hidesBottomBarWhenPushed永远隐藏TabBar

Question

我使用的是Xcode11.2，项目的最低iOS部署目标是iOS 12.4。

我在根页面上有一个TabBarController，在其中一个选项卡上有FirstViewController。当我从FirstViewController推送SecondViewController时，我希望隐藏选项卡栏。我使用hidesBottomBarWhenPushed属性来隐藏选项卡栏。

当我按下SecondViewController时，选项卡栏是隐藏的，但当我弹出SecondViewController并移回FirstViewController时，选项卡栏仍然隐藏。

当移回FirstViewController时，我尝试了几种方法将hidesBottomBarWhenPushed设置为false，但都不起作用。

如何在弹出到FirstViewController时重新显示选项卡栏？

class FirstViewController: UIViewController {

    @IBAction func buttonTap(_ sender: Any) {
        let vc2 = SecondViewController()

        // Set to Hide TabBar
        hidesBottomBarWhenPushed = true

        navigationController?.pushViewController(vc2, animated: true)
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        // This Does Not Work
        hidesBottomBarWhenPushed = false
    }
}

class SecondViewController: UIViewController {

    /*
        All The Followings Does Not Work
    */

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

        hidesBottomBarWhenPushed = false
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        hidesBottomBarWhenPushed = false
    }

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)

        hidesBottomBarWhenPushed = false
    }
}

Answer 1

关键是从SecondViewController外部将hidesBottomBarWhenPushed设置为true。

下面的代码就是我需要编写的全部代码。

class FirstViewController {

    func pushSecondViewController {
        let vc = SecondViewController()
        vc.hidesBottomBarWhenPushed = true // <- Here
        navigationController?.push
        navigationController?.pushViewController(vc, animated: true)
    }
}