A couple of abstractions useful in situations where you want to display some loadable content (whatever it is - news feed, image loaded from a URL or an output image from a filter or anything else)

Example.swift

import SwiftUI

LoadableResourceView(resourceProvider) { loadableResource in
    SomeView(loadableResource)
}

LoadableResourceProviding.swift

import SwiftUI

public protocol LoadableResourceProviding: ObservableObject {
    associatedtype Resource
    
    var loadableResource: LoadableResource<Resource> { get }
    
    func loadResource()
}

extension LoadableResourceProviding {
    var loadedResource: Resource? {
        loadableResource.loadedResource
    }
}

public enum LoadableResource<Resource> {
    case
        idle,
        loading(percentageLoaded: Int),
        loaded(Resource),
        failed
    
    init(_ resource: Resource) {
        self = .loaded(resource)
    }
    
    var loadedResource: Resource? {
        if case let LoadableResource.loaded(resource) = self {
            return resource
        }
        
        return nil
    }
}

LoadableResourceView.swift

import SwiftUI

struct LoadableResourceView<ResourceProvider>: View where ResourceProvider: LoadableResourceProviding {
    @StateObject var resourceProvider: ResourceProvider
    
    let buildViewFor: (LoadableResource<ResourceProvider.Resource>) -> AnyView
    
    var body: some View {
        buildViewFor(resourceProvider.loadableResource)
            .onAppear(perform: resourceProvider.loadResource)
    }
}