1.- (void)applicationWillEnterForeground:(UIApplication *)application
//當前狀態:UIApplicationStateBackground
2.- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
//當前狀態:UIApplicationStateInactive !! 已經不是后臺了
3.- (void)applicationDidBecomeActive:(UIApplication *)application
//當前狀態:UIApplicationStateActive
測試設備:ios6 和 ios9
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