swift - 自定义 UITabBarController 内部的导航视图格式

Question

我创建了一个自定义的 UITabBarController 来避免 SwiftUI 的标签栏的一些不足。在这里查看更多。这是我实现它的地方：

import SwiftUI

struct HomeView: View {

    @EnvironmentObject var appState: AppState

    var body: some View {


            UITabBarWrapper([
                TabBarElement(tabBarElementItem:
                    TabBarElementItem(title: "Learn", systemImageName: "book")) {
                        NewsView()
                },


                TabBarElement(tabBarElementItem:
                    TabBarElementItem(title: "Matches", systemImageName: "heart")) {

                        MatchesTab().environmentObject(AppState())

                },

                TabBarElement(tabBarElementItem:
                    TabBarElementItem(title: "Account", systemImageName: "person")) {
                        ProfileView()
                }


            ])
            .frame(maxHeight: .infinity)
            .edgesIgnoringSafeArea(.top)
    }
}

这MatchesTab()是一个NavigationView：

import SwiftUI

struct MatchesTab: View {

    @EnvironmentObject var appState: AppState

    @State private var showingCandidate = false

    var body: some View {
        NavigationView {
            if self.appState.hasTakenQuiz {
                MatchesTabDefaultView()
                    .transition(.opacity)
                    .animation(.default)

            } else {
                SplashView()

            }
        }
    }
}

由于某种原因，这个灰色空间出现在嵌入的下面MatchesTab：