iOS Swift - 在Container视图中实现SplitViewController

Question

我遵循本教程link

但是我从一开始就做了一个改变。

我添加了一个ViewController（并使其成为初始视图控制器）并在其中添加了一个容器视图。

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

一切顺利，直到我完成这一步：

  

转到AppDelegate.swift并用以下内容替换application（_：didFinishLaunchingWithOptions :)的实现：

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

如何修改此代码以使用我的案例？

Answer 1

在您的情况下，您无法访问AppDelegate中的uisplitviewcontroller。由于您正在使用Container Embedded视图，如下图所示。您可以从第一个viewController的prepareFor segue获得UISplitviewcontroller的参考。因此，不要在AppDelegate中编写代码，而是尝试在初始viewController中准备segue。

初始ViewController             class ViewController：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
                }

            }
        }