Λ࢖ͬ ͍ͯͨ
4. ReactorKit ͱ͸ • RxSwift • Fluxʢ୯ํ޲ϑϩʔʣ • ܰྔͳϑϨʔϜϫʔΫ
5. Design Goal • Testability : View ͱϩδοΫͷ෼཭ • Start Small : ΞϓϦͷҰ෦͚ͩͰ΋ద༻Ͱ͖Δ • Less Typing : ίʔυΛෳࡶʹ͠ͳ͍
6. Testability • ςετՄೳੑɺςετ༰қੑ • ࠓճ͸ Testability ʹ஫໨ͯ͠ ReactorKit ΛݟͯΈΔ
7. ߏ੒ਤ
8. View ͱ Reactor • View ͷ੹຿ (1) • UI ૢ࡞ → Action ͱͯ͠ Reactor ʹ౉͢ • Reactor ͷ੹຿ • Action → ॲཧΛߦ͍ State Λੜ੒͢Δ • View ͷ੹຿ (2) • State → UI ʹදࣔ͢Δ
9. ੹຿ͷ෼཭ • UIViewController ʹ͸ View ͷ੹຿͚ͩΛ࣋ͨͤΔ • Reactor ͸ผΦϒδΣΫτͱͯ͠෼཭ʢͳ͓ɺReactor ͸ UIKit ͸࢖Θͳ͍ʣ • ͜ΕʹΑΓ Testability ͕޲্͢Δ • ࠓճ͸ಛʹ View ͷ Testability ΛݟͯΈΔ
10. View ϓϩτίϧ class MyViewController: View { func bind(reactor: MyReactor) { // ͜͜Ͱ Reactor ͱͷόΠϯσΟϯάΛߦ͏ // RxSwift Λ׆༻ } }
11. Reactor ϓϩτίϧ class MyReactor: Reactor { enum Action { case myAction case myActionWithArg(Int) } struct State { var myValue1 = "" var myValue2 = false } }
12. View ͷόΠϯσΟϯά : Action func bind(reactor: MyReactor) { myButton.rx.tap .map { Reactor.Action.myAction } .bind(to: reactor.action) .disposed(by: self.disposeBag) ʢͳ͓ɺreactor.action ͸ ActionSubjectʣ
13. View ͷόΠϯσΟϯά : State func bind(reactor: MyReactor) { reactor.state .map { $0.myValue1 } .bind(to: myLabel.rx.text) .disposed(by: self.disposeBag) ʢͳ͓ɺreactor.state ͸ Observableʣ
14. Reactor ͷॲཧ : mutate() • Action Λड͚औͬͯ Observable<Mutation> Λฦ͢ • ۩ମతͳॲཧʢWeb API ࣮ߦɺσʔλϕʔεΞΫηεɺͳͲʣ Λߦ͏ Observable Λੜ੒͢Δ • ࣮ࡍʹॲཧΛߦ͏͔Ͳ͏͔ͷ൑அͳͲ͸ Reactor ͷ໾໨ • ͜ΕʹΑΓɺView ଆͰ͸ Action Λੜ੒͢Δ͔Ͳ͏͔Λ൑ அ͠ͳ͍ͨΊɺView ͷ࣮૷͕όΠϯσΟϯά͚ͩͰ͢Ή
15. Reactor ͷॲཧ : reduce() • Mutation ͱલͷ State Λड͚औͬͯ State Λฦ͢ • ॲཧͷ݁Ռͱલͷঢ়ଶΛߟྀͯ࣍͠ͷঢ়ଶΛܾΊΔͷ͕໾໨ • ͜ΕʹΑΓɺView ଆͰ͸લͷঢ়ଶΛߟྀ͢Δͱ͍ͬͨॲཧ͕ ෆཁʹͳΔͨΊɺView ͷ࣮૷͕όΠϯσΟϯά͚ͩͰ͢Ή
