NSView keyDown/keyUp ignores specific keys in Swift. How do I make it listen to all keys?

Question

I have written this code. My problem is, the keyDown function only listens to certain keys (letters, numbers, space, characters, Tab.). However, it completely ignores keys like caps lock and ⇧ Shift and Control. How can I make it listen to these keys?

class GameClient: NSView {
    override var acceptsFirstResponder: Bool {
        return true
    }
    override func keyDown(with event: NSEvent) {
        print(event.keyCode)
    }
    override func keyUp(with event: NSEvent) {

    }
}

The answers in the suggested dupe don't fully answer my question. I don't want to see if ⇧ Shift was being pressed while I was pressing A, I want to detect when ⇧ Shift alone is pressed, for example.

Does this answer your question? https://stackoverflow.com/q/9268045/3141234 — Alexander, Feb 04 '20 at 17:15
@Alexander-ReinstateMonica I am afraid those answers might be obsolete/not fully answer my question. — , Feb 04 '20 at 17:25

score 1 · Answer 1 · edited Feb 04 '20 at 19:01

1

The question is how to capture a standalone shift key event, rather than detecting if shift is being pressed while another key is. You want to do this:

override func flagsChanged(with event: NSEvent) {
    print(event.keyCode)
}
override func keyDown(with event: NSEvent) {
    print(event.keyCode)
}
override func keyUp(with event: NSEvent) {

}

edited Feb 04 '20 at 19:01

matt

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answered Feb 04 '20 at 18:32

Is this the answer to your question? If not, do not put it in the Answer field. – matt Feb 04 '20 at 18:44
@matt I DID answer the question – Feb 04 '20 at 18:51
Ok it was the address to Alexander that confused me. – matt Feb 04 '20 at 19:00
@0x10 `flagsChanged` gets called when modifiers like `shift` change, even without another key being pressed. – Alexander Feb 04 '20 at 21:02
@Alexander-ReinstateMonica That is EXACTLY the point! – Feb 04 '20 at 21:55

NSView keyDown/keyUp ignores specific keys in Swift. How do I make it listen to all keys?

1 Answers1