我正在尝试在SwiftUI中构建一个应用程序。我需要在点击中心选项卡中的按钮时呈现全屏视图，并在第二次单击时消除相同的视图。所需的视图应该在选项卡视图上方。
我的内容视图是：

struct ContentView: View {
@State var index = 0
@State private var isPresented = false

var body: some View {
    VStack(spacing: 0) {
        ZStack {
            Color.clear
            switch self.index {
            case 0:
                Home()
            case 1:
                Info()
            case 2:
                Services()
            case 3:
                Support()
            case 4:
                Notifications()
            default:
                Home()
            }
        }
        CustomTabs(index: $index)
    }
}

}
我的自定义选项卡视图是：

struct CustomTabs: View {
@Binding var index: Int
@State private var showServiceView = false
@State var rotation = 0.0
@State private var isPresented = false

var body: some View {
    HStack {
        //Home
            VStack {
                Image("home")
                Text("Home").font(.system(size: 12))
            }
            .padding(.leading, 20)
            .frame(width: 55, height: 90)
        
        Spacer(minLength: 0)
        
        //Information
        VStack {
                Image("info")
                Text("Information").font(.system(size: 12))
            }
                         
        Spacer(minLength: 0)
        
        //Services
            VStack {
                ZStack {
                    RoundedRectangle(cornerRadius: 45)
                        .fill(Color.clear)
                        .frame(width: 90, height: 80)
                    Image(self.isPresented ? "closeTab" : "bottombutton")
                }
                Text("Services").font(.system(size: 12))
            }
            .offset(y: -30)
            .onTapGesture {
                self.index = 2
                self.isPresented.toggle()
            }
        
        Spacer(minLength: 0)
        
        //Support
        VStack {
                Image("support")
                Text("Support").font(.system(size: 12))
            }
        
        Spacer(minLength: 0)
        
        // Notifications
        VStack {
                Image(self.index == 4 ? "alertsSelected" : "tab_alert")
                Text("Alerts").font(.system(size: 12))
            }
    }
    .frame( height: 70)
    .background(Color.white)
}

}
我试着用

.sheet(isPresented: $isPresented, content: {
                //View2()
            })

以及

.fullScreenCover(isPresented: $isPresented, content: {
            //View2()
        })

这是在标签视图上提供底部工作表

我需要一张底片