Swiftui 导致缺少导航链接初始化的状态变量

我在aboutView（ContentView底部）的导航链接中遇到一些奇怪的错误：

由于“私有”保护级别，aboutView的初始值设定项不可访问

调用中缺少参数“useHomeCur”的参数

期望表达式 Xcode还建议我在ContentView中插入'useHomeCur'

我不会在任何其他视图中看到这些错误。 aboutView.swift中未出现任何错误。它的行为就像aboutView是ContentView的子视图一样。它希望我在ContentView中定义一个aboutView状态参数。为什么？如果我在aboutView中文本输出状态参数和选项，那么效果会很好

我还尝试了：.navigationBarItems（尾部：NavigationLink（目标：aboutView（））{ 文本（“关于”）。此编码将删除预期的表达式错误

iOS 14.0 Xcode 12.0.1加伦

struct ContentView: View {

    @State private var activateAbout = false
    
    var body: some View {
        
        NavigationView {
            VStack {
                
                   ... menu navigation links
            }
            .font(.title)
            .navigationBarTitle("blah blah blah", displayMode: .inline)
            .background(
                // hide programmatically activated link here !!
                NavigationLink(destination: aboutView(), isActive: $activateAbout) { EmptyView()
            )
                    .navigationBarItems(trailing: Button( action: {
                    // not add - only activate it here, otherwise it will not work
                        self.activateAbout = true
                    }) {
                        Text("About")
                    }
                }           
            }
            
            .onAppear(perform: loadCurrencies)
        }
    }
}

以下是aboutView>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

struct aboutView: View {
    
    @EnvironmentObject var userData: UserData
    @State private var useHomeCur: Bool
    
    var body: some View {

        NavigationView {
        Form {
                VStack (alignment: .center) {
                    Text("blah blah blah")
                    Text("blah blah blah")
                }.font(.body)
            
                Toggle(isOn: $useHomeCur) {
                    Text("Use this fancy feature")
               }.padding()

           NavigationLink(destination: docView()) {
                Text("Documentation")
            }
        }.navigationBarTitle("About", displayMode: .inline)
  
        }
    }
}

---

状态变量用于内部视图，因此应该在内部初始化（最好是将其私有化）

内部初始化的变体

struct aboutView:View{
@环境对象变量userData:userData
@国家私有变量useHomeCur:Bool=false//
struct aboutView: View {
    
    @EnvironmentObject var userData: UserData
    @State private var useHomeCur: Bool = false    // << here !!

struct aboutView: View {
    
    @EnvironmentObject var userData: UserData
    @State private var useHomeCur: Bool

    init(useHomeCur: Bool = false) {
       _useHomeCur = State(initialValue: useHomeCur)    // << here !!
    }
    ...