GoodReactor is an adaptation of the Reactor framework that is Redux inspired. The view model communicates with the view controller via the State and with the Coordinator via the navigation function. You communicate to the viewModel via Actions Viewmodel changes state in the Reduce function Viewmodel interactes with dependencies outside of the Reduce function not to create side-effects
Link to the original reactor kit: https://github.com/ReactorKit/ReactorKit
Create a Package.swift file and add the package dependency into the dependencies list.
Or to integrate without package.swift add it through the Xcode add package interface.
import PackageDescription
let package = Package(
name: "SampleProject",
dependencies: [
.Package(url: "https://github.com/GoodRequest/GoodReactor" from: "addVersion")
]
)In your ViewModel define State, Actions and Mutations
- State defines all data that you work with
- Action user actions that are sent from the ViewController.
- Mutation represents state changes.
struct State {
var counterValue: Int
}
enum Action {
case updateCounterValue(CounterMode)
case goToAbout
}
enum Mutation {
case counterValueUpdated(Int)
}In the mutate function define what will happen when certain actions are called:
func mutate(action: Action) -> AnyPublisher<Mutation, Never> {
switch action {
case .updateCounterValue(let mode):
return updateCounter(mode: mode)
}
}
func updateCounter(mode: CounterMode) -> AnyPublisher<Mutation,Never> {
var actualValue = currentState.counterValue
switch mode {
case .increase:
actualValue += 1
case .decrease:
actualValue -= 1
}
return Just(.counterValueUpdated(actualValue)).eraseToAnyPublisher()
}Finally in the reduce function define state changes according to certain mutation:
func reduce(state: State, mutation: Mutation) -> State {
var state = state
switch mutation {
case .counterValueUpdated(let newValue):
state.counterValue = newValue
}
return state
}From ViewController you can send actions to ViewModel via Combine just like in our GoodReactor-Sample or like this:
viewModel.send(event: yourAction)Then use combine to subscribe to state changes, so every time the state is changed, ViewController is updated as well:
viewModel.state
.map { String($0.counterValue) }
.removeDuplicates()
.assign(to: \.text, on: counterValueLabel, ownership: .weak)
.store(in: &cancellables)When viewModel's action is called, navigation function is called as well. There you can hande the app flow, for example:
func navigate(action: Action) -> AppStep? {
switch action {
case .goToAbout:
return .home(.goToAbout)
default:
return .none
}
}GoodReactor repository is released under the MIT license. See LICENSE for details.