Question

我有一个嵌入在导航控制器内部的视图控制器。此导航控制器是我的标签栏控制器内的第三个项目。我想以模态方式呈现视图控制器。

这是我尝试过的，但它没有运行

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孩子

获取正确的导航控制器

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

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

Answer 2

您正在错误的故事板中找到视图控制器

这一行

let newVC = tabBarController.storyboard?.instantiateViewController(withIdentifier: ....

应该是

let newVC = UIStoryboard.init(name: "NameOfYourStoryboardContainsVideo", bundle: nil).instantiateViewController(withIdentifier: "CameraView")

现在你的if会正确执行

当前视图控制器嵌入在导航控制器中的标签栏控制器模态

2 个答案: