A view that displays a root view and enables you to present additional views over the root view.

NavigationStack | Apple Developer Documentation

A view that displays a root view and enables you to present additional views over the root view.

https://developer.apple.com/documentation/swiftui/navigationstack

NavigationLink(destination: {
                Text("Screen 2")
            }, label: {
                Text("Click me")
            })
            .navigationTitle("Hello, World")

NavigationLink , It only move up and back on stack only

When it’s under NavigationStack, it can moves up and down freely.

struct MySecondScreen: View {
    
    let value: Int
    
    init(value: Int) {
        self.value = value
        print("INIT SCREEN: \(value)")
    }
    
    var body: some View {
        
        Text("Screen \(value)")
    }
}

Text will show screen # and when the view is initialized, it will print the which screen # got called

NavigationSplitView {
    ScrollView {
        VStack(spacing: 20) {
            ForEach(0..<10) { x in
                NavigationLink(destination: MySecondScreen(value: x)) {
                    Text("Click me")
                }
            }
        }
        .navigationTitle("Hello, World")
    }
} detail: {
    Model3D(named: "Scene", bundle: realityKitContentBundle)
        .padding(.bottom, 50)
}

This is a Swift code snippet for a SwiftUI application. It creates a split view navigation interface. The primary view contains a scrollable VStack with 10 navigation links, each leading to 'MySecondScreen' and passing a different value from 0 to 9.

The secondary view, or 'detail' view, displays a 3D model named 'Scene' from a RealityKit content bundle, padded at the bottom.

It loads all the screen on the background, if the number is large, it will slow down the app

NavigationSplitView {
    ScrollView {
        VStack(spacing: 20) {
            ForEach(0..<10) { x in
                NavigationLink(destination: MySecondScreen(value: x)) {
                    Text("Click me")
                }
            }
        }
        .navigationTitle("Hello, World")
    }
} detail: {
    Model3D(named: "Scene", bundle: realityKitContentBundle)
        .padding(.bottom, 50)
}

NavigationSplitView {
    ScrollView {
        VStack(spacing: 20) {
            ForEach(0..<10) { x in
                NavigationLink(value: x){
                    Text("Click me: \\(x)")
                }
            }
            .navigationDestination(for: Int.self) { value in
                MySecondScreen(value: value)
            }
            .navigationTitle("Hello, World")
        }
    }
} detail: {
    Model3D(named: "Scene", bundle: realityKitContentBundle)
        .padding(.bottom, 50)
}

The right one with .navigationDestination is faster and better to use because it creates the destination view (MySecondScreen in this case) only when it's needed (i.e., when the associated NavigationLink is clicked). This is more efficient, especially when dealing with a large number of views or complex views that can slow down the application if all are initialized at once. The left one, without .navigationDestination, initializes all destination views immediately, which can lead to performance issues.

The SwiftUI .navigationDestination(for:) modifier is used to create the destination view only when the associated NavigationLink is clicked. This modifier takes a closure as an argument. This closure is a function that creates the destination view, but it's not called until the NavigationLink is clicked. This way, not all destination views are created upfront, which saves memory and processing power, and can prevent performance issues in your app.

@State private car stackPath: [String] = []

NavigationStack(path: $stackPath){...}

It will only allow the. destination with the string value

Button("Super Segue") {
    stackPath.append(contentsOf: [
        "Coconut", "Melon", "Mango"
    ])
}

When the "Super Segue" button is clicked, the strings "Coconut", "Melon", and "Mango" are added to the stackPath array. This will cause the NavigationStack to navigate to these views in the order that they are added.

So, you will first see the "Coconut" view, then if you navigate forward, you'll see the "Melon" view, and finally the "Mango" view.

If you are in the "Mango" view and click the back button, you will navigate back to the "Melon" view since the NavigationStack maintains a stack-like structure, where the most recently added view is the one you see, and pressing back removes it from the stack and shows the previously added view.

Today, I studied NavigationStack in SwiftUI. It enables navigation between different views in the app. This is achieved through the use of NavigationLink. The .navigationDestination(for:) modifier further enhances performance by only creating destination views when necessary. This is particularly beneficial for managing a multitude of complex views.

Today, I examined SwiftUI's NavigationStack. It uses NavigationLink for view navigation. The .navigationDestination(for:) modifier boosts efficiency by creating views only when needed, aiding in handling numerous complex views.

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