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Time traveling with ReSwift
@EliSawic
About me
Eliasz SawickiBlog: www.eliaszsawicki.comTwitter: @EliSawic
@EliSawic
ReSwift
@EliSawic
ReSwift is a Redux-like implementation of the unidirectional data flow
architecture in Swift.@EliSawic
Plan• How did it all start?
@EliSawic
Plan• How did it all start?
• How does it work?
@EliSawic
Plan• How did it all start?
• How does it work?
• What are my thoughts?
@EliSawic
How did it all start?
@EliSawic
What do we use?
@EliSawic
React
@EliSawic
Flux
@EliSawic
Redux
@EliSawic
Unidirectional Data Flow
@EliSawic
Unidirectional Data Flow• one direction of state change
• immutable state
• modified by pure functions
@EliSawic
DevTools
@EliSawic
Recording
@EliSawic
Time travel
@EliSawic
Fun to work with
@EliSawic
Dan Abramov
@EliSawic
ReSwift
@EliSawic
How does it work?
@EliSawic
Core Elements• State
• Actions
• Reducers
• Store
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State
@EliSawic
State
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Statestruct AppState: StateType, HasNavigationState { var user: User var navigationState: NavigationState}
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Actions
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Actionsstruct UpdateUserName: Action { let name: String
init(_ name: String) { self.name = name }}
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Action Creator
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Reducer
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Reducer(Action, State?) -> State
@EliSawic
Update statefunc handleAction(action: Action, state: AppState?) -> AppState { return AppState( user: userReducer(action, user: state?.user), navState: navReducer(action, navState: state?.navState) )}
@EliSawic
Reducerfunc userReducer(action: Action, user: User?) -> User {
var resultUser = user ?? User()
switch action { case let action as UpdateUserName: resultUser.name = action.name case let action as UpdateUserSurname: resultUser.surname = action.surname case let action as UpdateUserPresentationTitle: resultUser.presentationTitle = action.title default: break }
return resultUser}
@EliSawic
Store
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Receives our letters
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Manage changes
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Notify about changes
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Storeprotocol Store { init(reducer: Reducer, state: State) func subscribe(subscriber: Subscriber) func dispatch(action: Action)}
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@EliSawic
Event
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Send letter
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Receive letters
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Manage changes
@EliSawic
Notify about changes
@EliSawic
React to state changes
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What are my thoughts?
@EliSawic
DevTools
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Remember
@EliSawic
Keep reducers fast
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No side effects in Reducers
@EliSawic
Avoid heavy application state
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One way of changing state
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Why?
@EliSawic
Easy to understand what is going on
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Easy testing
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DevTools - Time traveling, Hot
reloading
@EliSawic
Fixing bugs with friends
@EliSawic
Why not?
@EliSawic
Overwhelming
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Boilerplate
@EliSawic
Many ReSwift components are in
POC state
@EliSawic
Easy to get stuck
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Against the framework
@EliSawic
Check them out!• Karl Bowden - @karlbowden
• Benjamin Encz - @benjaminencz
• Aleksander Rendtslev - @ARendtslev
• Dan Abramov - @danAbramov
@EliSawic
Check these out!• https://karlbowden.com/reswift-prezzo/
• https://realm.io/news/benji-encz-unidirectional-data-flow-swift/
• https://github.com/reactjs/redux
• https://github.com/ReSwift/ReSwift
@EliSawic
Conclusion
@EliSawic
Thank you for your attention
@EliSawic
