点击Run：
2012-08-10 16:41:45.019 Autosize[955:c07] - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
2012-08-10 16:41:45.042 Autosize[955:c07] - (void)viewDidLoad
2012-08-10 16:41:45.043 Autosize[955:c07] - (void)viewWillAppear:(BOOL)animated
2012-08-10 16:41:45.048 Autosize[955:c07] - (void)applicationDidBecomeActive:(UIApplication *)application
2012-08-10 16:41:45.058 Autosize[955:c07] - (void)viewDidAppear:(BOOL)animated
点击HOME：
2012-08-10 16:42:00.939 Autosize[955:c07] - (void)applicationWillResignActive:(UIApplication *)application
2012-08-10 16:42:00.941 Autosize[955:c07] - (void)applicationDidEnterBackground:(UIApplication *)application
双击HOME、点开程序：
2012-08-10 16:42:04.154 Autosize[955:c07] - (void)applicationWillEnterForeground:(UIApplication *)application
2012-08-10 16:42:04.163 Autosize[955:c07] - (void)applicationDidBecomeActive:(UIApplication *)application