iOS Swift - 在容器 View 中实现 SplitViewController

Question

我正在关注本教程 link

但是我从一开始就做了一个改变。

我添加了一个 ViewController(并将其设为初始 View Controller )并在其中添加了一个容器 View 。

然后我在我的 View 容器和教程的 SplitViewController 之间嵌入 seagued。

一切都很顺利，直到我到达这一步:

Go to to AppDelegate.swift and replace the implementation of application(_:didFinishLaunchingWithOptions:) with the following:

guard let splitViewController = window?.rootViewController as? UISplitViewController,
  let leftNavController = splitViewController.viewControllers.first as? UINavigationController,
  let masterViewController = leftNavController.topViewController as? MasterViewController,
  let detailViewController = splitViewController.viewControllers.last as? DetailViewController
  else { fatalError() }

let firstMonster = masterViewController.monsters.first
detailViewController.monster = firstMonster

return true

应如何修改此代码以适合我的情况？

Answer 1

在您的情况下，您无法访问 AppDelegate 中的 uisplitviewcontroller。由于您使用的是容器嵌入 View ，如下图所示。您可以从第一个 viewController 的prepareFor segue 获取 UISplitviewcontroller 的引用。因此，不要在 AppDelegate 中编写代码，而是尝试在初始 viewController 中为 segue 做准备。

初始 View Controller ViewController 类:UIViewController {

            @IBOutlet weak var containerView: UIView!
            override func viewDidLoad() {
                super.viewDidLoad()

                // Do any additional setup after loading the view.
            }

            override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

                if segue.identifier == "embedseg" {
                    guard let splitViewController = segue.destination as? UISplitViewController,
                        let leftNavController = splitViewController.viewControllers.first as? UINavigationController,
                        let masterViewController = leftNavController.topViewController as? MasterViewController,
                        let rightNavController = splitViewController.viewControllers.last as? UINavigationController,
                        let detailViewController = rightNavController.topViewController as? DetailViewController
                        else { fatalError() }

                    let firstMonster = masterViewController.monsters.first
                    detailViewController.monster = firstMonster

                    masterViewController.delegate = detailViewController

                    detailViewController.navigationItem.leftItemsSupplementBackButton = true
                    detailViewController.navigationItem.leftBarButtonItem = splitViewController.displayModeButtonItem
                }

            }
        }