swift - 如何在搜索页面上将searchBar设置为Siri的全局焦点？

Question

描述

在我的 tvOS 应用程序中，我有一个搜索页面，顶部有一个 Search Bar，下面有一个 Table View，其中包含最终的结果列表。

当我们关注 searchBar 并且用户按下 Siri 的声音时，结果将插入到搜索栏中(如预期的那样)。但是，当用户向下滚动结果而无法找到他们要查找的内容时，他们必须向上滚动(一直向上滚动)到 searchBar 才能再次使用 Siri。

如果用户在 searchBar 不在焦点上时尝试使用 Siri，则全局 Siri 会开始在不同的应用程序中寻找结果(这不是我想要的)

问题:

如何在Search Page上设置searchBar为Siri的全局焦点？

我尝试过的:

老实说，我不知道该怎么做..

在 AppDelegate.swift 中调用一个函数来创建搜索 View Controller 并将其添加到标签栏 Controller 。

我曾考虑过尝试使用 preferedFocusView，但在阅读了文档后，我怀疑这是否可行。

func configueSearchController() -> UIViewController {

        let storyboard = UIStoryboard(name: "Search", bundle: nil)
        guard let searchResultsController = storyboard.instantiateViewController(withIdentifier: SearchViewController.storyboardIdentifier) as? SearchViewController else {
            fatalError("Unable to instatiate a SearchResultViewController from the storyboard.")
        }

        /*
         Create a UISearchController, passing the `searchResultsController` to
         use to display search results.
         */

        let searchController = UISearchController(searchResultsController: searchResultsController)
        searchController.searchResultsUpdater = searchResultsController
        searchController.searchBar.placeholder = NSLocalizedString("Enter keyword (e.g. Gastric Bypass)", comment: "")
        searchController.view.backgroundColor = Constants.Color.backgroundcolor
        searchController.searchBar.keyboardAppearance = UIKeyboardAppearance.dark
        searchController.searchBar.tintColor = Constants.Color.backgroundcolor
        searchController.searchBar.backgroundColor = Constants.Color.backgroundSearchBarColor
        searchController.searchBar.setTextColor(color: .white)
        searchController.hidesNavigationBarDuringPresentation = false
        searchController.obscuresBackgroundDuringPresentation = true
        searchController.searchBar.searchBarStyle = .minimal
        searchController.searchBar.sizeToFit()
        searchController.searchBar.focus


        //TODO: Check if this works
        searchController.searchBar.accessibilityLanguage = "en"

        //searchResultsController.tableView.tableHeaderView = searchController.searchBar

        // Contain the `UISearchController` in a `UISearchContainerViewController`.
        let searchContainer: UISearchContainerViewController = UISearchContainerViewController(searchController: searchController)

        // Finally contain the `UISearchContainerViewController` in a `UINavigationController`.
        let searchNavigationController = UINavigationController(rootViewController: searchContainer)
        searchNavigationController.navigationBar.isTranslucent = true
        searchNavigationController.navigationBar.tintColor = Constants.Color.backgroundcolor
        searchNavigationController.tabBarItem.title = "Search"
        return searchNavigationController

}

Answer 1

请阅读http://nerds.airbnb.com/tvos-focus-engine/使控件可聚焦。