How to do launch at login for macOS apps

Issue #757

• Use SMLoginItemSetEnabled from Service Management framework
• Use a helper background app that checks and invokes our main application
• Copy our helper app into Library/LoginItems

helper_dir="$BUILT_PRODUCTS_DIR/$CONTENTS_FOLDER_PATH/Library/LoginItems"

final class AppDelegate: NSObject, NSApplicationDelegate {
	func applicationDidFinishLaunching(_ notification: Notification) {
		let bundleId = Bundle.main.bundleIdentifier!
		// TODO: Make this more strict by only replacing at the end
		let mainBundleId = bundleId.replacingOccurrences(of: "-LaunchAtLoginHelper", with: "")

		// Ensure the app is not already running
		guard NSRunningApplication.runningApplications(withBundleIdentifier: mainBundleId).isEmpty else {
			NSApp.terminate(nil)
			return
		}

		let pathComponents = (Bundle.main.bundlePath as NSString).pathComponents
		let mainPath = NSString.path(withComponents: Array(pathComponents[0...(pathComponents.count - 5)]))
		NSWorkspace.shared.launchApplication(mainPath)
		NSApp.terminate(nil)
	}
}

Read more

• https://jogendra.dev/implementing-launch-at-login-feature-in-macos-apps
• https://github.com/sindresorhus/LaunchAtLogin/blob/master/Sources/LaunchAtLogin/copy-helper.sh