How do I setup the "Help" menu option for an iPad app being ported to the Mac using Mac Catalyst?

Question

By default, Mac Catalyst creates a menu titled "Help" that is supposed to include help for the application. However, I found no documentation on how to implement Help. For standard Mac apps, you can use a Help book. However, there is no mention on how to use a help book with Mac Catalyst. I attempted to add the HelpBookDirectoryName to info.plist but this did not work. Is there a way of making help books work with Mac Catalyst?

Answer 1

We use a web-based help system for our iOS app and adding this to the appropriate UIViewControllers seems to work to connect the Help menu command for our Catalyst version:

    // Show some help.
@IBAction func showHelp(_ sender: Any) {
    UIApplication.shared.open(URL(string: "http://www.ourapp.com/faq")!)
}

// Return whether action can be performed.
override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {

    if action == #selector(self.showHelp(_:)) {
        return true
    } else {
        return super.canPerformAction(action, withSender: sender)
    }
}