swift笔记--生命周期

//完成加载时

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {}

//将要进入非活动状态时

func applicationWillResignActive(_ application: UIApplication) {}

//程序被推动到后台时

func applicationDidEnterBackground(_ application: UIApplication) {}

//程序从后台重新回到前台时

func applicationWillEnterForeground(_ application: UIApplication) {}

//当程序进入活动状态时

func applicationDidBecomeActive(_ application: UIApplication) {}

//将程序将要退出时 （保存数据，清理）

func applicationWillTerminate(_ application: UIApplication) {}