Hello, ReactorKit 👋 - Speaker Deck

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Hello, ReactorKit! Suyeol Jeon https://github.com/devxoul

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Jeon Suyeol StyleShare Inc. Open Source Lover Then URLNavigator RxSwift ObjectMapper

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Why?

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Why? Massive View Controller

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Why? Massive View Controller RxSwift State Managing

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Massive View Controller https://developer.apple.com/library/archive/documentation/General/Conceptual/DevPedia-CocoaCore/MVC.html

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Massive View Controller https://developer.apple.com/library/archive/documentation/General/Conceptual/DevPedia-CocoaCore/MVC.html

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Massive View Controller https://developer.apple.com/library/archive/documentation/General/Conceptual/DevPedia-CocoaCore/MVC.html

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RxSwift State Managing Cyclic Data Dependencies

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RxSwift State Managing currentValue increaseValue()

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RxSwift State Managing currentValue increaseValue() last state

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RxSwift State Managing currentValue increaseValue() last state result

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RxSwift State Managing Cyclic Data Dependencies

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RxSwift State Managing Cyclic Data Dependencies Pagination List operation Value update ...

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RxSwift State Managing After a while...

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RxSwift State Managing After a while... Variable PublishSubject PublishRelay<[Item]> Variable BehaviorSubject Variable

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I wanted to... 1. Avoid Massive View Controller

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I wanted to... 1. Avoid Massive View Controller 2. Take advantages of RxSwift

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I wanted to... 1. Avoid Massive View Controller 2. Take advantages of RxSwift 3. Manage states gracefully

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ReactorKit

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ReactorKit can... 1. Avoid Massive View Controller ✅

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ReactorKit can... 1. Avoid Massive View Controller ✅ Separates responsibilities of view and logic

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ReactorKit can... 1. Avoid Massive View Controller ✅ Separates responsibilities of view and logic View Controller becomes simple

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ReactorKit can... 2. Take advantages of RxSwift ✅

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ReactorKit can... 2. Take advantages of RxSwift ✅ Based on RxSwift

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ReactorKit can... 2. Take advantages of RxSwift ✅ Based on RxSwift All of RxSwift features are available

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ReactorKit can... 3. Manage states gracefully ✅

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ReactorKit can... 3. Manage states gracefully ✅ Unidirectional data flow

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ReactorKit can... 3. Manage states gracefully ✅ Unidirectional data flow Modify states only in reduce()

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ReactorKit can... 3. Manage states gracefully ✅ Unidirectional data flow Modify states only in reduce() State management became easy

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ReactorKit can... Be the future ~1.1K ⭐ ~50K downloads ~900 apps https://starcharts.herokuapp.com/ReactorKit/ReactorKit

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ReactorKit can... Be the future ~1.1K ⭐ ~50K downloads ~900 apps https://starcharts.herokuapp.com/ReactorKit/ReactorKit

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Basic Concept

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Basic Concept Abstraction of User Interaction Abstraction of View State

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Basic Concept Renders view states Handles user interactions ViewController, Cell, ...

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Basic Concept protocol View { associatedtype Reactor var disposeBag: DisposeBag // gets called when // self.reactor is changed func bind(reactor: Reactor) }

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Basic Concept protocol StoryboardView { associatedtype Reactor var disposeBag: DisposeBag // gets called when // the view is loaded func bind(reactor: Reactor) } // for Storyboard support

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Basic Concept Performs business logic Manages states Corresponds to view

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Basic Concept protocol Reactor { associatedtype Action associatedtype Mutation associatedtype State var initialState: State }

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Basic Concept Based on RxSwift

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Data Flow

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Data Flow

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Data Flow Action → State ❌

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Data Flow Action → Mutation → State

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Data Flow Action → Mutation → State State manipulator

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Data Flow State manipulator Async-able Action → Mutation → State

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Data Flow State manipulator Async-able Not exposed to view Action → Mutation → State

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Data Flow (Action) -> Observable (State, Mutation) -> State

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Data Flow

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Data Flow class ProfileViewReactor: Reactor { enum Action { } struct State { } }

