Swift media key event handling

MediaApplication.swift

import Cocoa

class MediaApplication: NSApplication {
    override func sendEvent(event: NSEvent) {
        if (event.type == .SystemDefined && event.subtype.rawValue == 8) {
            let keyCode = ((event.data1 & 0xFFFF0000) >> 16)
            let keyFlags = (event.data1 & 0x0000FFFF)
            // Get the key state. 0xA is KeyDown, OxB is KeyUp
            let keyState = (((keyFlags & 0xFF00) >> 8)) == 0xA
            let keyRepeat = (keyFlags & 0x1)
            mediaKeyEvent(Int32(keyCode), state: keyState, keyRepeat: Bool(keyRepeat))
        }
        
        super.sendEvent(event)
    }
    
    func mediaKeyEvent(key: Int32, state: Bool, keyRepeat: Bool) {
        // Only send events on KeyDown. Without this check, these events will happen twice
        if (state) {
            switch(key) {
            case NX_KEYTYPE_PLAY:
                /* You can provide logic here. You have the option of calling functions
                 * in your app's NSApplicationDelegate
                 * 
                 * Examples:
                 * Call a function named 'printMessage' in the NSApplicationDelegate
                 * delegate!.performSelector("printMessage")
                 * printMessage looks like the following:
                 * func printMessage() {
                 *     print("Hello World")
                 * }
                 *
                 * Call a function named 'printMessage' that takes a single argument
                 * Note that we have now added a : after the function name
                 * delegate!.performSelector("printMessage:", withObject: "Hello World")
                 * printMessage looks like the following:
                 * func printMessage(arg: String) {
                 *     print(arg)
                 * }
                 *
                 * Call a function named 'printMessage' that takes two arguments.
                 * The max number of arguments you can send is two
                 * Note that we have now added two : after the function name
                 * delegate!.performSelector("printMessage::", withObject: "Hello", withObject: "World")
                 * printMessage looks like the following:
                 * func printMessage(arg: String, _ arg2: String) {
                 *     print("\(arg) \(arg2)")
                 * }
                 */
                print("Play")
                break
            case NX_KEYTYPE_FAST:
                print("Next")
                break
            case NX_KEYTYPE_REWIND:
                print("Prev")
                break
            default:
                break
            }
        }
    }
}

Credit goes to Quentin Carnicelli and Peter Maurer. All I did was take the code snippet and make it work with Swift.