WWDC26 Swift Group Lab Q&A is probably the most valuable Swift Concurrency content from this year’s WWDC.

Lots of subtle details:

• Does Task {} actually leave MainActor?
• What does nonisolated mean in Swift 6.2 now?
• When should you use @concurrent?
• Is async code really running where you think it is?

… turns out the answer is increasingly: “not where you think.”

https://antongubarenko.substack.com/p/wwdc26-swift-group-lab-q-and-a
#Swift #concurrency

If you rushed to install the new Xcode after WWDC, started migrating code to ContentBuilder, and explored the new @State macro…

don’t forget to read TN3211.

It’s Apple’s guide to understanding why some perfectly valid SwiftUI code from last week suddenly isn’t so valid anymore.

https://developer.apple.com/documentation/technotes/tn3211-resolving-swiftui-source-incompatibilities-for-state-and-contentbuilder
#SwiftUI

Apple finally got around to adding this in iOS 27, and somehow I’m still genuinely excited about it. 😄

textSelection() now supports granular text selection. In iOS 26, applying it to a Text view only let you select the entire block. Now you can simply drag to select the exact part you want, just like in any native text view.

It took them until iOS 27… but I’ll happily take it.

https://x.com/natpanferova/status/2070781569044996429?s=46&t=YNy4qFziI3PFPTlrSCXpmA
#SwiftUI

If you’re using Tuist, it’s worth trying their new package resolution process - Swifterpm

Why did they build it?

• Better support for Git worktrees
• Faster parallel installs for AI coding agents
• A shared package store to avoid duplicate checkouts
• Faster dependency resolution and package materialization

The benchmark results look very promising.

The Tuist team is actively looking for feedback, so if it works well in your project, let them know!

#build #optimization #tuist

FYI Apple deprecated canOpenURL(_:) in iOS 27.

Instead of checking whether an app is installed, the new recommendation is to simply call open(_:completionHandler:) and handle failures.

There’s another change: apps linked against the iOS 27 SDK can now declare only 25 entries in LSApplicationQueriesSchemes (down from 50).

https://developer.apple.com/documentation/uikit/uiapplication/canopenurl(_:)
#iOS #privacy

If you’re migrating to Swift 6, this is a great short refresher on one of the most confusing concurrency changes.

It explains, with simple examples:
• how nonisolated behaves with Approachable Concurrency
• when execution stays on the caller’s executor
• and when @concurrent is actually needed.

These are easy details to forget, but they often come up in code reviews and technical interviews.
😉

https://nsvasilev.com/posts/approachable_concurrency/
#swift #concurrency

Apple introduced @ContentBuilder this year, and we’re already seeing developers push it beyond its original use case.

My Swift buddy Artem ran an interesting experiment using @ContentBuilder with non-View types. It’s a nice example of how the new builder can be used to create clean DSL-like APIs.

https://artemnovichkov.com/blog/using-swiftui-contentbuilder-with-non-view-types
#Swift #SwiftUI

Oh, alignmentGuide is one of my favorite SwiftUI APIs!

This article is a great example of how it can elegantly solve a layout problem without resorting to GeometryReader, offsets, or other workarounds.

If you’ve never really used alignmentGuide, this is definitely worth a read!

https://nilcoalescing.com/blog/AlignmentGuidesInSwiftUI
#SwiftUI

We’ve already seen some interesting experiments with the new @ContentBuilder, but if you’re curious about what actually changed under the hood, this is a great follow-up.

Fatbobman takes a closer look at how @ContentBuilder works, what changed compared to the old @ViewBuilder, and why building with non-View types is now possible in the first place.

https://fatbobman.com/en/posts/contentbuilder-explained/
#Swift #SwiftUI

Xcode 27 RC is out and App Store submissions are already open.

If your app still uses the old UIApplicationDelegate-based lifecycle without UIScene, now is the time to migrate. Apps built with the iOS 27 SDK won’t launch without the scene-based lifecycle.

FYI, UIScreen.main is deprecated too

https://developer.apple.com/documentation/Technotes/tn3187-Migrating-to-the-UIKit-scene-based-life-cycle

Just append .md to any Apple Developer Documentation URL to get the page as Markdown.

Looks like sosumi.ai can finally retire.

https://x.com/luka_bernardi/status/2098800800562819339?s=46&t=YNy4qFziI3PFPTlrSCXpmA
#llm #doc