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Data Flow class ProfileViewReactor: Reactor { enum Action { case follow // user interaction } struct State { } }

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Data Flow class ProfileViewReactor: Reactor { enum Action { case follow // user interaction } struct State { var isFollowing: Bool // view state } }

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Data Flow class ProfileViewReactor: Reactor { enum Action { case follow // user interaction } struct State { var isFollowing: Bool // view state } } Execute user follow API → Change state

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Data Flow class ProfileViewReactor: Reactor { enum Action { case follow // user interaction } struct State { var isFollowing: Bool // view state } } Execute user follow API → Change state Async

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Data Flow class ProfileViewReactor: Reactor { enum Action { case follow // user interaction } enum Mutation { } struct State { var isFollowing: Bool // view state } }

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Data Flow class ProfileViewReactor: Reactor { enum Action { case follow // user interaction } enum Mutation { case setFollowing(Bool) // change state } struct State { var isFollowing: Bool // view state } }

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Data Flow

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Data Flow Tap follow button

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Data Flow Action.follow

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Data Flow Action.follow

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Data Flow UserService.follow()

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Data Flow UserService

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Data Flow Observable

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Data Flow

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Data Flow Mutation.setFollowing(true)

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Data Flow Mutation.setFollowing(true)

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Data Flow isFollowing = true

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Data Flow Update follow button

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Data Flow

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More Examples

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More Examples

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Advanced View Communications Testing View and Reactor

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View Communications ProfileViewController ProfileViewReactor

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View Communications UICollectionView ProfileViewController ProfileViewReactor

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View Communications UICollectionView ProfileViewController ProfileViewReactor UserCell

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View Communications Passing user data Observing button tap

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View Communications - Passing user data ProfileView Controller UserCell ProfileView Reactor

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View Communications - Passing user data ProfileView Controller UserCell ProfileView Reactor 1. User

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View Communications - Passing user data ProfileView Controller UserCell ProfileView Reactor 1. User 2. User

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View Communications - Passing user data // ProfileViewReactor struct State { }

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View Communications - Passing user data // ProfileViewReactor struct State { var user: User? }

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View Communications - Passing user data // ProfileViewReactor struct State { var user: User? } // ProfileViewController let cell = collectionView.dequeue... return cell

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View Communications - Passing user data // ProfileViewReactor struct State { var user: User? } // ProfileViewController let cell = collectionView.dequeue... if let reactor = self.reactor { } return cell

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View Communications - Observing button tap ProfileView Controller UserCell ProfileView Reactor

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View Communications - Observing button tap ProfileView Controller UserCell ProfileView Reactor 1. rx.tap

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View Communications - Observing button tap ProfileView Controller UserCell ProfileView Reactor 2. Action.follow 1. rx.tap

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View Communications - Observing button tap ProfileView Controller UserCell ProfileView Reactor 2. Action.follow 1. rx.tap Reactive Extension

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View Communications - Observing button tap // UserCell extension Reactive where Base: UserCell { }

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View Communications - Observing button tap // UserCell extension Reactive where Base: UserCell { var buttonTap: ControlEvent { } }

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View Communications - Observing button tap // UserCell extension Reactive where Base: UserCell { var buttonTap: ControlEvent { return self.base.followButton.rx.tap } }

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View Communications - Observing button tap // UserCell extension Reactive where Base: UserCell { var buttonTap: ControlEvent { return self.base.followButton.rx.tap } } // ProfileViewController cell.user = reactor.currentState.user

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View Communications - Observing button tap // UserCell extension Reactive where Base: UserCell { var tap: ControlEvent { return self.base.followButton.rx.tap } } // ProfileViewController cell.user = reactor.currentState.user cell.rx.buttonTap .map { Reactor.Action.follow }

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View Communications UICollectionView ProfileViewController ProfileViewReactor UserCell

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View Communications UICollectionView ProfileViewController ProfileViewReactor UserCell UserCellReactor

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View Communications - Passing user data ProfileView Controller UserCell ProfileView Reactor

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View Communications - Passing user data ProfileView Controller UserCell ProfileView Reactor UserCell Reactor

