SwiftUI: Change “About View” in macOS app

Question

I am building a macOS-app using SwiftUI and the new App lifecycle.

I would love to change the contents of the “About Window” (that appears when you tap “About DemoApp” in the apps’ menu) but have no idea how:

How can I replace the About view with a custom one?

Answer 1

You can do it but it does require creating an AppDelegate. Here's what your AppFile should look like:

struct MyApp: App {
    @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

    var body: some Scene {
        WindowGroup {
            MainView()
        }
        .commands {
            CommandGroup(replacing: CommandGroupPlacement.appInfo) {
                Button(action: {
                    appDelegate.showAboutPanel()
                }) {
                    Text("About My App")
                }
            }
        }
    }
}

and your AppDelegate Should Look like this:

class AppDelegate: NSObject, NSApplicationDelegate {
    private var aboutBoxWindowController: NSWindowController?

    func showAboutPanel() {
        if aboutBoxWindowController == nil {
            let styleMask: NSWindow.StyleMask = [.closable, .miniaturizable,/* .resizable,*/ .titled]
            let window = NSWindow()
            window.styleMask = styleMask
            window.title = "About My App"
            window.contentView = NSHostingView(rootView: AboutView())
            aboutBoxWindowController = NSWindowController(window: window)
        }

        aboutBoxWindowController?.showWindow(aboutBoxWindowController?.window)
    }
}

Then, just make a SwiftUI View named AboutView and it'll display that in your About Box. For Example:

struct AboutView: View {
    var body: some View {
        VStack {
            Spacer()
            HStack {
                Spacer()
                Text("Hello, World!")
                Spacer()
            }
            Spacer()
        }
        .frame(minWidth: 300, minHeight: 300)
    }
}

Answer 2

You need to add a Credits.rtf file to your Bundle. This will be automatically detect and be inserted in the About Dialog.

You can find more here

Answer 3

import Foundation
import SwiftUI

struct AboutView: View {
    var body: some View {
        VStack(spacing: 10) {
            Image(nsImage: NSImage(named: "AppIcon")!)
            
            Text("\(Bundle.main.appName)")
                .font(.system(size: 20, weight: .bold))
                // Xcode 13.0 beta 2
                //.textSelection(.enabled)
            
            Link("\(AboutView.offSiteAdr.replace(of: "http://", to: ""))", destination: AboutView.offCiteUrl )
            
            Text("Ver: \(Bundle.main.appVersionLong) (\(Bundle.main.appBuild)) ")
                // Xcode 13.0 beta 2
                //.textSelection(.enabled)
            
            Text(Bundle.main.copyright)
                .font(.system(size: 10, weight: .thin))
                .multilineTextAlignment(.center)
        }
        .padding(20)
        .frame(minWidth: 350, minHeight: 300)
    }
}

///////////////////////////////////
/// HELPERS
//////////////////////////////////
class AppDelegate: NSObject, NSApplicationDelegate {
    private var aboutBoxWindowController: NSWindowController?
    
    func showAboutWnd() {
        if aboutBoxWindowController == nil {
            let styleMask: NSWindow.StyleMask = [.closable, .miniaturizable,/* .resizable,*/ .titled]
            let window = NSWindow()
            window.styleMask = styleMask
            window.title = "About \(Bundle.main.appName)"
            window.contentView = NSHostingView(rootView: AboutView())
            window.center()
            aboutBoxWindowController = NSWindowController(window: window)
        }
        
        aboutBoxWindowController?.showWindow(aboutBoxWindowController?.window)
    }
}

extension AboutView {
    private static var offSiteAdr: String { "http://www.taogit.com" }
    private static var offEmail: String { "[email protected]" }
    
    public static var offCiteUrl: URL { URL(string: AboutView.offSiteAdr )! }
    public static var offEmailUrl: URL { URL(string: "mailto:\(AboutView.offEmail)")! }
}
extension Bundle {
    public var appName: String { getInfo("CFBundleName")  }
    //public var displayName: String {getInfo("CFBundleDisplayName")}
    //public var language: String {getInfo("CFBundleDevelopmentRegion")}
    //public var identifier: String {getInfo("CFBundleIdentifier")}
    public var copyright: String {getInfo("NSHumanReadableCopyright").replace(of: "\\\\n", to: "\n") }
    
    public var appBuild: String { getInfo("CFBundleVersion") }
    public var appVersionLong: String { getInfo("CFBundleShortVersionString") }
    //public var appVersionShort: String { getInfo("CFBundleShortVersion") }
    
    fileprivate func getInfo(_ str: String) -> String { infoDictionary?[str] as? String ?? "⚠️" }
}

And assign to menu line:

struct MyApp: App {
    @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

    var body: some Scene {
        WindowGroup {
            MainView()
        }
        // Replacement of standard About window
        .commands {
            CommandGroup(replacing: CommandGroupPlacement.appInfo) {
                Button("About \(Bundle.main.appName)") { appDelegate.showAboutWnd() }
            }
        }
    }
}

result:

Bonus: Support of "\n" in Copyright