Detect when home button is pressed iOS

Question

I have several iOS apps that all use the same port to listen for a network beacon. On the main view I use viewWillDisappear to close the port when another view is opened, w

Answer 1

In case of Swift User

you can write it like this

override func viewDidLoad() {
    super.viewDidLoad()

    // code here...

    NSNotificationCenter.defaultCenter().addObserver(
        self,
        selector: "applicationWillResignActive:",
        name: UIApplicationWillResignActiveNotification,
        object: nil)
}

func applicationWillResignActive(notification: NSNotification) {
    print("I'm out of focus!")
}

also, Don't forget to close it when your app is terminate

deinit {

    // code here...

    NSNotificationCenter.defaultCenter().removeObserver(self)
}