LoadingPublisher

Loading abstraction for Combine Publishers

based on ReactiveKit's LoadingSignal

Installation

LoadingPublisher is distributed using the Swift Package Manager. To install it into a project, simply add it as a dependency within your Package.swift manifest:

let package = Package(
    ...
    dependencies: [
        .package(url: "https://github.com/LucaGobbo/LoadingPublisher", from: "0.0.1"),
    ],
    ...
)

Then import LoadingPublisher wherever you'd like to use it:

import LoadingPublisher

Usage

LoadingPublisher adds the ability to add a generic loading state to a publisher. To indicate loading we've added the LoadingState enum, which can be in 3 states, loading, loaded and loading failed.

A publisher with elements of LoadingState type is typealiased as AnyLoadingPublisher

typealias AnyLoadingPublisher<LoadingOutput, LoadingFailure: Swift.Error> = AnyPublisher<LoadingState<LoadingOutput, LoadingFailure>, Never>

A publisher can easily be converted into an AnyLoadingPublisher by calling eraseToAnyLoadingPublisher on any publisher.

    fetchImage.eraseToAnyLoadingPublisher().sink { value in 
        switch value {
            case .loading: 
                // display loading indicator
            case .loaded(let image):
                // display image
                // stop loading indicator
            case .failure(let error):
                // display the error
                // stop loading indicator
        }
    
    }

LoadingPublisher also adds operators on AnyLoadingPublisher, mapLoadingOutput, isLoading, flatMapLatestLoading, dematerializeLoadingState and more. It also adds the LoadingPublishers namespace where we've defined some default Publishers like Zip, CombineLatests.