如何隐藏 TabBar Swift UI？

Question

I have a TabBarView in the root view. In one of the parent views that's nested within the root view, I'd like the tab bar to hide when navigating from that parent view to the child view. Is there any func or command to handle that?

Something like this:

ContentView (with TabBarView) - > ExploreView (Called in TabBarView ) -> MessagesView (Child of ExploreVIew - Hide Tab bar)

My code can be seen below.

TabView{

    NavigationView{
        GeometryReader { geometry in
            ExploreView()
                .navigationBarTitle(Text(""), displayMode: .inline)
                .navigationBarItems(leading: Button(action: {
                }, label: {
                    HStack{
                        Image("cityOption")
                        Text("BER")
                        Image("arrowCities")
                    }.foregroundColor(Color("blackAndWhite"))
                        .font(.system(size: 12, weight: .semibold))
                }),trailing:
                    HStack{
                        Image("closttop")
                            .renderingMode(.template)
                            .padding(.trailing, 125)

                        NavigationLink(destination: MessagesView()
                            .navigationBarTitle(Text("Messages"), displayMode: .inline)
                            .navigationBarItems(trailing: Image("writemessage"))
                            .foregroundColor(Color("blackAndWhite"))
                        ){
                            Image("messages")
                        }
                    }.foregroundColor(Color("blackAndWhite"))
            )
        }
    }
    .tabItem{
        HStack{
            Image("clostNav").renderingMode(.template)
            Text("Explore")
                .font(.system(size: 16, weight: .semibold))
        }.foregroundColor(Color("blackAndWhite"))
    }
    SearchView().tabItem{
        Image("search").renderingMode(.template)
        Text("Search")
    }
    PostView().tabItem{
        HStack{
            Image("post").renderingMode(.template)
                .resizable().frame(width: 35, height: 35)
        }
    }
    OrdersView().tabItem{
        Image("orders").renderingMode(.template)
        Text("Orders")
    }
    ProfileView().tabItem{
        Image("profile").renderingMode(.template)
        Text("Profile")
    }
}

Appreciate any help! Thanks!

Answer 1

Create CustumPresentViewController.swift -

    import UIKit
    import SwiftUI

    struct ViewControllerHolder {
         weak var value: UIViewController?
    }

    struct ViewControllerKey: EnvironmentKey {
    static var defaultValue: ViewControllerHolder { return 
        ViewControllerHolder(value: 
        UIApplication.shared.windows.first?.rootViewController ) }
    }

    extension EnvironmentValues {
        var viewController: ViewControllerHolder {
            get { return self[ViewControllerKey.self] }
            set { self[ViewControllerKey.self] = newValue }
      }
    }

    extension UIViewController {
         func present<Content: View>(style: UIModalPresentationStyle = 
         .automatic, @ViewBuilder builder: () -> Content) {
             // Must instantiate HostingController with some sort of view...
             let toPresent = UIHostingController(rootView: 
              AnyView(EmptyView()))
             toPresent.modalPresentationStyle = style
             // ... but then we can reset rootView to include the environment
             toPresent.rootView = AnyView(
             builder()
            .environment(\.viewController, ViewControllerHolder(value: 
             toPresent))
    )
    self.present(toPresent, animated: true, completion: nil)
    }
}

Use this in required View -

@Environment(\.viewController) private var viewControllerHolder:  
ViewControllerHolder

private var viewController: UIViewController? {
    self.viewControllerHolder.value
}

var body: some View {
    NavigationView {
        ZStack {
            Text("Navigate")
        }.onTapGesture {
             self.viewController?.present(style: .fullScreen) {
                                    EditUserView()
             }
        }
    }
}

Answer 2

in a normal iphone environment the tabbar vanishes from itself if you are navigating....or are u running in another environment?

check this:

struct ContentView: View {

    @State var hideTabbar = false
    @State var navigate = false

    var body: some View {
        NavigationView {

            TabView {

                VStack {
                    NavigationLink(destination: Text("without tab")){
                      Text("aha")
                    }
                        .tabItem {
                            Text("b")
                    }
                }.tag(0)
                Text("Second View")
                    .tabItem {
                        GeometryReader { geometry in

                            Image(systemName: "2.circle")
                            //        Text("Second")
                            Text("\(geometry.size.height) - \(geometry.size.width)")

                        }
                }.tag(1)
            }
        }
    }//.isHidden(self.hideTabbar)
}

Answer 3

If you are using Navigation controller then simply call

self.parent?.navigationController?.pushViewController(yourViewController, animated: true)

Navigating to ChildVC this method will not include your TabBarView