NavigationView and NavigationLink on button click in SwiftUI?

Simplest and most effective solution is :

NavigationLink(destination:ScoresTableView()) {
                    Text("Scores")
                }.navigationBarHidden(true)
                    .frame(width: 90, height: 45, alignment: .center)
                    .foregroundColor(.white)
                    .background(LinearGradient(gradient: Gradient(colors: [Color.red, Color.blue]), startPoint: .leading, endPoint: .trailing))
                    .cornerRadius(10)
                    .contentShape(Rectangle())
                    .padding(EdgeInsets(top: 16, leading: UIScreen.main.bounds.size.width - 110 , bottom: 16, trailing: 20))

ScoresTableView is the destination view.

The accepted answer uses NavigationLink(destination:tag:selection:) which is correct.

However, for a simple view with just one NavigationLink you can use a simpler variant: NavigationLink(destination:isActive:)

---

Usage #1

NavigationLink is activated by a standard Button:

struct ContentView: View {
    @State var isLinkActive = false

    var body: some View {
        NavigationView {
            VStack(alignment: .leading) {
                ...
                NavigationLink(destination: Text("OtherView"), isActive: $isLinkActive) {
                    Button(action: {
                        self.isLinkActive = true
                    }) {
                        Text("Login")
                    }
                }
            }
            .navigationBarTitle(Text("Login"))
        }
    }
}

---

Usage #2

NavigationLink is hidden and activated by a standard Button:

struct ContentView: View {
    @State var isLinkActive = false

    var body: some View {
        NavigationView {
            VStack(alignment: .leading) {
                ...
                Button(action: {
                    self.isLinkActive = true
                }) {
                    Text("Login")
                }
            }
            .navigationBarTitle(Text("Login"))
            .background(
                NavigationLink(destination: Text("OtherView"), isActive: $isLinkActive) {
                    EmptyView()
                }
                .hidden()
            )
        }
    }
}

---

Usage #3

NavigationLink is hidden and activated programmatically:

struct ContentView: View {
    @State var isLinkActive = false

    var body: some View {
        NavigationView {
            VStack(alignment: .leading) {
                ...
            }
            .navigationBarTitle(Text("Login"))
            .background(
                NavigationLink(destination: Text("OtherView"), isActive: $isLinkActive) {
                    EmptyView()
                }
                .hidden()
            )
        }
        .onAppear {
            self.isLinkActive = true
        }
    }
}

---

_{Here is a GitHub repository with different SwiftUI extensions that makes navigation easier.}

To fix your issue you need to bind and manage tag with NavigationLink, So create one state inside you view as follow, just add above body.

@State var selection: Int? = nil

Then update your button code as follow to add NavigationLink

NavigationLink(destination: Text("Test"), tag: 1, selection: $selection) {
    Button(action: {
        print("login tapped")
        self.selection = 1
    }) {
        HStack {
            Spacer()
            Text("Login").foregroundColor(Color.white).bold()
            Spacer()
        }
    }
    .accentColor(Color.black)
    .padding()
    .background(Color(UIColor.darkGray))
    .cornerRadius(4.0)
    .padding(Edge.Set.vertical, 20)
}

Meaning is, when selection and NavigationLink tag value will match then navigation will be occurs.

I hope this will help you.

Another approach:

SceneDelegate

if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)
            window.rootViewController = UIHostingController(rootView: BaseView().environmentObject(ViewRouter()))
            self.window = window
            window.makeKeyAndVisible()
        }

BaseView

import SwiftUI

struct BaseView : View {

    @EnvironmentObject var viewRouter: ViewRouter

    var body: some View {
        VStack {
            if viewRouter.currentPage == "view1" {
                FirstView()
            } else if viewRouter.currentPage == "view2" {
                SecondView()
                    .transition(.scale)
            }
        }
    }
}

#if DEBUG
struct MotherView_Previews : PreviewProvider {
    static var previews: some View {
        BaseView().environmentObject(ViewRouter())
    }
}
#endif

ViewRouter

import Foundation
import Combine
import SwiftUI

class ViewRouter: ObservableObject {

    let objectWillChange = PassthroughSubject<ViewRouter,Never>()

    var currentPage: String = "view1" {
        didSet {
            withAnimation() {
                objectWillChange.send(self)
            }
        }
    }
}

FirstView

import SwiftUI

struct FirstView : View {

    @EnvironmentObject var viewRouter: ViewRouter

    var body: some View {
        VStack {
            Button(action: {self.viewRouter.currentPage = "view2"}) {
                NextButtonContent()
            }
        }
    }
}

#if DEBUG
struct FirstView_Previews : PreviewProvider {
    static var previews: some View {
        FirstView().environmentObject(ViewRouter())
    }
}
#endif

struct NextButtonContent : View {
    var body: some View {
        return Text("Next")
            .foregroundColor(.white)
            .frame(width: 200, height: 50)
            .background(Color.blue)
            .cornerRadius(15)
            .padding(.top, 50)
    }
}

SecondView

import SwiftUI

struct SecondView : View {

    @EnvironmentObject var viewRouter: ViewRouter

    var body: some View {
        VStack {
            Spacer(minLength: 50.0)
            Button(action: {self.viewRouter.currentPage = "view1"}) {
                BackButtonContent()
            }
        }
    }
}

#if DEBUG
struct SecondView_Previews : PreviewProvider {
    static var previews: some View {
        SecondView().environmentObject(ViewRouter())
    }
}
#endif

struct BackButtonContent : View {
    var body: some View {
        return Text("Back")
            .foregroundColor(.white)
            .frame(width: 200, height: 50)
            .background(Color.blue)
            .cornerRadius(15)
            .padding(.top, 50)
    }
}

Hope this helps!