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Fixing SwiftUI Previews That Won't Load
XcodeSwiftUIDebuggingPreviews
When SwiftUI previews fail with cryptic errors or just spin forever, here's how to diagnose and fix the most common causes.
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- 02
Xcode MCP Server: Build Xcode into Your AI Workflow
XcodeAIDevelopment-EnvironmentXcode 26.3 ships with a built-in MCP server that exposes project structure, build actions, and test results to external AI tools. Here's how to set it up.
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How to Change the Screenshot Location on Mac
macOSDevelopment-EnvironmentChange where Mac screenshots save with Cmd+Shift+5 then Options, or run defaults write com.apple.screencapture location in Terminal. Takes 30 seconds.
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Auto-Switch Node Versions with nvm for React Native
macOSDevelopment-EnvironmentReact-NativeAvoid cryptic build failures by setting up nvm to automatically use the right Node version when you cd into a project.
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How to Access the App Delegate in Swift
SwiftUIKitAppDelegateSwiftUILearn how to access your app's App Delegate from anywhere in your Swift code, including from SwiftUI views.
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Accessing the Camera Roll in SwiftUI
SwiftUIUIKitImagesPrivacyConfigurationLearn how to access photos from the camera roll in SwiftUI, including required permissions, Info.plist configuration, and using PhotosPicker for iOS 16+ or UIImagePickerController for earlier versions.
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Detecting When a Screenshot is Taken in SwiftUI
SwiftUIUIKitSecurityPrivacyLearn how to detect when users take screenshots in your SwiftUI app by observing UIApplication notifications.
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TextEditor Horizontal Padding in SwiftUI: contentMargins
SwiftUITextEditorLayoutiOS-17Learn how to add horizontal padding inside a TextEditor without affecting the scrollbar using the contentMargins modifier introduced in iOS 17.
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Stop macOS Creating .DS_Store on Network & USB Drives
macOSConfigurationDevelopment-EnvironmentStop macOS from writing .DS_Store files to network shares and USB drives with one Terminal command. Keep your repos and external drives clean.
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Control Sheet Height with presentationDetents in SwiftUI
SwiftUISheetUIModaliOS-16Learn how to use the presentationDetents modifier to control sheet heights in SwiftUI, creating interactive bottom sheets similar to Apple Maps and Music.
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Add Spacing to Toolbars with ToolbarSpacer in SwiftUI
SwiftUIToolbarUILayoutiOS-26Learn how to use ToolbarSpacer to add fixed and flexible spacing between toolbar items in SwiftUI, new in iOS 26.
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Detect When App Enters Background, Save State in SwiftUI
SwiftUILifecycleState-ManagementPersistenceLearn how to detect app lifecycle changes in SwiftUI, save state when your app enters the background, and restore it when users return, using scenePhase and UIApplication notifications.
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Detecting Low Power Mode in SwiftUI to Adapt Your UI
SwiftUIPerformanceBatteryiOSLearn how to detect when users enable Low Power Mode and automatically reduce animations, refresh rates, and visual effects to preserve battery life in your SwiftUI app.
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Detect Successful Share Sheet Completion in SwiftUI
SwiftUIUIKitShareActivityViewControllerLearn how to detect when a user successfully shares content using a share sheet in SwiftUI by wrapping UIActivityViewController.
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Keyboard-Aware Floating Action Button (FAB) in SwiftUI
SwiftUIKeyboardUILayoutLearn how to create a Material Design-style floating action button in SwiftUI that intelligently moves above the keyboard and avoids blocking text input fields.
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Managing Keyboard Toolbar Items in SwiftUI (iOS 15+)
SwiftUIKeyboardTextFieldTextEditorLearn how to add custom toolbar buttons above the keyboard in SwiftUI using the .toolbar modifier with keyboard placement for Done buttons, formatting controls, and more.
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Preventing Screenshot Capture in SwiftUI Views
SwiftUISecurityPrivacyUIKitLearn how to prevent users from taking screenshots of sensitive content in your SwiftUI app using field-level security and UIKit bridging for financial, medical, or private data protection.
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Implementing Pull-to-Refresh Without List in SwiftUI
SwiftUIScrollViewUIKitAsyncLearn how to add pull-to-refresh functionality to custom ScrollViews in SwiftUI without using List, perfect for custom layouts and complex scroll content.
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How to Replace Characters in a String in Swift
SwiftStringTextManipulationLearn multiple approaches to replace characters and substrings in Swift strings, from simple replacements to pattern-based transformations.
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Creating Skeleton Loading Views (Shimmer Effect) in SwiftUI
SwiftUIAnimationUILoadingLearn how to build skeleton loading screens with animated shimmer effects in SwiftUI using gradients, AnimatableModifier, and reusable view modifiers for a polished loading experience.
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Implementing Undo/Redo in SwiftUI with UndoManager
SwiftUIUndoManagerState-ManagementLearn how to implement undo/redo functionality in SwiftUI using UndoManager, including environment injection, registering actions, and creating undo buttons for professional editing experiences.
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Prevent Drag-to-Dismiss on SwiftUI Sheets
SwiftUISheetUIModalLearn how to prevent users from dismissing modal sheets by swiping down in SwiftUI using interactiveDismissDisabled.
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Simulating Device Conditions in Xcode for Real-World Testing
XcodeTestingPerformanceDevelopmentLearn how to use Xcode's Device Conditions feature to simulate thermal state and network conditions to test your app under real-world stress scenarios.
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UIApplicationDelegateAdaptor: Add an AppDelegate in SwiftUI
SwiftUIAppDelegateUIKitLifecycleAdd an AppDelegate to a SwiftUI app with @UIApplicationDelegateAdaptor to handle push tokens, launch options, and lifecycle callbacks SwiftUI lacks.
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Symbolicating Swift Crash Reports in Xcode
XcodeDebuggingCrash-ReportingProductionLearn how to symbolicate crash logs from App Store Connect and Xcode Cloud to debug production crashes effectively.
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Access Environment Values in View Extensions
SwiftUIEnvironmentViewModifierExtensionsLearn how to access SwiftUI environment values in View extensions using ViewModifiers for clean, reusable code.
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How to generate QR codes in SwiftUI
SwiftUICoreImageQRImagesLearn how to create and display QR codes in SwiftUI using Core Image filters.
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How to search SF Symbols in Xcode
XcodeSwiftUIDesignFind any SF Symbol by name without leaving Xcode, using the Library panel search and a few shortcuts.
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How to Read Environment Variables in Swift (ProcessInfo)
SwiftConfigurationEnvironmentDevelopmentRead an environment variable in Swift with ProcessInfo.processInfo.environment["KEY"]. Set values per scheme in Xcode or pass them to xcodebuild in CI.
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Inspecting all SwiftUI Environment Values
SwiftUIEnvironmentDebuggingDevelopmentLearn how to dump all SwiftUI environment values for debugging purposes.
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