Mastering Swift 6 and SwiftUI in 2025: A Hands-On Tutorial

Swift 6 is here, and it brings with it some powerful new tools for modern app development—especially when paired with SwiftUI. Whether you're an iOS veteran or a curious newcomer, this tutorial will walk you through building a fully functional SwiftUI app using the latest Swift 6 features.

🧰 What You’ll Learn

New Swift 6 syntax improvements
Advanced SwiftUI techniques
Structured concurrency best practices
Building a small app with real-time updates

🚀 Prerequisites

Xcode 17 or later
Basic knowledge of Swift and SwiftUI
A Mac running macOS Sonoma or later

1. Setting Up Your Project

Open Xcode and create a new SwiftUI App project. Make sure you're targeting iOS 18 and using Swift 6 as your language version.

swift
import SwiftUI

@main
struct Swift6DemoApp: App {
var body: some Scene {
WindowGroup {
ContentView()
}
}
}

2. Exploring Swift 6 Enhancements

One major upgrade in Swift 6 is improved macro support. Let's define a custom macro for logging:

swift
@freestanding(expression)
macro Log(_ message: String) = #externalMacro(module: "LoggerMacros", type: "LogMacro")

// Usage
let name = "Dev.to"

Log("Hello from (name)!")

Macros allow you to reduce boilerplate and keep your codebase DRY.

3. Async Sequences with Structured Concurrency

Swift 6 improves structured concurrency, making it easier to handle real-time data:

swift
import Foundation

func streamNumbers() -> AsyncStream {
AsyncStream { continuation in
for i in 1...5 {
continuation.yield(i)
try? await Task.sleep(nanoseconds: 1_000_000_000)
}
continuation.finish()
}
}

Use this stream in your SwiftUI view to display dynamic content.

4. Building a Real-Time SwiftUI View

Let’s use the above stream in a SwiftUI view:

swift
struct ContentView: View {
@State private var numbers: [Int] = []

var body: some View {
List(numbers, id: \ .self) { number in
Text("Number: (number)")
}
.task {
for await number in streamNumbers() {
numbers.append(number)
}
}
}
}

Notice how .task is used to bind asynchronous logic directly within the view.

5. New NavigationStack and Transitions

SwiftUI in 2025 improves navigation with NavigationStack and smoother transitions.

swift
NavigationStack {
NavigationLink("Go to Detail", destination: DetailView())
}

6. Bonus: Custom View Transitions

Create a subtle slide-in animation with the new .transition API:

swift
.transition(.move(edge: .trailing).combined(with: .opacity))

Use this in your if statements to animate view appearance.

🎯 Wrapping Up

Swift 6 and SwiftUI together empower developers to build faster, safer, and more expressive apps. With new macro support, enhanced concurrency, and declarative UI tools, you’re well-equipped to tackle modern app development in 2025.

Feel free to fork this example and play around. Questions or ideas? Drop them in the comments below!

📚 Next Steps