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View Communications - Passing user data ProfileView Controller UserCell ProfileView Reactor 1. CellReactor UserCell Reactor

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View Communications - Passing user data ProfileView Controller UserCell ProfileView Reactor 1. CellReactor 2. CellReactor UserCell Reactor

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View Communications - Passing user data ProfileView Controller UserCell ProfileView Reactor 1. CellReactor 2. CellReactor UserCell Reactor

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View Communications - Passing user data // ProfileViewReactor struct State { var user: User? }

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View Communications - Passing user data // ProfileViewReactor struct State { var user: User? var userCellReactor: UserCellReactor? }

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View Communications - Passing user data // ProfileViewReactor struct State { var user: User? var userCellReactor: UserCellReactor? } // ProfileViewController cell.user = reactor.currentState.user

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View Communications - Passing user data // ProfileViewReactor struct State { var user: User? var userCellReactor: UserCellReactor? } // ProfileViewController cell.user = reactor.currentState.user cell.reactor = reactor.currentState.userCellReactor

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Testing View and Reactor What to test? View Reactor

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Testing View and Reactor What to test? View Action: on user interaction → action sent? Reactor

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Testing View and Reactor What to test? View Action: on user interaction → action sent? State: on state change → view updated? Reactor

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Testing View and Reactor What to test? View Action: on user interaction → action sent? State: on state change → view updated? Reactor State: on action receive → state updated?

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Testing View and Reactor How to test?

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Testing View and Reactor How to test? Reactor.stub()

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Testing View and Reactor How to test? Reactor.stub() state: set fake state

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Testing View and Reactor How to test? Reactor.stub() state: set fake state action: send fake action

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Testing View and Reactor How to test? Reactor.stub() state: set fake state action: send fake action actions: log received actions

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Testing View and Reactor - View Action

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Testing View and Reactor - View Action When: follow button taps Then: sends follow action

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Testing View and Reactor - View Action // given let reactor = ProfileViewReactor() // when // then

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Testing View and Reactor - View Action // given let reactor = ProfileViewReactor() reactor.stub.isEnabled = true // when // then

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Testing View and Reactor - View Action // given let reactor = ProfileViewReactor() reactor.stub.isEnabled = true reactor.stub.state.value.user = User() // when // then

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Testing View and Reactor - View Action // given let reactor = ProfileViewReactor() reactor.stub.isEnabled = true reactor.stub.state.value.user = User() let viewController = ProfileViewController() viewController.reactor = reactor // when let button = viewController.userCell.followButton // then

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Testing View and Reactor - View State When: following the user Then: button is selected

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Testing View and Reactor - View State // given let cellReactor = UserCellReactor() // when // then

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Testing View and Reactor - View State // given let cellReactor = UserCellReactor() cellReactor.stub.isEnabled = true // when // then

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Testing View and Reactor - View State // given let cellReactor = UserCellReactor() cellReactor.stub.isEnabled = true let cell = UserCell() cell.reactor = cellReactor // when // then

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Testing View and Reactor - View State // given let cellReactor = UserCellReactor() cellReactor.stub.isEnabled = true let cell = UserCell() cell.reactor = cellReactor // when cellReactor.stub.state.value.isFollowing = true // then

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Testing View and Reactor - Reactor State When: receive follow action Then: update following state ProfileView Reactor

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Testing View and Reactor - Reactor State // given let reactor = ProfileViewReactor() // when // then

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Testing View and Reactor - Reactor State // given let reactor = ProfileViewReactor() // when reactor.action.onNext(.follow) // then

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Testing View and Reactor - Reactor State // given let reactor = ProfileViewReactor() // when reactor.action.onNext(.follow) // then let user = reactor.currentState.user XCTAssertEqual(user?.isFollowing, true)

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Future Ideas Development Documentation Community

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Development Testing Support SectionReactor AlertReactor ModelReactor Plugins ... Nested stub Dummy reactor ... Building Extensions

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Documentation Best Practices Translations Code-level Documentation

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Community RxSwift Slack #reactorkit (English) https://rxswift-slack.herokuapp.com Swift Korea Slack #reactorkit (Korean) http://slack.swiftkorea.org

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https://reactorkit.io