How can I detect that the Shift key has been pressed?

Question

I have a NSView subclass and I would like it to react when the user presses the ⇧ Shift key. However, -[NSView keyDown:] (which I curren

Answer 1

Here is the code deals with key event with swift 3.0.1 tested on Xcode 8.2.1 and macOS 10.12.2

override func keyDown(with event: NSEvent) {
    var handled = false
    if event.keyCode == 53 { // ESC, same as `CMD + .`
        handled = true
        print("ESC")
    }
    if event.modifierFlags.contains(.command) { // .shift, .option, .control ...
        if let chars = event.charactersIgnoringModifiers {
            handled = true // likely we are interested with that key
            switch chars {
            case "r":
                print("CMD + r")
            case ",":
                print("CMD + ,")
            case "/":
                print("CMD + /")
            default:
                handled = false
            }
        }
    }
    if !handled {
        super.keyDown(with: event) // let system handle it(may contains sound)
    }
}