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> State Management

// Master state management in SwiftUI. Learn about @State, @Binding, @EnvironmentObject, @Observable, Environment values, and data flow patterns.

35 Articles

01
April 21, 2026
Data Races Swift 6 Still Can't Catch
SwiftSwift-6Concurrency
Swift 6's data-race safety is real, but it has blind spots. Here are the places the compiler can't see, and...
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02
April 21, 2026
OSAllocatedUnfairLock in Swift: Usage and Examples
SwiftConcurrencyLocks
OSAllocatedUnfairLock is Swift's safe os_unfair_lock wrapper. Guard state with withLock, store the value...
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03
March 16, 2026
Prevent Your Mac from Sleeping While Claude Code Works
AIDevelopment-EnvironmentClaude-CodemacOS
Set up Claude Code to automatically keep your Mac awake during long tasks and let it sleep again when...
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04
March 14, 2026
Building Custom Container Views in SwiftUI with Subviews
SwiftUIiOS-18Custom-ViewsLayout
iOS 18 introduced public APIs for building custom container views that can decompose content into individual...
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05
March 13, 2026
Why Xcode Takes So Much Space (and How to Free 50GB+)
XcodeDevelopment-EnvironmentmacOS
Xcode eats storage through DerivedData, old simulators, device support files, and archives. Here's what each...
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06
March 3, 2026
Auto-Approve the Xcode MCP Prompt with Claude Code Hooks
XcodeAIClaude-CodeDevelopment-Environment
The Xcode MCP server connection prompt interrupts your flow every time you restart Claude Code or clear your...
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07
February 28, 2026
@Observable: Migrating from ObservableObject in SwiftUI
SwiftUIState-ManagementObservationProperty-Wrappers
Learn how to use Swift's @Observable macro introduced in iOS 17, understand its advantages over...
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08
February 27, 2026
@AppStorage vs UserDefaults vs SwiftData: Which to Use
SwiftUISwiftPersistenceUserDefaultsSwiftData
Use @AppStorage for small SwiftUI settings, UserDefaults outside views, and SwiftData for real models. Here...
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09
February 26, 2026
Getting Started with Swift Charts
SwiftUIChartsData-VisualizationiOS
Learn how to create beautiful, interactive charts in SwiftUI using Apple's Swift Charts framework, from...
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10
February 25, 2026
Expo on a Device over LAN: REACT_NATIVE_PACKAGER_HOSTNAME
React-NativeExpoDevelopment-EnvironmentmacOS
Set REACT_NATIVE_PACKAGER_HOSTNAME to your Mac's .local name so an Expo dev build on a physical device finds...
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11
February 24, 2026
How to Kill Port 8081 on Mac (Metro Already Running)
React-NativeExpoDevelopment-Environment
Kill port 8081 by finding the PID with lsof -i :8081 and running kill on it. Here's why an orphaned Metro...
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12
February 15, 2026
Preview Live Activities in SwiftUI with #Preview
SwiftUIWidgetKitLive-ActivitiesXcodePreviews
Preview Live Activity views right in Xcode without launching the app. Use the #Preview macro with content...
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13
February 14, 2026
What "Commit Changes" Means in Claude Code (Auto Commit)
AIDevelopment-EnvironmentClaude-Code
In Claude Code, commit changes means running git commit on the edits it made. Here's how to make it commit...
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14
February 12, 2026
Debugging SwiftUI Previews in Xcode
SwiftUIXcodePreviewsDebugging
When SwiftUI previews break, the error messages aren't always helpful. Here's how to debug them, clear...
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15
February 9, 2026
Vercel React Native Skills for AI Agents: Setup Guide
AIReact-NativeDevelopment-EnvironmentClaude-Code
Vercel's skills give AI coding agents reusable React Native instructions. Add them with npx skills add...
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16
February 7, 2026
SwiftUI vs UIKit: Which Should You Choose in 2026?
SwiftUIUIKitiOS-DevelopmentArchitecture
A practical guide to choosing between SwiftUI and UIKit in 2026, based on your project requirements, team...
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17
February 6, 2026
Key-Value Observing Deep Dive
Objective-CFoundationAdvanced
KVO lets you observe property changes without delegation or notifications. Here's how it works under the hood...
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18
February 6, 2026
NSTaggedPointerString: The Hidden String Optimization
Objective-CMemoryPerformance
Discover how the Objective-C runtime secretly stores small strings directly in pointer values, eliminating...
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19
February 6, 2026
Working with Optional ObservableObject in SwiftUI
SwiftUIState-ManagementObservableObject
Learn different approaches for handling optional ObservableObject instances in SwiftUI, from conditional...
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20
February 6, 2026
Preview Partially Generated Content: Foundation Models
SwiftUIFoundation-ModelsXcodePreviewsAI
When building UIs that stream AI-generated content using Apple's Foundation Models framework, testing...
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21
February 6, 2026
@State vs @Binding in SwiftUI: When to Use Each
SwiftUIState-ManagementData-FlowProperty-Wrappers
Understand the difference between @State and @Binding in SwiftUI, when to use each, and how they work...
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22
February 5, 2026
Configuring Claude Code Permissions for React Native
AIDevelopment-EnvironmentReact-NativeClaude-Code
React Native projects require running lots of shell commands. Here's how to configure Claude Code's...
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23
February 5, 2026
Failable Initializers for Optionals in SwiftUI Views
SwiftUISwiftOptionalsUI
Failable initializers offer a cleaner alternative to if-let statements when your SwiftUI views depend on...
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24
February 5, 2026
Resource Isolation in Swift Using Actors
SwiftConcurrencyActors
Actors provide compile-time safety for shared mutable state in Swift. Here's when to use them and how they...
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25
February 4, 2026
Xcode MCP Server: Build Xcode into Your AI Workflow
XcodeAIDevelopment-Environment
Xcode 26.3 ships with a built-in MCP server that exposes project structure, build actions, and test results...
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26
January 18, 2026
How to Change the Screenshot Location on Mac
macOSDevelopment-Environment
Change where Mac screenshots save with Cmd+Shift+5 then Options, or run defaults write...
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27
January 11, 2026
Auto-Switch Node Versions with nvm for React Native
macOSDevelopment-EnvironmentReact-Native
Avoid cryptic build failures by setting up nvm to automatically use the right Node version when you cd into a...
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28
December 30, 2025
Stop macOS Creating .DS_Store on Network & USB Drives
macOSConfigurationDevelopment-Environment
Stop macOS from writing .DS_Store files to network shares and USB drives with one Terminal command. Keep your...
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29
December 28, 2025
Detect When App Enters Background, Save State in SwiftUI
SwiftUILifecycleState-ManagementPersistence
Learn how to detect app lifecycle changes in SwiftUI, save state when your app enters the background, and...
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30
December 28, 2025
Implementing Undo/Redo in SwiftUI with UndoManager
SwiftUIUndoManagerState-Management
Learn how to implement undo/redo functionality in SwiftUI using UndoManager, including environment injection...
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31
December 4, 2025
Simulating Device Conditions in Xcode for Real-World Testing
XcodeTestingPerformanceDevelopment
Learn how to use Xcode's Device Conditions feature to simulate thermal state and network conditions to test...
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32
July 16, 2025
Access Environment Values in View Extensions
SwiftUIEnvironmentViewModifierExtensions
Learn how to access SwiftUI environment values in View extensions using ViewModifiers for clean, reusable...
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33
June 21, 2025
How to Read Environment Variables in Swift (ProcessInfo)
SwiftConfigurationEnvironmentDevelopment
Read an environment variable in Swift with ProcessInfo.processInfo.environment["KEY"]. Set values per scheme...
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34
June 21, 2025
Inspecting all SwiftUI Environment Values
SwiftUIEnvironmentDebuggingDevelopment
Learn how to dump all SwiftUI environment values for debugging purposes.
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35
December 16, 2024
Getting Current Disk Usage in Swift
SwiftStorageiOS
How to check available and total disk space on iOS devices using URL resource values.
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> State Management

