if let keyCombo = KeyCombo(key: .b, cocoaModifiers: [.command, .control]]) {
   let hotKey = HotKey(identifier: "CommandControlB", keyCombo: keyCombo, target: self, action: #selector())
   hotKey.register() // or HotKeyCenter.shared.register(with: hotKey)
}

if let keyCombo = KeyCombo(key: .b, cocoaModifiers: [.command, .control]) {
    let hotKey = HotKey(identifier: "CommandControlB", keyCombo: keyCombo) { hotKey in
        // Called when ⌘ + Control + B is pressed
    }
    hotKey.register()
}        

if let keyCombo = KeyCombo(doubledCocoaModifiers: .command) {
   let hotKey = HotKey(identifier: "CommandDoubleTap", keyCombo: keyCombo, target: self, action: #selector())
   hotKey.register() // or HotKeyCenter.shared.register(with: hotKey)
}

if let keyCombo = KeyCombo(doubledCarbonModifiers: controlKey) {
   let hotKey = HotKey(identifier: "ControlDoubleTap", keyCombo: keyCombo, target: self, action: #selector())
   hotKey.register() // or HotKeyCenter.shared.register(with: hotKey)
}

HotKeyCenter.shared.unregisterAll()

HotKeyCenter.shared.unregisterHotKey(with: "identifier")

let hotKey = HotKey(identifier: "identifier", keyCombo: KeyCombo, target: self, action: #selector())
hotKey.unregister() // or HotKeyCenter.shared.unregister(with: hotKey)