Simple observable
Very simple Observable and Publisher implementation for iOS apps.
Useful if you want to use a bit of simple reactive programming but do not want to add the full RxSwift or use Combine.
Observable
Create an Observable instance providing a default value.
let isLoading = Observable<Bool>(false)
you can assign and read the value of this observable using the value property, for example when using it in a view model
isLoading.value = true
You can bind to the value changes using the bind function, for example in a view controller
viewModel.isLoading.bind { [weak self] isLoading in
self?.loadingView.isHidden = !isLoading
}
You can also use a version of bind that accepts a keypath
viewModel.isLoading.bind(to: userDetailsView, keyPath: \.isHidden)
Publisher
Publisher is an observable without an initial value. An Observable is used for storing state, a Publisher is used for events.
After you create a Publisher instance
let onError = Publisher<Error>()
you can publish new values to this publisher with the publish method, for example when using it in a view model
onError.publish(ApiError.InvalidCredentials)
You can bind to the value changes using the bind function, for example in a view controller
viewModel.onError.bind { [weak self] error in
self?.showAlert(error)
}
ObservableButton
ObservableButton can be created in code or used from a storyboard. You can use the ObservableButton to easily subscribe to the tap event
loginButton.observable.tap.bind { [weak self] in
self?.login()
}
Good to know
You can bind to an observable or an publisher just once. This is not a technical limitation but a design decision.
Boith observable and publisher always call the bind method on the main thread so no need to worry about binding changes to UI elements.
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