ios - 当前 View Controller 嵌入在导航 Controller 中，与选项卡栏 Controller 模态分开

Question

我有一个嵌入在导航 Controller 内的 View Controller 。该导航 Controller 是我的选项卡栏 Controller 中的第三个项目。我想以模态方式呈现 View Controller 。

这是我尝试过的，但它不运行

func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {

    // CameraView is the Storyboard ID of the VC I want to present

    if viewController is EditPreviewVideosViewController {
        if let newVC = tabBarController.storyboard?.instantiateViewController(withIdentifier: "CameraView") {

            // None of this prints
            print()
            print("new vc is allowed")
            print()
            tabBarController.navigationController?.present(newVC, animated: true, completion: {
                print("complete")
            })
            return false
        }
    }
    return true
}

Answer 1

从 tabbarController 子级获取正确的导航 Controller

if let nav = tabBarController.viewControllers[tabBarController.selectedIndex] as UINavigationController {

    nav.present(newVC, animated: true, completion: {
        print("complete")
    })
}