Peter Friese

Peter Friese

@peterfriese.dev

Developer Advocate on the Firebase team @ Google YouTube: https://www.youtube.com/@PeterFriese Blog: https://peterfriese.dev

1.6K followers1.1K following1K posts

Peter Friese
@peterfriese.dev

Protecting communication between your iOS app and backend is critical, especially when preventing unauthorized AI API calls. Artem Mirzabekian explains how Apple App Attest works under the hood: go.peterfriese.dev/code-apple-...

livsycode.comApple App Attest in iOS Development → Livsy CodeGreetings, traveler! Apple App Attest lets your server verify that a request comes from a legitimate instance of your app running on Apple hardware. This matters when the server exposes something that should not be available to arbitrary clients. A modified copy of the app, a script that reproduces your API calls, or a client
Peter Friese
@peterfriese.dev

Being unsure is a natural property of fast decision models. Alejandro Martinez explains how this uncertainty is actually useful for triggering human-in-the-loop decisions: go.peterfriese.dev/ai-using-je...

alejandromp.comUsing Jev to Help a Human Decide | Alejandro M. P.Something we don’t speak enough about as we include more AI in our processes is the cost, not of the tokens, but of the classical compute we need. The more AI, the more PRs, the more CI we run. To combat that I have been building a custom system I call the merge gate. The gate watches the team’s pull requests and when one looks ready, the gate syncs it with the main branch, which triggers the real CI jobs. It picks the order so CI time stays under control, and then it merges the PR once everything is green. This fully automated process has kept the costs of our CI under control allowing us to increase the usage of AI in a responsible manner.
Peter Friese
@peterfriese.dev

📱 Not only Swift #107 is out! 🗞️ • Everything is Shared on iPhone Duo (@hmlongco.bsky.social) • More ambitious with models (Felix Rieseberg) • Calming down Claude (@mergesort.me) • SwiftUI around the fold (@natpanferova.bsky.social) peterfriese.dev/newsletter/...

peterfriese.devNot only Swift - Issue #107Michael Long on iPhone Duo and singletons in Swift dependency injection, Felix Rieseberg on being more ambitious with models, calming down Claude with REVIEW.md, App Attest, OSLog, and positioning SwiftUI views around the fold.
Peter Friese
@peterfriese.dev

Combining AsyncSequence with Async Algorithms (like debounce and map) can save a surprising amount of boilerplate. Featured in Not only Swift #106: go.peterfriese.dev/swift-itera...

peterfriese.devNot only Swift - Issue #106How native SwiftUI controls adopt Liquid Glass in iOS 26 without extra code. Plus: Cupertino.tech's Apple SDK timeline, Margaret Hamilton's pioneering legacy, SwiftFairy code review for AI agents, iterative data loading in Swift, and reviving dinner parties.
Peter Friese
@peterfriese.dev

When you have debug, staging, and prod builds side-by-side on your phone, you want to tell them apart at a glance. Mustafa Natur's Blueprint generates an Xcode-style blueprint icon with version and beta badges: go.peterfriese.dev/tools-bluep...

github.comGitHub - MustafaNatur/blueprint: Turn your app icon into a blueprint version, like Xcode's icon, for your debug buildsTurn your app icon into a blueprint version, like Xcode's icon, for your debug builds - MustafaNatur/blueprint
Peter Friese
@peterfriese.dev

I wish every coding agent read this line from @sarunw.com: "You don't need to add glassEffect() or change the existing code to see the difference." Sarun compared native SwiftUI controls on iOS 17.5 and iOS 26 side-by-side. Standard controls pick up the new look automatically!

Peter Friese
@peterfriese.dev

The tricky part was that the status dashboard stayed green because requests returned 200 OK. I wrote about this and the subtle traps in client/backend contracts in Not only Swift #106: go.peterfriese.dev/firebase-an...

peterfriese.devNot only Swift - Issue #106How native SwiftUI controls adopt Liquid Glass in iOS 26 without extra code. Plus: Cupertino.tech's Apple SDK timeline, Margaret Hamilton's pioneering legacy, SwiftFairy code review for AI agents, iterative data loading in Swift, and reviving dinner parties.
Peter Friese
@peterfriese.dev

I've been experimenting with MCP servers for coding agents a lot lately. You can read more about how SwiftFairy fits into that in Not only Swift #106: go.peterfriese.dev/ai-swiftfai...

peterfriese.devNot only Swift - Issue #106How native SwiftUI controls adopt Liquid Glass in iOS 26 without extra code. Plus: Cupertino.tech's Apple SDK timeline, Margaret Hamilton's pioneering legacy, SwiftFairy code review for AI agents, iterative data loading in Swift, and reviving dinner parties.
Peter Friese
@peterfriese.dev

