let recordView = RecordView(frame: CGRect.zero)
recordView.tintColor = NSColor(red: 0.164, green: 0.517, blue: 0.823, alpha: 1)
let keyCombo = KeyCombo(doubledModifiers: .command)
recordView.keyCombo = keyCombo

func recordViewShouldBeginRecording(_ recordView: RecordView) -> Bool
func recordView(_ recordView: RecordView, canRecordShortcut keyCombo: KeyCombo) -> Bool
func recordView(_ recordView: RecordView, didChangeKeyCombo keyCombo: KeyCombo?)
func recordViewDidEndRecording(_ recordView: RecordView)

let recordView = RecordView(frame: CGRect.zero)
recordView.didChange = { keyCombo in
    guard let keyCombo = keyCombo else { return } // Clear shortcut
    // Changed new shortcut
}