backbutton swiftui in swift

In SwiftUI, the NavigationView has a built-in navigation bar with a back button that automatically pops the current view when tapped. To add this behavior, you need to embed your view in a NavigationView and then use a NavigationLink to push the next view onto the navigation stack. Here's an example:

main.swift
struct ContentView: View {
    var body: some View {
        NavigationView {
            VStack {
                Text("Hello, SwiftUI!")
                    .padding()
                NavigationLink(destination: DetailView()) {
                    Text("Show Detail")
                }
            }
            .navigationBarTitle("My App")
        }
    }
}

struct DetailView: View {
    var body: some View {
        Text("Detail View")
            .padding()
            .navigationBarTitle("Detail")
    }
}
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This code creates a simple app with two views: ContentView and DetailView. ContentView is wrapped in a NavigationView and contains a NavigationLink that pushes DetailView when tapped. DetailView has a back button that pops itself when tapped.

If you need more control over the behavior of the back button (e.g. if you want to modify the text or add an action), you can use the navigationBarBackButtonHidden modifier to hide the default back button and then add a custom button with the behavior you want. Here's an example:

main.swift
struct ContentView: View {
    @Environment(\.presentationMode) var presentationMode
    
    var body: some View {
        NavigationView {
            VStack {
                Text("Hello, SwiftUI!")
                    .padding()
                Button(action: {
                    self.presentationMode.wrappedValue.dismiss()
                }) {
                    Text("Go Back")
                }
                .navigationBarBackButtonHidden(true)
            }
            .navigationBarTitle("My App")
        }
    }
}
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This code creates an app with a custom back button that just pops the current view when tapped. The presentationMode environment variable is used to dismiss the current view when the button is tapped. The navigationBarBackButtonHidden modifier is used to hide the default back button.