第一阶段

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    NSLog(@"程序启动");

}

- (void)applicationDidBecomeActive:(UIApplication *)application

{

    NSLog(@"加载完毕进入主页面");

}

第二阶段

- (void)applicationWillResignActive:(UIApplication *)application

{

    NSLog(@"按下 Home");

}

- (void)applicationDidEnterBackground:(UIApplication *)application

{

    NSLog(@"回到桌面");

}

第三阶段

- (void)applicationWillEnterForeground:(UIApplication *)application

{

    NSLog(@"点击桌面图标回到程序");

}

- (void)applicationDidBecomeActive:(UIApplication *)application

{

    NSLog(@"加载完毕进入主页面");

}