Pause Sprite Kit scene when home button is pressed

Question

I was wondering how would i pause my sprite kit scene when home button is pressed.

I found few answers here and tried it with notification center like this.

Answer 1

By the time your application has entered the background, it's probably too late.

Instead, we should register for the UIApplicationWillResignActiveNotification notification and handle our just-before-exit code when we receive this notification.