All Posts

SwiftUI in Swift 6 fails with @State in view modifiers due to stricter concurrency & @MainActor. Learn solutions for alignmentGuide, scrollTransition & more.

Traps and Countermeasures for Abnormal onAppear Calls in SwiftUI

Discover unexpected SwiftUI onAppear behavior causing performance issues & state changes. Learn how to identify & temporarily fix abnormal calls in NavigationStack & TabView.

Model Inheritance in Core Data

Explore Core Data's model inheritance: Parent, Sub, and Abstract entities. Learn the pros, cons, and how to achieve similar effects without direct use.

Typefully: Say Goodbye to the Hassles of Social Media Posting

Struggling with social media posting? I share my experience using Typefully to manage & publish content across platforms efficiently. See how it helps!

Intentional Design or Technical Flaw? The Anomaly of onChange in SwiftUI Multi-Layer Navigation

Explore SwiftUI's `onChange` modifier “selective deafness” in multi-layer navigation. Understand why it might not trigger as expected and learn how to work around this issue.

Using Transactions Instead of Save in SwiftData and Core Data

Explore how to use transactions in SwiftData & Core Data for reliable data persistence. Improve app performance & ensure data integrity with proper transaction management.

Understanding SwiftUI's View Update Mechanism: Starting from a TimelineView Update Issue

Explore SwiftUI's view update mechanism with a TimelineView issue. Learn about view types, declarations, and instances for efficient UI updates.

Mastering Data Tracking and Notifications in Core Data and SwiftData

Explore data tracking in Core Data & SwiftData, from custom notifications to Persistent History Tracking, for robust data sync solutions. Learn key techniques.

Starting with Project Refactoring: Sharing Five Swift Modules

Explore five open-source Swift modules from a recent app refactor, including SimpleLogger, iCloudSyncStatusKit, ObservableDefaults, CoreDataEvolution, and ModelActorX.

Comprehensive Guide to Mastering KeyPath in Swift

Explore Swift KeyPath: understand its power, types (AnyKeyPath, WritableKeyPath), usage, and how it enhances metaprogramming. Master property access with KeyPath.

Reinventing Core Data Development with SwiftData Principles

Explore how to apply SwiftData's modern data modeling and concurrent programming principles within Core Data. Enhance stability, reliability, and innovation.

UserDefaults and Observation in SwiftUI: How to Achieve Precise Responsiveness

Explore how to efficiently manage UserDefaults with SwiftUI's Observation framework. This article provides a complete solution for precise, responsive data handling, including the @ObservableDefaults ...

NSManagedObjectID and PersistentIdentifier: Mastering Data Identifiers in Core Data and SwiftData

Sep 2024

Explore NSManagedObjectID and PersistentIdentifier in Core Data and SwiftData. Learn their features, usage, and how to manage data object identity efficiently.

Mastering Data Binning with Swift Charts

Sep 2024

Explore how to use Swift Charts’ advanced APIs for precise data binning. Learn about NumberBins and DateBins for efficient data processing and visualization. Discover how to improve app performance.

Considerations for Using Codable and Enums in SwiftData Models

Aug 2024

Explore key considerations for using Codable and enums in SwiftData models. Learn how SwiftData handles Codable, query predicates, and potential pitfalls to avoid.

Nested Grid Layout Anomaly: Analysis Approach and Resolution Strategies for SwiftUI Layout Issues

Aug 2024

Explore a SwiftUI Grid layout issue, learn analytical approaches & solutions for everyday SwiftUI development. Discover the root cause and a robust fix.

How to Tile Images in SwiftUI

Explore two SwiftUI image tiling methods: resizable & foregroundStyle with ImagePaint. Learn a custom Image construction for SF Symbols tiling.

Common Misconceptions About SwiftUI

Explore common SwiftUI misconceptions, including its learning curve, cross-platform capabilities, and code volume. Understand its true potential for better app development.

Developing an Infinite Four-Direction Scrollable Pager with SwiftUI

Explore how to build an infinite four-direction scrollable pager in SwiftUI, overcoming limitations and leveraging custom gestures. Learn key techniques and considerations.

Techniques for Automatic Merging of String Catalogs in Multi-Package Monorepos

Learn how to automatically merge String Catalogs across Swift packages in a monorepo during your main app's build, avoiding manual steps. Simplify i18n for Swift apps.

List or LazyVStack: Choosing the Right Lazy Container in SwiftUI

Explore SwiftUI's List and LazyVStack. Understand their differences, performance, and when to use each for optimal UI development and data display.

Swifter and Swifty: Mastering the Swift Testing Framework

Explore Swift Testing, Apple’s new framework for writing faster, Swifter tests that align with Swift programming habits. Learn how to configure, write expectations, organize test cases and much more.

The Evolution of SwiftUI Scroll Control APIs and Highlights from WWDC 2024

Explore the evolution of SwiftUI scroll control APIs, from WWDC 2019 to 2024. Learn about ScrollViewReader, scrollPosition, onScrollPhaseChange, & more.

