在iPad屏幕中，它不显示拆分视图

Question

在此拆分视图中，如果我拖动它正在显示，并且如果我选择一个索引，它不会显示在标签上

class ListTableViewController: UITableViewController {
    let names = ["One","Two","Three","Four","Five","Six","Seven","Eight","Nine","Ten"]
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    // MARK: - Table view data source
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return names.count
    }
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "CellIdentifier", for: indexPath)
        cell.isSelected = true
        cell.textLabel?.text = names[indexPath.row]
        return cell
    }
    // MARK:- Storyboard segue
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if (segue.identifier == "ShowDetailIdentifier") {
            var detail: DetailsViewController
            if let navigationController = segue.destination as? UINavigationController {
                detail = navigationController.topViewController as! DetailsViewController
            } else {
                detail = segue.destination as! DetailsViewController
            }
            if let path = tableView.indexPathForSelectedRow {
                detail.selectedIndex = path.row + 1
            }
        }
    }

主视图控制器中的代码

  @IBOutlet weak var numberLabel: UILabel!
        var selectedIndex:Int = 1
        override func viewDidLoad() {
            super.viewDidLoad()
            numberLabel?.text = "(selectedIndex)"
            print(selectedIndex)
            if splitViewController?.responds(to: #selector(getter: UISplitViewController.displayModeButtonItem)) == true {
                navigationItem.leftBarButtonItem = splitViewController?.displayModeButtonItem
                navigationItem.leftItemsSupplementBackButton = true
            }

详细信息视图控制器中的代码

class SplitViewController: UISplitViewController,UISplitViewControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        splitViewController?.preferredDisplayMode = .primaryOverlay
        splitViewController?.delegate = self
                     // Do any additional setup after loading the view.
    }
    func splitViewController(_ splitViewController: UISplitViewController,
                             collapseSecondary secondaryViewController: UIViewController,
                             onto primaryViewController: UIViewController) -> Bool {
        return true
    }

拆分视图控制器的代码

Answer 1

你缺少这个a tableView.reloadData(( on your viewDidLoad or viewDidAppear

Answer 2

我看不出你在哪里初始化拆分视图控制器，你需要传递 TableViewController 和 detailViewController。您需要在继承UISplitViewController的类的viewDidLoad中传递它

self.viewControllers = [masterNav, detail]

并且要始终显示 SplitViewController 您需要这个

self.displayMode = .allVisible