方法调用的先后顺序问题

加载一个视图控制器依次调用：

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

      return YES;

}

- (void)viewDidLoad {

    [super viewDidLoad];

}

- (void)applicationDidBecomeActive:(UIApplication *)application {

}

进入后台时

- (void)applicationWillResignActive:(UIApplication *)application {

}

- (void)applicationDidEnterBackground:(UIApplication *)application {

}

重新进入前台时

- (void)applicationWillEnterForeground:(UIApplication *)application {

}

- (void)applicationDidBecomeActive:(UIApplication *)application {

}

原文：http://www.cnblogs.com/isItOk/p/4631390.html