Installation

import SwiftUI
import Sparkle

// This view model class publishes when new updates can be checked by the user
final class CheckForUpdatesViewModel: ObservableObject {
    @Published var canCheckForUpdates = false

    init(updater: SPUUpdater) {
        updater.publisher(for: \.canCheckForUpdates)
            .assign(to: &$canCheckForUpdates)
    }
}

// This is the view for the Check for Updates menu item
// Note this intermediate view is necessary for the disabled state on the menu item to work properly before Monterey.
// See https://stackoverflow.com/questions/68553092/menu-not-updating-swiftui-bug for more info
struct CheckForUpdatesView: View {
    @ObservedObject private var checkForUpdatesViewModel: CheckForUpdatesViewModel
    private let updater: SPUUpdater
    
    init(updater: SPUUpdater) {
        self.updater = updater
        
        // Create our view model for our CheckForUpdatesView
        self.checkForUpdatesViewModel = CheckForUpdatesViewModel(updater: updater)
    }
    
    var body: some View {
        Button("Check for Updates…", action: updater.checkForUpdates)
            .disabled(!checkForUpdatesViewModel.canCheckForUpdates)
    }
}

@main
struct MyApp: App {
    private let updaterController: SPUStandardUpdaterController
    
    init() {
        // If you want to start the updater manually, pass false to startingUpdater and call .startUpdater() later
        // This is where you can also pass an updater delegate if you need one
        updaterController = SPUStandardUpdaterController(startingUpdater: true, updaterDelegate: nil, userDriverDelegate: nil)
    }
    
    var body: some Scene {
        WindowGroup {
        }
        .commands {
            CommandGroup(after: .appInfo) {
                CheckForUpdatesView(updater: updaterController.updater)
            }
        }
    }
}

A key has been generated and saved in your keychain. Add the `SUPublicEDKey` key to
the Info.plist of each app for which you intend to use Sparkle for distributing
updates. It should appear like this:

    <key>SUPublicEDKey</key>
    <string>pfIShU4dEXqPd5ObYNfDBiQWcXozk7estwzTnF9BamQ=</string>