16. View ͷ୯ମςετΛߟ͑Δ • ୯ମςετͰԿΛ͢Δ΂͖͔ʁ • ʮͦͷΦϒδΣΫτͷ੹຿ΛՌ͍ͨͯ͠Δ͔ʯΛςετ͢Δ • View ͷ੹຿ (1) : UI ૢ࡞ → Action • View ͷ੹຿ (2) : State → UI දࣔ
17. View ͷςετ : Action • ίʔυͰ UI ૢ࡞Λൃੜͤ͞Δ • myButton.sendActions(for .touchUpInside) • ͦͷ݁Ռͱͯ͠ɺReactor ʹ Action ΦϒδΣΫτ͕౉͞Ε ͨ͜ͱΛ֬ೝ͍ͨ͠ • Ͳ͏΍ͬͯʁ ʹ Reactor ͷελϒΛ༻ҙ͢Ε͹͍͍ • ࣮͸ ReactorKit Ͱ͸ελϒ͕͢Ͱʹ༻ҙ͞Ε͍ͯΔ
18. View ͷςετ : Action func testMyAction() { let reactor = MyReactor() reactor.stub.isEnabled = true let view = MyView() view.reactor = reactor view.myButton.sendActions(for .touchUpInside) XCTAssertEqual(reactor.stub.actions.last, .myAction) }
19. View ͷςετ : State • ΍͸Γ Reactor ͷελϒΛ׆༻͢Δ • ίʔυͰ Reactor ͷ State มԽΛى͜͢ • ͦͷ݁Ռͱͯ͠ɺUI ද͕ࣔมߋ͞Εͨ͜ͱΛ֬ೝ͢Δ
20. View ͷςετ : State func testMyAction() { let reactor = MyReactor() reactor.stub.isEnabled = true let view = MyView() view.reactor = reactor reactor.stub.state.value = MyReactor.State(myValue1: "abc") XCTAssertEqual(view.myLabel.text, "abc") }
21. View ͷςετ·ͱΊ • Կ͕ςετͰ͖ͨͷ͔ʁ : View ͕੹຿ΛՌ͍ͨͯ͠Δ͜ͱ • View ͷ࣮૷ͱͯ͠͸όΠϯσΟϯά͕ͪΌΜͱͰ͖͍ͯΔ͜ ͱ • ͦ΋ͦ΋ςετඞཁʁ : Testability ޲্ͷͨΊγϯϓϧ ͳΦϒδΣΫτʹͳͬͨ݁Ռɺ୯७͗ͯ͢ςετෆཁͰ͸ͱ͍ ͏Ϩϕϧʹ • ࣮ࡍʹςετίʔυΛॻ͔͘Ͳ͏͔͸έʔεόΠέʔε
22. Reactor ͷ୯ମςετʢུ֓ʣ • ʮͦͷΦϒδΣΫτͷ੹຿ΛՌ͍ͨͯ͠Δ͔ʯΛςετ͢Δ • Reactor ͷ੹຿ : Action → State • ίʔυͰ Action Λൃੜͤͯ͞ɺState มߋΛ֬ೝ͢Δ • Reactor ͸ View ΁ͷґଘ͕ͳ͍ͨΊɺಠཱͯ͠ςετՄೳ
23. Reactor ͷ୯ମςετʢུ֓ʣ • Reactor ͷதͰ Web API ࣮ߦɺσʔλϕʔεΞΫηεɺͳ Ͳ͕͋Δͱ୯ମςετ͠ʹ͘͘ͳΔ • ͦ͜ͰɺͦΕΒΛ Service ͱͯ͠ Reactor ͷ֎ʹ੾Γग़͢ • Service ΛελϒԽ͢Δ͜ͱͰ Reactor ͕୯ମςετՄೳ
24. ·ͱΊ • ෳ਺ͷ੹຿Λ͕࣋ͪͪͳ UIViewController ʹ͍ͭͯɺ ReactorKit Ͱ View ͱ Reactor ʹ੹຿Λ෼཭ͨ͠ • ͜ΕʹΑΓɺView ΍ Reactor ͕ςετՄೳʹͳͬͨ