ContentView_Previews中的结构和类

Question

我有一个结构：

struct Item: Identifiable {
    let id = UUID()
    var isComplete: Bool = false
}

也让项目:项目

还有一堂课：

class Model: ObservableObject {
    @Published var isOn: Bool = false
    @Published var arr = [Item(isComplete: true), Item(isComplete: false), Item(isComplete: true), Item(isComplete: false), Item(isComplete: true), Item(isComplete: true)]
}

@观测ObservedObject var模型:模型

如何正确地将项目和模型放入ContentView_Previews?中

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView(
        item: <#Item#>,
        model: <#Model#>
    )
    }
}

我不知道下一步该怎么办

Answer 1

最好为ContentView添加代码。但如果看起来是这样的话：

struct ContentView: View {

    var item: Item
    @EnvironmentObject var model: Model

    var body: some View {
        // no matter what here
    }
}

你可以这样写：

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView(item: Item(isComplete: false))
            .environmentObject(Model())
    }
}