Question

我创建了一个自定义UITabBarController来避免SwiftUI标签栏的某些不足。查看更多here。这是我实现的地方：

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)
    }
}

MatchesTab()是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，此灰色空间出现在嵌入的MatchesTab下：