为什么某些视图在小部件中显示为红色的“禁止进入"符号? [英] Why do some views appear as a red no entry sign in widgets?

问题描述

我已经用xcode 12创建了一个项目，并添加了一个Widget Extension目标.目标已创建，剩下的是一个显示时间的简单小部件.小部件的预览按预期方式工作，并且小部件在模拟器中按预期显示.但是，如果我更改视图以使用 List 而不是 Text ，如下所示:

I've created a project in xcode 12 and added a Widget Extension target. The target is created and I'm left with a simple widget that shows the time. The preview of the widget works as expected and the widget is shown as expected in the simulator. But if I change the view to use List instead of Text, like this:

struct SimpleWidgetEntryView : View {
    var entry: Provider.Entry

    var body: some View {
        List {
            Text("Something")
        }
    }
}

预览和模拟器在黄色背景上均显示红色的禁止进入"标志:

The preview and the simulator both show a red No Entry sign on a yellow background:

我尝试将 List 放入 VStack 内，并使用动态列表，但没有成功.我找不到在小部件中被禁止的任何有关 List 的文档.我尝试重新启动xcode和模拟器，进行清理和重建.我正在使用xcode 12.0 beta 3.

I've tried putting the List inside a VStack and using a dynamic list without any success. I can't find any documentation about List being prohibited in a widget. I've tried restarting xcode and the simulator, cleaning and rebuilding. I'm using xcode 12.0 beta 3.

〜我也遇到这个问题，尝试使用包装在 UIViewRepresentable 中的 UIView .该视图是Charts库中的 LineChartView .〜根据

~I also get this issue trying to use a UIView wrapped in UIViewRepresentable. The view is a LineChartView from the Charts library.~ according to this post on the Apple developer forums it isn't possible to use UIKit views in a WidgetKit widget.

有人知道我如何在小部件中使用 List 吗?任何帮助，不胜感激.谢谢

Does anyone know how I can use a List in a widget? Any help much appreciated. Thanks

推荐答案

背景

小部件视图为 静态 .

他们不支持动画，导航或用户交互( Link 除外).而且必须使用纯SwiftUI编写.

They don't support animation, navigation nor user interaction (with the exception of Link). And they must be written in pure SwiftUI.

请注意，该列表并非详尽无遗，主要提供了示例:

Note that the list is not exhaustive, provided mostly with examples:

1. 交互式视图(例如，您可以通过触摸与之进行交互的视图):

1. Interactive views (ones you can interact with, e.g., by touching them):

• 列表
• 表格
• ScrollView
• TabView
• 地图
• Picker
• 滑块
• 依此类推...

动画视图:

• ProgressView

导航视图(您不能使用标准导航-为此，您具有 Link ):

Navigation views (you can't use the standard navigation - for this you have Link):

• NavigationView
• NavigationLink

用于UIKit视图/视图控制器的UIKit包装器:

• UIViewRepresentable
• UIViewControllerRepresentable

---

替换

如果要使用以上任何视图，例如一个像 List 这样的 interactive 视图，您需要在 non-interactive 视图之外创建它-这里是 VStack + ForEach .

---

Replacements

If you want to use any of the above views, e.g. an interactive view like List, you need to create it out of non-interactive views - here VStack + ForEach.

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