TVOS : 调整 UISearchViewController 中搜索栏的位置答案

【问题标题】：TVOS : Adjust the position of searchbar in UISearchViewControllerTVOS : 调整 UISearchViewController 中搜索栏的位置
【发布时间】：2018-02-07 21:04:01
【问题描述】：

我正在开发一个 TVOS 应用程序。我使用下面的代码在 UITabBarController 中实现搜索功能。显示标签栏然后搜索栏被标签栏覆盖的问题。请参阅下面的屏幕截图。如果显示标签栏，是否可以将搜索栏位置向下移动？

let searchViewController = VVSearchViewController()
    let searchController = UISearchController(searchResultsController: searchViewController)
    searchViewController.searchViewController = searchController

    searchController.searchResultsUpdater = searchViewController

    searchController.obscuresBackgroundDuringPresentation = true

    let searchPlaceholderText = "Search"
    searchController.searchBar.placeholder = searchPlaceholderText
    searchController.searchBar.tintColor = UIColor.black
    searchController.searchBar.barTintColor = UIColor.black
    searchController.searchBar.searchBarStyle = .minimal
    searchController.searchBar.keyboardAppearance = .dark

    searchController.view.backgroundColor = UIColor.black
    searchController.definesPresentationContext = true;
    UISearchContainerViewController(searchController: searchController)

【问题讨论】：

标签： swift uisearchbar tvos uisearchcontroller

【解决方案1】：

您可以在应用程序“App Store”的标签搜索中找到完全相同的案例。

这是因为在 tvOS 中，viewController 的内容不应该对标签栏的可见性做出反应。标签栏显示在其顶部，重叠。

tvOS 标签栏的人机界面指南： https://developer.apple.com/tvos/human-interface-guidelines/interface-elements/tab-bars/

【讨论】：

【解决方案2】：

这是可能的。我花了一段时间，但我的想法是将搜索控制器添加到顶部有约束的“容器”控制器中。如果您尝试将 UISearchController 作为子视图控制器添加到容器中，则不会出现任何内容。 UISearchContainerViewController 也不能正常工作。但是以 UISearchContainerViewController 为根的导航控制器可以工作。这是我的代码：

// Create the search controller and it's results controller
        let resultsController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "SearchResultsViewController") as! SearchResultsViewController
        let searchController = UISearchController(searchResultsController: resultsController)
        searchController.searchResultsUpdater = resultsController
        
// Customize it
        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).defaultTextAttributes = [.foregroundColor: UIColor.text]

        searchController.searchBar.placeholder = NSLocalizedString("Search", comment: "")
        searchController.searchBar.tintColor = .text
        searchController.searchBar.barTintColor = .text
        searchController.searchBar.searchBarStyle = .minimal
        searchController.searchBar.keyboardAppearance = .dark

// Embed it in UISearchContainerViewController
        let searchContainerViewController = UISearchContainerViewController(searchController: searchController)
// Make UISearchContainerViewController root controller of a navigation controller
        let navController = UINavigationController(rootViewController: searchContainerViewController)
// And a container to hold everything
        let containerViewController = UIViewController()
            
// Do a standard child add of navController into containerViewController
        navController.loadViewIfNeeded()
        navController.viewWillAppear(false)
        navController.willMove(toParent: containerViewController)
        
        containerViewController.view.addSubview(navController.view)
        navController.view.frame = containerViewController.view.bounds

// Add your constraints. In this case I just want the search bar to be 150 px down.
        NSLayoutConstraint.activate([
            navController.view.topAnchor.constraint(equalTo: containerViewController.view.safeAreaLayoutGuide.topAnchor, constant: 150),
            navController.view.leftAnchor.constraint(equalTo: containerViewController.view.safeAreaLayoutGuide.leftAnchor),
            navController.view.bottomAnchor.constraint(equalTo: containerViewController.view.safeAreaLayoutGuide.bottomAnchor),
            navController.view.rightAnchor.constraint(equalTo: containerViewController.view.safeAreaLayoutGuide.rightAnchor)
        ])        containerViewController.addChild(navController)

        containerViewController.addChild(navController)
        navController.didMove(toParent: containerViewController)
        navController.viewDidAppear(false)

// And from here use the containerViewController as normal to display a search into your app.

注意：如果没有在 navController 上传递 viewDidAppear，这是行不通的。注意 2：我仅在 tvOS 13 和 14 上对此进行了测试。

【讨论】：