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错误解决：

SwiftUI tutorials Fatal error: No ObservableObject of type UserData found.

• 保证两个点：

1. 添加.environmentObject(UserData())在两个地方：
2. 第一个页面的 static var previews：some View{}中
3. SceneDelagete.swift文件中，let contentView = xxx（你的第一个页面）.environmentObject(UserData())

我解决的代码：

// LandmarkList.swiftstruct LandmarkList_Previews: PreviewProvider {
       static var previews: some View {
                   LandmarkList()                .previewDevice(PreviewDevice(rawValue: "iPhone 8"))         .environmentObject(UserData())         }         }//SceneDelegate.swift    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
           // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).        // Create the SwiftUI view that provides the window contents.        // 这里是重点！！！！        let contentView = LandmarkList().environmentObject(UserData())        // Use a UIHostingController as window root view controller.        if let windowScene = scene as? UIWindowScene {
               let window = UIWindow(windowScene: windowScene)            window.rootViewController = UIHostingController(rootView: contentView)            self.window = window            window.makeKeyAndVisible()        }    }

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