Catalyst侧栏

Question

我正在学习苹果的这篇教程。我卡在下面显示的内容上了，我一直收到一个错误，Use of unresolved identifier 'window'

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    let splitViewController = window!.rootViewController as! UISplitViewController
    let navigationController = splitViewController.viewControllers[splitViewController.viewControllers.count-1] as! UINavigationController
    navigationController.topViewController!.navigationItem.leftBarButtonItem = splitViewController.displayModeButtonItem

    // Add a translucent background to the primary view controller.
    splitViewController.primaryBackgroundStyle = .sidebar

    splitViewController.delegate = self

    return true
}

有什么建议吗？

Answer 1

这很简单。默认情况下，Catalyst应用是基于窗口场景的。你这里没有窗户。苹果的教程已经过时了。

解决方案是创建自己的窗口并将其填充到didFinish中……

更正确的方法是将代码添加到场景的代理中。