MoveTask.swift

// demonstrate advantages of moving task from view to loading state

struct FeedView: View {
    @Environment(BlueSkyClient.self) private var client
    @Environment(AppTheme.self) private var theme
    
    enum ViewState {
        case loading
        case error(String)
        case loaded([Post])
    }
    
    @State private var viewState: ViewState = .loading
    
    var body: some View {
        NavigationStack {
            List {
                switch viewState {
                case .loading:
                    ProgressView("Loading feed...")
                        .frame(maxWidth: .infinity)
                        .listRowSeparator(.hidden)
                        .task { await loadFeed() } // move task here
                        
                case .error(let message):
                    ErrorStateView(
                        message: message,
                        retryAction: { viewState = .loading } // just reset state
                    )
                    .listRowSeparator(.hidden)
                    
                case .loaded(let posts):
                    ForEach(posts) { post in
                        PostRowView(post: post)
                            .listRowInsets(.init())
                    }
                }
            }
            .listStyle(.plain)
            .refreshable { viewState = .loading } // just reset state
        }
    }
}