Mac Catalyst cannot capture .command key modifier with pressesBegan override

Hello!

I'm developing a remote desktop control application for iOS that must be able to capture all keyboard input on the device including the Cmd key (equivalent to Super / Start key on non Mac keyboards) when the app is in the foreground in order to send them to the remote desktop.

I have not yet tried to see if an iOS device with an external keyboard sees the .command key modifier, but when I enabled Mac Catalyst support and installed the app on my Mac and added the following methods to AppDelegate:

Code Block swift
    override func pressesBegan(_ presses: Set<UIPress>,
                               with event: UIPressesEvent?) {
        super.pressesBegan(presses, with: event)
        print(presses.first?.key, presses.first?.key?.modifierFlags)
    }
    override func pressesEnded(_ presses: Set<UIPress>,
                               with event: UIPressesEvent?) {
        super.pressesEnded(presses, with: event)
        print(presses.first?.key, presses.first?.key?.modifierFlags)
    }
    override func pressesCancelled(_ presses: Set<UIPress>,
                                   with event: UIPressesEvent?) {
        super.pressesCancelled(presses, with: event)
        print(presses.first?.key, presses.first?.key?.modifierFlags)
    }

I was able to capture pretty much any key combination I try except when the Cmd key is also in the key-combination. When the Cmd key is in the key combination or pressed alone, there is absolutely nothing sent to the app. The event appears to be reserved and consumed by Mac OS X completely.

For completeness to this post, I'd like to add that I tried removing all the menus from the app as well just in case the menu was to blame for consuming the Cmd key events, but nothing changed:

Code Block swift
    override func buildMenu(with builder: UIMenuBuilder) {
        if builder.system == .main {
            builder.remove(menu: .edit)
            builder.remove(menu: .format)
            builder.remove(menu: .help)
            builder.remove(menu: .file)
            builder.remove(menu: .window)
            builder.remove(menu: .view)
            let dummyCommand = UICommand(title: "Dummy",
                      action: #selector(dummy),
                      discoverabilityTitle: "dummy")
            let mainMenu = UIMenu(title: "Dummy", image: nil, identifier: UIMenu.Identifier("dummy"), options: .displayInline, children: [dummyCommand])
            builder.replace(menu: .application, with: mainMenu)
        }
    }

I've also tried putting the app into fullscreen mode to no avail.

Any other suggestions on how I can capture the .command modifier?

If there is no way to detect .command, is this a bug or intended behavior?

Thank you very much!
iordan