1. 從self.navigationController.viewControllers中拿出需要保留的View Controller放到一個數組中
2. 向數組中添加需要push的View Controller
3. 調用[self.navigationController setViewControllers:array animated:YES]
1. 從self.navigationController.viewControllers中拿出需要保留的View Controller放到一個數組中
2. 向數組中添加需要push的View Controller
3. 調用[self.navigationController setViewControllers:array animated:YES]