OS X / Swift: Trigger function when network configuration changes

NetworkChangeNotifier.swift

/**
 * Network Change Notifier
 *
 * Made by François 'ftiff' Levaux-Tiffreau - fti@me.com
 * 
 *
 * Simply modify "changed"
 *
 */

import Cocoa
import SystemConfiguration

let changed: SCDynamicStoreCallBack = {dynamicStore,_,_ in
    
    print("Network configuration changed")
}

var dynamicContext = SCDynamicStoreContext(version: 0, info: nil, retain: nil, release: nil, copyDescription: nil)
let dcAddress = withUnsafeMutablePointer(&dynamicContext, {UnsafeMutablePointer<SCDynamicStoreContext>($0)})

if let dynamicStore = SCDynamicStoreCreate(kCFAllocatorDefault, "io.fti.networkconfigurationchanged", changed, dcAddress){
    
    let keys: [CFStringRef] = ["State:/Network/Global/IPv4"]
    let keyPointer = UnsafeMutablePointer<UnsafePointer<Void>>(keys)
    let keysArray = CFArrayCreate(nil, keyPointer, 1, nil)
    
    SCDynamicStoreSetNotificationKeys(dynamicStore, nil, keysArray)
    
    let loop = SCDynamicStoreCreateRunLoopSource(kCFAllocatorDefault, dynamicStore, 0)
    CFRunLoopAddSource(CFRunLoopGetCurrent(), loop, kCFRunLoopDefaultMode)
    
    
    CFRunLoopRun()
}