Open Radar

 
Summary:
UIDocumentBrowserVC comes with its own set of Key Commands, which is great. However it would be desirable to add our own keyCommands to the already existing ones like so.

override var keyCommands: [UIKeyCommand]? {
        let custom = UIKeyCommand(input: "n",
                                  modifierFlags: [.alternate, .command],
                                  action: #selector(handleCustomKeyCommand),
                                  discoverabilityTitle: “Custom Key Command“)

        guard let superCommands = super.keyCommands else { return [custom] }

        return superCommands + [custom]
    }

Steps to Reproduce:
1. create a subclass of UIDocumentBrowserVC
2. override `keyCommands` as shown in Description

Expected Results:
Both the system-provided and the custom key commands work

Actual Results:
The custom keyCommand’s discoverabilityTitle actually shows up, if you hold Command, but the KeyCommand can’t be invoked and does nothing

Version:
iOS 11.1

Notes:
Custom KeyCommands worked in an early beta, before UIDocumentBrowserVC added its own