Data Races Swift 6 Still Can't Catch

OSAllocatedUnfairLock in Swift: Usage and Examples

Prevent Your Mac from Sleeping While Claude Code Works

Building Custom Container Views in SwiftUI with Subviews

Why Xcode Takes So Much Space (and How to Free 50GB+)

Auto-Approve the Xcode MCP Prompt with Claude Code Hooks

@Observable: Migrating from ObservableObject in SwiftUI

@AppStorage vs UserDefaults vs SwiftData: Which to Use

Getting Started with Swift Charts

Expo on a Device over LAN: REACT_NATIVE_PACKAGER_HOSTNAME

How to Kill Port 8081 on Mac (Metro Already Running)

Preview Live Activities in SwiftUI with #Preview

What "Commit Changes" Means in Claude Code (Auto Commit)

Debugging SwiftUI Previews in Xcode

Vercel React Native Skills for AI Agents: Setup Guide

SwiftUI vs UIKit: Which Should You Choose in 2026?

Key-Value Observing Deep Dive

NSTaggedPointerString: The Hidden String Optimization

Working with Optional ObservableObject in SwiftUI

Preview Partially Generated Content: Foundation Models

@State vs @Binding in SwiftUI: When to Use Each

Configuring Claude Code Permissions for React Native

Failable Initializers for Optionals in SwiftUI Views

Resource Isolation in Swift Using Actors

Xcode MCP Server: Build Xcode into Your AI Workflow

How to Change the Screenshot Location on Mac

Auto-Switch Node Versions with nvm for React Native

Stop macOS Creating .DS_Store on Network & USB Drives

Detect When App Enters Background, Save State in SwiftUI

Implementing Undo/Redo in SwiftUI with UndoManager

Simulating Device Conditions in Xcode for Real-World Testing

Access Environment Values in View Extensions

How to Read Environment Variables in Swift (ProcessInfo)

Inspecting all SwiftUI Environment Values

Getting Current Disk Usage in Swift