问斯威夫特5: UINavigationController要到DetailsViewController才会出现

EN

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
// MARK: - Properties
var window: UIWindow?
let tabBarDelegate = TabBarDelegate()
let userAuthToken = UserDefaults.standard.string(forKey: "token")
let userKeyToken = UserDefaults.standard.string(forKey: "key")


func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    // Disable dark mode
    if #available(iOS 13.0, *) {
        window?.overrideUserInterfaceStyle = .light
    }

    // IF USER IS LOGGED IN
    if let windowScene = (scene as? UIWindowScene) {

        if let _ = userAuthToken {
            self.window = UIWindow(windowScene: windowScene)

            // CREATE TAB BAR //
            let tabController = UITabBarController()

            tabController.tabBar.backgroundColor = .white

            // Instantiate the storyboards
            let cannabisStoryboard = UIStoryboard(name: "Cannabis", bundle: nil)
            let profileStoryboard = UIStoryboard(name: "Profile", bundle: nil)


            // Instantiate the view controllers to storyboards
            let cannabisVC = cannabisStoryboard.instantiateViewController(withIdentifier: "Cannabis") as! CannabisViewController
            let profileVC = profileStoryboard.instantiateViewController(withIdentifier: "Profile") as! ProfileViewController

            // Displays the items in below order in tab bar
            let vcData: [(UIViewController, UIImage, UIImage)] = [
                (cannabisVC, UIImage(named: "Cannabis_icon")!, UIImage(named: "Cannabis_icon_selected")!),
                (profileVC, UIImage(named: "Profile_icon")!, UIImage(named: "Profile_icon_selected")!),
            ]

            let vcs = vcData.map { (vc, defaultImage, selectedImage) -> UINavigationController in
                let nav = UINavigationController(rootViewController: vc)
                nav.tabBarItem.image = defaultImage
                nav.tabBarItem.selectedImage = selectedImage

                return nav
            }

            // Assign to tab bar controller
            tabController.viewControllers = vcs
            tabController.tabBar.isTranslucent = false
            tabController.delegate = tabBarDelegate

            // Disables rendering for tab bar images
            if let items = tabController.tabBar.items {
                for item in items {
                    if let image = item.image {
                        item.image = image.withRenderingMode(UIImage.RenderingMode.alwaysOriginal)
                    }

                    if let selectedImage = item.selectedImage {
                        item.selectedImage = selectedImage.withRenderingMode(UIImage.RenderingMode.alwaysOriginal)
                    }

                    // Hides title
                    item.imageInsets = UIEdgeInsets(top: 6, left: 0, bottom: -6, right: 0)
                }
            }

            // Customize Navigation bar
            UINavigationBar.appearance().backgroundColor = UIColor(rgb: 0x00ffcc)

            // Disable dark mode
            window!.overrideUserInterfaceStyle = .light

            window?.rootViewController = tabController
            window?.makeKeyAndVisible()



        } else {
            // let loginStoryboard = UIStoryboard(name: "Login", bundle: nil)
            // let loginViewController = loginStoryboard.instantiateViewController(withIdentifier: "Login") as! LoginViewController

            // Disable dark mode
            window!.overrideUserInterfaceStyle = .light

            // window?.rootViewController = loginViewController
            window?.rootViewController = LoginViewController()
            window?.makeKeyAndVisible()
        }



        window?.windowScene = windowScene
    }

}

class CannabisViewController: UIViewController {

// MARK:- Outlets
let tableView = UITableView()

// MARK:- Properties
var cannabisDetailViewController: CannabisDetailsViewController? = nil


// Search
let searchController = UISearchController(searchResultsController: nil)
var isSearchBarEmpty: Bool { return searchController.searchBar.text?.isEmpty ?? true }
var filteredStrains = [Cannabis]()
var isFiltering: Bool { return searchController.isActive && !isSearchBarEmpty }


// MARK: - ViewWillLayoutSubViews
override func viewWillLayoutSubviews() {
    let navigationBar: UINavigationBar = UINavigationBar(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: 44))

    // navigationController?.setViewControllers([CannabisViewController()], animated: true)


    self.view.addSubview(navigationBar)
}

// MARK: - ViewDidLoad
override func viewDidLoad() {
    super.viewDidLoad()

    configurePage()


    // MARK: Self sizing table view cell
    tableView.estimatedRowHeight = CGFloat(88.0)
    tableView.rowHeight = UITableView.automaticDimension



    // MARK: DataSource/Delegate
    tableView.dataSource = self
    tableView.delegate = self


    // Removes default lines from table views
    tableView.tableFooterView = UIView()
    tableView.separatorStyle = .none


    // MARK: Navigation: logo in center
    let logoHeader = UIImageView(image: UIImage(named: "logoHeader"))
    self.navigationItem.titleView = logoHeader


    // MARK: API
    getCannabisList()


    // MARK: Search bar controller
    searchController.searchResultsUpdater = self
    searchController.obscuresBackgroundDuringPresentation = false
    searchController.searchBar.placeholder = "Search for a strain!"
    navigationItem.searchController = searchController
    definesPresentationContext = true

}


// Configure TableView
func configurePage() {
    // Configure Tableview
    view.addSubview(tableView)
    tableView.anchor(top: view.topAnchor, left: view.leftAnchor,
                     bottom: view.bottomAnchor, right: view.rightAnchor)
}

    func updateSearchResults(for searchController: UISearchController) {
    let searchBar = searchController.searchBar
    let userSearch = searchBar.text!.trimmingCharacters(in: .whitespaces)
    search(searchText: userSearch)
}