ios - 在Canvas SwiftUI上崩溃

我正在用新的iOS框架SwiftUI实现一个小应用程序。我正在使用@EnvironmentObject将数据绑定(bind)到 View 。一切正常，但是Canvas崩溃并没有显示任何内容。为什么？

struct CompetitionsListSwiftUIView : View {

    @EnvironmentObject var competitionsViewModel: CompetitionsViewModel

    var body: some View {
        List(self.competitionsViewModel.competitions.identified(by: \.id)) { competition in
                CompetitionCellSwiftUIView(competition: competition)
            }
    }
}

#if DEBUG
struct CompetitionsListSwiftUIView_Previews : PreviewProvider {
    static var previews: some View {
        CompetitionsListSwiftUIView()
    }
}
#endif

Canvas 的错误消息是这样的:

Error Domain=render service Code=12 "Rendering service was interrupted" UserInfo={NSLocalizedDescription=Rendering service was interrupted}

最佳答案

尝试将环境对象添加到预览中:

#if DEBUG
struct CompetitionsListSwiftUIView_Previews : PreviewProvider {
    static var previews: some View {
        CompetitionsListSwiftUIView()
          .environmentObject(CompetitionsViewModel())
    }
}
#endif