返回到指定界面

1.返回到tabbar中的指定界面

    self.navigationController.tabBarController.hidesBottomBarWhenPushed=NO;

    self.navigationController.tabBarController.selectedIndex=0; //0是首页主界面，以此类推

2.返回当前界面的跟视图

   UIViewController * vc = [self.navigationController.viewControllers objectAtIndex:0];    //0为一级界面，其余的自己推算

   [self.navigationController popToViewController:vc animated:YES];

3.返回上一界面，可用做返回传值

  UIViewController * vc = [self.navigationController.viewControllersobjectAtIndex:self.navigationController.viewControllers.count - 2];

  [self.navigationControllerpopToViewController:vcanimated:YES];