Creating Stunning Dynamic Text Effects with TextRenderer

Explore SwiftUI's TextRenderer for dynamic text effects. Learn to customize text rendering, create colorful animations, & use transitions. Dive into the new WWDC 2024 feature!

Impressions on WWDC 2024

WWDC 2024 showcased Apple’s AI, Swift 6, SwiftData & SwiftUI updates. Explore how these impact future development and offer new possibilities. Learn about Apple’s innovative approach.

SwiftData in WWDC 2024: The Revolution Continues, Stability Still Awaits

Review of SwiftData's WWDC 2024 update: custom storage, Swift history, batch delete, new macros. Performance and stability concerns remain. Is it ready for projects?

Before WWDC 2024: The Future Potential and Real Challenges of SwiftData

Explore SwiftData's performance since Xcode 15 release & its future. We assess its role in Apple's ecosystem and highlight key issues, like predicate conversion and UI updates.

Before WWDC 2024: Reviewing Key SwiftUI Upgrades from 2019 to 2023 and Their Impact

Explore key SwiftUI upgrades from 2019 to 2023, including the Observation framework, SwiftData, and more. See how they've transformed app development.

What Does spacing = nil Mean in SwiftUI?

Explore SwiftUI spacing in-depth: understand what spacing = nil means, how default spacing is calculated, and when to use specific values. Learn practical spacing tips.

Mastering the containerRelativeFrame Modifier in SwiftUI

Explore SwiftUI's containerRelativeFrame modifier: definition, layout rules, use cases, and a backward-compatible replica. Master flexible layouts now!

Developing Embedded Applications with Swift

Explore using Swift for embedded development on the SwiftIO board. Learn how to abstract hardware, use familiar tools for development, and improve efficiency.

In-Depth Exploration of Overlay and Background Modifiers in SwiftUI

Explore SwiftUI's overlay and background modifiers, understanding their differences from ZStack, alignment logic, size control, and best practices for usage.

Core Data Reform: Achieving Elegant Concurrency Operations like SwiftData

Explore how to bring SwiftData's elegant concurrency to Core Data. Learn to implement a Core Data version of @ModelActor using custom executors for safer, efficient data handling.

The @State Specter: Analyzing a Bug in Multi-Window SwiftUI Applications

Explore a SwiftUI bug in multi-window apps using @State, causing shared states. Discover temp fixes & insights into @State.

New Frameworks, New Mindset: Unveiling the Observation and SwiftData Frameworks

Explore Observation & SwiftData frameworks from Let's VisionOS 2024. Learn how they solve existing issues, encouraging a new development mindset.

SwiftUI Views and @MainActor

Explore @MainActor in SwiftUI: understand its use, solve concurrency issues, and learn best practices for Swift 6. Dive into View protocol updates & practical tips.

Practical SwiftData: Building SwiftUI Applications with Modern Approaches

Learn how to integrate SwiftData with modern programming concepts in SwiftUI apps. This tutorial covers modularity, testability, and thread safety for robust data management.

Tips and Considerations for Using Lazy Containers in SwiftUI

Explore practical tips for using SwiftUI's lazy containers like List & LazyVStack. Enhance app performance, optimize resource use, and avoid common pitfalls.

How to Dynamically Construct Complex Predicates for SwiftData

Explore dynamically creating predicates for SwiftData, similar to NSCompoundPredicate, using PredicateExpression for flexible data filtering.

Swift Predicate: Usage, Composition, and Considerations

Explore Swift Predicate's structure, usage, and key considerations for data filtering. Learn how it enhances development with type safety, platform compatibility, and flexible syntax.

How to Handle Optional Values in SwiftData Predicates

Explore techniques for handling optional values when building SwiftData predicates, including optional chaining, nil-coalescing, and flatMap. Learn best practices.

Exploring Property Wrappers in SwiftUI: @UIApplicationDelegateAdaptor, @AccessibilityFocusState, @FocusedObject, @FocusedValue, and @FocusedBinding

Explore SwiftUI's powerful property wrappers: @UIApplicationDelegateAdaptor for UIKit integration, @AccessibilityFocusState for enhanced accessibility, and @FocusedObject, @FocusedValue, @FocusedBindi...

Exploring SwiftUI Property Wrappers: @FetchRequest, @SectionedFetchRequest, @Query, @Namespace, @Bindable

Explore SwiftUI property wrappers like @FetchRequest, @SectionedFetchRequest, @Query, @Namespace, & @Bindable. Learn how they simplify data fetching & view management.

Exploring SwiftUI Property Wrappers: @AppStorage, @SceneStorage, @FocusState, @GestureState and @ScaledMetric

Explore SwiftUI property wrappers like @AppStorage, @SceneStorage, @FocusState, @GestureState, & @ScaledMetric for data persistence, focus, gestures, & scaling.

Relationships in SwiftData: Changes and Considerations

Explore SwiftData's relationship handling changes, challenges, and considerations. Learn how its 'outside-in' approach impacts data modeling and performance.

Mastering Relationships in Core Data: Practical Application

Explore practical techniques for handling Core Data relationships, including optionals, collection types, derived attributes, subqueries, and optimization tips.

