TabBar

enum Item: Int, Tabbable {
    case first = 0
    case second
    case third
    
    var icon: String {
        switch self {
            case .first:  // Name of icon of first item.
            case .second: // Name of icon of second item.
            case .third:  // Name of icon of third item.
        }
    }
    
    var title: String {
        switch self {
            case .first:  // Title of first item.
            case .second: // Title of second item.
            case .third:  // Title of third item.
        }
    }
}

struct ContentView: View {
    @State private var selection: Item = .first
    @State private var visibility: TabBarVisibility = .visible

    var body: some View {
        TabBar(selection: $selection, visibility: $visibility) {
            Text("First")
                .tabItem(for: Item.first)
            
            Text("Second")
                .tabItem(for: Item.second)
            
            Text("Third")
                .tabItem(for: Item.third)
        }
        .tabBar(style: CustomTabBarStyle())
        .tabItem(style: CustomTabItemStyle())
    }
}