How can I add a navigation split view

To add a navigation split view in SwiftUI, you can use the existing NavigationSplitView APIs. Here are some steps and tips based on the content from WWDC:

Using NavigationSplitView:
- You can build a navigation split view using the NavigationSplitView API. This is particularly useful for creating sidebars that help users navigate through your app's content.
Adopting Sidebar Appearance:
- If you are currently using a tab bar, you can easily switch to a sidebar appearance by setting the tab view style to sidebarAdaptable. This can be done with just one line of code:
```
.tabViewStyle(.sidebarAdaptable)
```
- This modifier will transform your tab bar into a sidebar, which is especially useful on iPadOS and tvOS.
Customization and Flexibility:
- The sidebar in iOS 18 and iPadOS 18 has become more flexible, allowing users to switch between a tab bar and a sidebar representation. This can be particularly useful for apps with a lot of content, as it allows for customization such as reordering and removing tabs programmatically.

Example Code:

Here is a simple example of how you might set up a navigation split view in SwiftUI:

import SwiftUI

struct ContentView: View {
    var body: some View {
        NavigationSplitView {
            List {
                NavigationLink("Item 1", destination: Text("Detail 1"))
                NavigationLink("Item 2", destination: Text("Detail 2"))
            }
            .navigationTitle("Sidebar")
        } detail: {
            Text("Select an item")
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

For more detailed information, you can refer to the session Elevate your tab and sidebar experience in iPadOS (06:41).

Relevant Sessions

These sessions provide comprehensive insights into using and customizing navigation split views and sidebars in SwiftUI.