Here is your updated list of iOS, Swift, and AI conferences for 2026! I'll be at DevFest Hamburg this week - if you see me there, come say hi (I might have some Firebase swag with me 🧦 🔥): go.peterfriese.dev/conferences...

peterfriese.devNot only Swift - Issue #100Celebrating 100 issues of Not only Swift! Featuring FlowDeck Studio, agentic iOS delivery pipelines, Sendable closures, adaptive SwiftUI toolbars, WhatCable USB-C diagnostics, and 2026/2027 iOS conferences.
Peter Friese
@peterfriese.dev

📱 Not only Swift #106 is out! 🗞️ I built a Keynote replacement with coding agents (Magic Move + Markdown + live iPhone mirroring!). Plus: • Native SwiftUI in iOS 26 (Sarunw) • Cupertino.tech (@alemohamad.com) • SwiftFairy (@hishnash.bsky.social) peterfriese.dev/newsletter/...

peterfriese.devNot only Swift - Issue #106How native SwiftUI controls adopt Liquid Glass in iOS 26 without extra code. Plus: Cupertino.tech's Apple SDK timeline, Margaret Hamilton's pioneering legacy, SwiftFairy code review for AI agents, iterative data loading in Swift, and reviving dinner parties.
Peter Friese
@peterfriese.dev

I had Gemini 4 analyse all my Keynote presentations - almost 300 .key files (each with several hundred slides - I heavily rely on Magic Move) in less than 20 minutes (while I was on a train, no less). Here is what it found:

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Peter Friese
@peterfriese.dev

I had Gemini 4 analyse all my Keynote presentations - almost 300 .key files (each with several hundred slides - I heavily rely on Magic Move) in less than 20 minutes (while I was on a train, no less). Here is what it found:

Peter Friese
@peterfriese.dev

I haven't seen a single AI coding agent that has good taste for building good-looking and functional UIs - unless you tech them with a skill.

Peter Friese
@peterfriese.dev

Analyzing images is a great use case for AI in Swift. @mecid.bsky.social shows how Apple's Foundation Models framework handles multimodal input cleanly using Swift result builders, on-device and in the cloud. go.peterfriese.dev/swift-found...

swiftwithmajid.comBuilding AI features using Foundation Models. Multimodal input.One of the most eagerly anticipated additions to Foundation Models was the ability to input images. I was almost certain that we would receive this feature during this WWDC, and fortunately, we did. This week, we will learn how to utilize the multimodal input capability in Foundation Models.
Peter Friese
@peterfriese.dev

I end all of my newsletter intros with "hit reply - I read every email". And I actually mean it! This week, Stephan emailed me, looking for the print detail of Jace's physical copy of The Swift Programming Language book I mentioned in issue 94 (peterfriese.dev/newsletter/...).

peterfriese.devNot only Swift - Issue #94Someone printed a physical copy of the Swift Programming Language book, and it looks fantastic! Plus: Explore the rise of agentic coding with Pi and OpenClaw, and dive into Swift-based vector databases for on-device RAG.
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Peter Friese
@peterfriese.dev

I end all of my newsletter intros with "hit reply - I read every email". And I actually mean it! This week, Stephan emailed me, looking for the print detail of Jace's physical copy of The Swift Programming Language book I mentioned in issue 94 (peterfriese.dev/newsletter/...).

peterfriese.devNot only Swift - Issue #94Someone printed a physical copy of the Swift Programming Language book, and it looks fantastic! Plus: Explore the rise of agentic coding with Pi and OpenClaw, and dive into Swift-based vector databases for on-device RAG.
Peter Friese
@peterfriese.dev

This conversation led to two great things 👇 1) Stephan shared a glimpse of a 300 page book on Swift generative art he's printing for his vacation (mind-blowing work).

Peter Friese
@peterfriese.dev

Developers hate adding dependencies to their code bases. So, instead of adding a UI library, why not copy paste highly polished components to your app? This concept has been popularised by ShadCN, and SwiftPieces follows the same concept.

Peter Friese reposted

Peter Friese
@peterfriese.dev

Ok, Swift fam. A Swift SDK for GCP is a *great* start, but we (also) need an Firebase SDK for the server side. Can we bump the votes for this up to get it close to the votes for KMP support? Cast your vote (link in the first reply)

Swift Language@swift.org

Google: “[Swift] has matured into a viable systems and cloud language, pairing Rust-like data-race safety with predictable, reference-counted performance.” Announcing their Swift-based cloud SDK for backend services: cloud.google.com/blog/topics/...

cloud.google.comIntroducing the Server Side Cloud Swift SDK | Google Cloud Blog