Give your simulator superpowers

RocketSim: An Essential Developer Tool
as recommended by Apple

Issue 265
Apr 01, 2025

This week's SwiftLee Weekly covers:

  • What's new in Xcode 16.3 and Swift 6.1?
  • Static vs. Dynamic dispatching
  • New: RocketSim AI

Enjoy this week's SwiftLee Weekly!

THIS WEEK'S BLOG POST

​SwiftUI Grid, LazyVGrid, LazyHGrid Explained with Code Examples​

SwiftUI offers a Grid view, but it also comes with a LazyVGrid and LazyHGrid. Do you know when to use which?

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NEW SPEAKING GIG

Almere Tech Meetup

On Thursday, April 17th, I'll be giving my "From Side Project to Going Indie" talk at De Nieuwe Bibliotheek in Almere. This one is for those in the Netherlands—I'd love to see you there! You can sign up here.

CURATED FROM THE COMMUNITY

​Swiftdata Architecture Patterns And Practices​

How do you approach architecture in your code? This is even more a question when working with data storage frameworks like SwiftData. This article guides you.
​azamsharp.com​

​Swift by Sundell is back!​

This is excellent news for the community! John has published so many great articles in the past and shares his journey towards this blog relaunch. As a frequent writer, I truly recognize the challenges of running a successful blog. His first article directly proves why it’s great to have him back!
​swiftbysundell.com​

​Method dispatch mechanisms in Swift: static and dynamic dispatch​

Swift these days is so fast, we nearly feel the need to think about performance. Do you know the difference between static and dynamic dispatching? It used to be much more important back in the days of slower devices. I loved reading this article!
​nilcoalescing.com​

​SwiftUI Environment - Concepts and Practice​

While working with SwiftUI’s environment might be common sense, dealing with Swift 6 and using the transformEnvironment modifier could be new!
​fatbobman.com​

​How to turn a SwiftUI color into a gradient​

Short and simple, but I had no idea this property existed!
​swiftwithvincent.com​

CODE SNIPPET OF THE WEEK

RocketSim AI: Prompt for Design Improvements

I'm beyond excited to introduce you to RocketSim AI.

Ever looked at your iOS app and wondered, “How can this screen look better?”

With RocketSim AI, you can now get actionable UI improvement suggestions — just by prompting.

Check out the demo video and early access instructions on Twitter/X, LinkedIn, or Bluesky.

QUESTION OF THE WEEK

“
What's new in Xcode 16.3 and Swift 6.1?

Xcode 16.3 was released, and with it came Swift 6.1. Let's dive into the changes.

First, here's a list of all 11 proposals that went into Swift 6.1. It's a blessing to see our language getting improvements so frequently. There's currently a lot going on regarding improvements, and you can clearly see a path toward improved concurrency adoptability inspired by the vision document.

The Swift team published an official release article on their blog to guide you through a few highlights of the changes. I recommend looking into the release notes for Xcode 16.3.

These are my highlights of the latest Xcode release:

  • Predictive code completion improved
  • Swift Testing now includes Test Scoping Traits (See SWT-0007)
  • xcresulttool received many new commands

The latter might be the most surprising favorite for you, but it's an example of a potential new developer tool. I love reading through Xcode changelogs to find out new gems!

Meanwhile, Swift 6.2 is already in development. The Swift Evolution changes in this newsletter show that more improvements are expected soon.

Want to have your question answered next week? Ask your question via this form (anonymously) or reply to this email with your question.

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Thank you so much for your support, and until next Tuesday,

Antoine

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