如何预览包含与其父视图状态绑定的视图? [英] How do you preview a view containing a binding to its parent view's state?

问题描述

我将此视图作为其父视图的工作表呈现

I present this view as a sheet from its parent view

struct NamesView: View {
    @Binding var match: Match

    var body: some View {
        ...
    }
}

由于 match 的真实来源在呈现此 NamesView 表的父视图中，因此在构建视图时，我传入了一个 $match 按预期绑定和数据流.

Since the match source of truth is in the parent view presenting this NamesView sheet, when the view is constructed I pass in a $match binding and data flows as intended.

但是，在预览提供程序中构建此视图时

However, when constructing this view in a preview provider

struct NamesView_Previews: PreviewProvider {
    static var previews: some View {
        NamesView()
    }
}

编译器说 NamesView() 需要一个 match 类型的参数 Binding (Match作为将此视图呈现为工作表的父视图).我不确定从这里开始的好方法是什么，或者这是否是 SwiftUI 的限制.

the compiler says that NamesView() expects a match argument of type Binding<Match> (Match being the parent view presenting this view as a sheet). I'm not sure what would be a good way to proceed from here or if this is a limitation of SwiftUI.

推荐答案

如果你只想不断预览，那么可以

If you want only constant preview, then it can be

struct NamesView_Previews: PreviewProvider {
        static var previews: some View {
            NamesView(match: .constant(Match()))
        }
    }

如果你想现场直播，它可以是

if you want it in live, the it can be

struct NamesView_Previews: PreviewProvider {
    struct BindingTestHolder: View {
        @State private var testedMatch = Match()
        var body: some View {
            NamesView(match: $testedMatch)
        }
    }

    static var previews: some View {
        BindingTestHolder()
    }
}

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