Agentic Coding in Xcode with Gemini CLI
Learn how to use Gemini CLI for agentic coding in Xcode 26.3 via the MCP bridge. This post covers setup, configuration, and a practical example of building an emoji physics playground.
Peter Friese
Firebase, Swift, SwiftUI, and Combine articles and tips by Peter Friese
Latest posts
Turn Your Photos Into Miniature Magic with Nano Banana
Learn how to use Nano Banana (Gemini 2.5 Flash Image Generation) and Firebase AI Logic to add powerful text-to-image and image-to-image generation capabilities to your iOS applications with just a few lines of Swift code.
Reverse-Engineering Xcode's Coding Intelligence prompt
Ever wondered how Xcode's Coding Intelligence prompt works? In this blog post, we'll take a deep dive into the prompt's inner workings and explore how it helps developers write code more efficiently.
Extracting structured data from PDFs using Gemini 2.0 and Genkit
Learn how to use Gemini 2.0 and Genkit for Node.js to efficiently extract structured data from PDFs
Understanding SwiftUI Preferences
Learn how to use SwiftUI Preferences to establish efficient parent-child view communication. This comprehensive guide explains what Preferences are, how they differ from other state management approaches, and demonstrates practical implementation with a form validation example. Includes Swift 6 compatibility tips and best practices for modern iOS development.
Creating a reusable action menu component in SwiftUI
Learn how to create a reusable SwiftUI action menu from scratch. This tutorial shows how to transform a basic sheet-based menu into a polished, reusable component using view builders, custom modifiers, and SwiftUI styles. Includes complete code examples and best practices.
Creating custom SF Symbols using the SF Symbols app
Learn how to create custom SF Symbols without any design skills, using the SF Symbols app.
Improve your app's UX with SwiftUI's task view modifier
Learn how to implement a DelayTaskViewModifier
SwiftUI Hero Animations with NavigationTransition
Learn how to replicate the App Store hero animation with SwiftUI's new NavigationTransition
Styling SwiftUI Views
Learn how to create custom styles for built-in SwiftUI views
Previewing Stateful SwiftUI Views
Learn how to create interactive previews for SwiftUI views that make use of @Binding
Asynchronous programming with SwiftUI and Combine
Calling asynchronous code from Combine
Building a Custom Combine Operator for Exponential Backoff
Learn how to build custom Combine operators, and make your Combine pipelines easier to read and more reusable.
Error Handling with Combine and SwiftUI
Learn how you can use Combine to improve error handling in your SwiftUI apps
Calling asynchronous Firebase APIs from Swift
Learn the correct way to call Firebase's APIs from Swift
Optimise your networking layer with Combine
Learn how to use Combine to make your networking layer up to 10x more efficient!
Networking with Combine and SwiftUI
Learn how to use Combine to access remote APIs and display the results in SwiftUI
Confirmation Dialogs in SwiftUI
Create a custom view modifier for handling confirmation dialogs in SwiftUI
Using View Modifiers to Display Empty State
Create a custom view modifier to manage empty state in your SwiftUI app
Managing Focus in SwiftUI List Views
How to manage focus in SwiftUI List Views
Swipe Actions in SwiftUI 3
Easily add Swipe Actions to your UIs using SwiftUI
Styling List Views
Learn how to style SwiftUI List views
Building Dynamic Lists in SwiftUI
SwiftUI's List View is a very powerful UI component. Learn how to use it to asynchronously fetch data, and add features like pull-to-refresh, searching, and make your list items editable.
Building Static Lists in SwiftUI
List views are a staple of iOS UIs. Learn how SwiftUI makes implementing them super easy.
Cooperative Task Cancellation
Using async/await in SwiftUI apps
Getting Started with async/await in SwiftUI
Using async/await in SwiftUI apps
SwiftUI List Bindings
How to write asynchronous code without deeply nested callbacks
Mapping Firestore Data in Swift
Learn everything about how to map Firestore documents to Swift and back
Using async/await in SwiftUI
How to write asynchronous code without deeply nested callbacks
Firebase Authentication: Migrating User Data
Learn how to migrate data using Cloud Firestore
Firebase and the new SwiftUI 2 Application Life Cycle
Learn how to initialise Firebase in your SwiftUI 2 application
The Ultimate Guide to the SwiftUI 2 Application Life Cycle
Everything you need to know about the new application life cycle in SwiftUI 2
Updating Data in Firestore from a SwiftUI app
Learn how to update data in Firestore from a SwiftUI Application
Fetching API Keys from Property List Files
How to keep your apps secure
Adding Data to Firestore from a SwiftUI app
Learn how to write data to Firestore from a SwiftUI Application
SwiftUI: Mapping Firestore Documents using Swift Codable
Learn how to easily map Firestore data in Swift
SwiftUI: Fetching Data from Firestore in Real Time
Learn how to fetch data from Firestore in a SwiftUI Application
Sign in with Apple using SwiftUI and Firebase
Learn how to add Sign in with Apple to a to-do list application built using SwiftUI and Firebase
Connecting SwiftUI and Cloud Firestore
Learn how to use SwiftUI and Firebase to build a real-world app
SwiftUI, Combine, and Firebase
Learn how to use SwiftUI and Firebase to build a real-world app
Essential Xcode Shortcuts for More Efficient Coding
Learn these essential shortcuts to become a more productive developer
SwiftUI + Combine = ❤️
Learn how SwiftUI and Combine will help you build better apps and have more fun along the way.