如何从viewController的视图中显示UIViewController

我使用的是 UITableViewController 在一个 UIViewController 如下所示:

UITableViewController *tvc = [[UITableViewController alloc] init];
[self.view addSubview:tvc.view];

现在,在这个里面 表格控制器 我希望能够提出一个 SFSafariViewController 如有必要。我写了下面的代码:

if (showLink) {
    SFSafariViewController *sfsvc = [[SFSafariViewController alloc] initWithURL:[NSURL URLWithString:@"https://www.google.com"]];
    [self.presentingViewController.navigationController pushViewController:sfsvc animated:YES];
}

每当我运行此操作时,控制台中都会出现以下错误,但什么也没有发生:

[Warning] Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior (<SFSafariViewController: 0x7f8aef82a600>)