I don't know if this is the right way to do it, but I managed to get it working based on the approach in this post: Cocoa Keyboard Shortcuts in Dialog without an Edit Menu
I created a similar MyApplication class and also linked the copy, paste etc actions of first responder to my menus.
I had some trouble getting the syntax right for the latest swift. Here is the code I used:
import Cocoa class MyApplication: NSApplication { override func sendEvent(event: NSEvent) { if event.type == NSEventType.KeyDown { if ((event.modifierFlags.rawValue) & (NSEventModifierFlags.CommandKeyMask.rawValue) > 0) { switch event.charactersIgnoringModifiers!.lowercaseString { case "x": if NSApp.sendAction(Selector("cut:"), to:nil, from:self) { return } case "c": if NSApp.sendAction(Selector("copy:"), to:nil, from:self) { return } case "v": if NSApp.sendAction(Selector("paste:"), to:nil, from:self) { return } case "z": if NSApp.sendAction(Selector("undo:"), to:nil, from:self) { return } case "a": if NSApp.sendAction(Selector("selectAll:"), to:nil, from:self) { return } default: break } } } return super.sendEvent(event) } }