SwiftLee

SwiftUI performance problems often come down to views that redraw too often or take too long to run their body.

Agentic iOS development changes a lot once your coding agent can see and measure the app it’s building.

I’m super excited to introduce you to RocketTrace: a Mac app that analyzes your Xcode Instruments recordings and turns them into ranked findings that your AI agent can act on.

You can reduce token usage in Claude Code, Codex, and Cursor by guarding what your agent reads, not what it writes.

As soon as the iPhone Duo got announced, we were all waiting for an iPhone Duo Simulator inside Xcode.

A SwiftUI Agent Skill that helps you build better views or refactor existing ones.

App development is changing, and the iOS Simulator is too, as it starts to appear in Cursor, Claude Code, and Codex in different ways.

MVVM in SwiftUI separates a view’s presentation from the state and actions behind it.

@StateObject and @ObservedObject both connect an ObservableObject to a SwiftUI view.

Swift Testing is the modern framework for writing tests in Swift, built around expressive macros like @Test, #expect, and #require.

Sendable is a protocol in Swift that indicates a type is safe to share across concurrency domains like actors, tasks, and threads.

@MainActor is a global actor that performs its tasks on the main thread.

Xcode disk space can grow rapidly without you noticing.

Testing iOS Time Zones is a typical validation path that’s difficult without actually traveling yourself.

A user diagnostics report that helps you solve bugs and improve user support at the same time.

Although the defer keyword was already introduced in Swift 2.0, it’s still quite uncommon to use it in projects.