Mastering Relationships in Core Data: Fundamentals

Explore Core Data relationships: types (one-to-one, one-to-many, many-to-many), inverse relationships, delete rules, and optimization for efficient data management.

Blog Update Chronicle: Welcoming 2024 with a New Blog

Explore my journey of rebuilding my blog with AI and new technologies like Astro, TailwindCSS, and MDX. Learn about my experience and insights.

Exploring Key Property Wrappers in SwiftUI: @State, @Binding, @StateObject, @ObservedObject, @EnvironmentObject, and @Environment

Explore essential SwiftUI property wrappers: @State, @Binding, @StateObject, @ObservedObject, @EnvironmentObject, and @Environment. Understand their core functions and when to use each.

Advanced iCloud Documents: Understanding Placeholder Files, Space Optimization, and Operational Techniques

Explore iCloud Documents' unique features, placeholder files, space optimization, and file operations. Learn debugging tips for better cloud sync app development.

In-Depth Guide to iCloud Documents: Fundamental Setup and File Operations

Learn how to integrate iCloud Documents into your apps, perform file read/write, and handle content changes using NSFileCoordinator. Includes setup, access, and best practices.

SwiftUI geometryGroup() Guide: From Theory to Practice

Explore SwiftUI's geometryGroup() for handling animation anomalies and layout issues. Learn its usage, how it works, and alternatives for older SwiftUI versions.

Pair Programming with AI

Explore my experience rebuilding my blog with AI pair programming. Learn how I used AI tools like ChatGPT, Copilot, and Claude to master new languages, frameworks, and solve development challenges.

Mastering ViewThatFits

Explore SwiftUI's ViewThatFits: learn its rules, ideal size, usage, and how to recreate it with Layout protocol. Master adaptive layouts for your iOS apps.

GeometryReader: Blessing or Curse?

Explore GeometryReader's common problems in SwiftUI. Is it a curse or a blessing? Understand its layout, information retrieval, performance, and when to use it correctly. Includes new onGeometryChange...

How to Observe Data Changes in SwiftData using Persistent History Tracking

Explore how to observe specific data changes in SwiftData using Persistent History Tracking. Learn to manually respond to transactions for greater control, integration, and customization. Includes cod...

Mastering TipKit: Advanced

Explore advanced TipKit: customize views beyond TipView, integrate with UIKit, enable cross-app data sharing, reuse Tip code, and address FAQs. Learn how to observe status & more!

Mastering TipKit: Basics

Explore Apple's TipKit framework for displaying tips in your apps. Learn how to define, initialize, and customize tips using SwiftUI. Discover rules, events, and display strategies.

Concurrent Programming in SwiftData

Explore SwiftData's elegant concurrency mechanism, a successor to Core Data. Learn how it uses serial queues and Actors for safe, efficient multi-threading. Discover best practices for data access and...

Unveiling the Data Modeling Principles of SwiftData

Dive into SwiftData's code-first data models, exploring PersistentModel creation, Swift language features, and its relation to Core Data. Learn how it works!

Exploring CoreData - From Data Model Creation to Managed Object Instances

Sep 2023

Dive into Core Data's inner workings: learn how it builds managed object instances from a data model. Explore model creation, NSManagedObject subclasses, and more.

SwiftDataKit: Unleashing Advanced Core Data Features in SwiftData

Sep 2023

Explore how to use Core Data's advanced features in SwiftData with SwiftDataKit, bypassing the Core Data stack. Enhance SwiftData with grouped counts and subqueries.

Common Pitfalls Caused by Delayed State Updates in SwiftUI

Aug 2023

Explore two serious SwiftUI issues caused by delayed state updates: app freezes after sheet dismiss & navigation swipe, crashes when returning while scrolling. Solutions provided.

WWDC 2023, What’s New in Core Data

Jul 2023

Explore Core Data’s WWDC 2023 updates: composite attributes, Swift-friendly predicates, version checksum, deferred & staged migration. Learn how these enhancements benefit your data management.

The Secret to Flawless SwiftUI Animations: A Deep Dive into Transactions

Explore SwiftUI Transactions: principles, functions, and distribution for precise animation control. Learn about implicit, explicit animations, and how to use them effectively. Also, cover the latest ...

A Deep Dive Into Observation: A New Way to Boost SwiftUI Performance

Explore the Observation framework in Swift 5.9: Learn its creation, usage, and benefits for SwiftUI performance. Understand how it improves upon KVO and Combine.

Deep Dive into the New Features of ScrollView in SwiftUI 5

Explore SwiftUI 5's enhanced ScrollView with new APIs like contentMargins, safeAreaPadding, scrollIndicatorsFlash & more. Learn how to leverage these features for better scrolling experiences.

WWDC 23, First Impressions of SwiftUI 5 and SwiftData

WWDC 2023 unveils SwiftUI 5.0 with revolutionary data flow, animation upgrades, and enhanced ScrollView. Also, explore SwiftData, Apple’s new Swift-based persistence framework.

Five Years Since the Transplant

Five years post kidney transplant, I'm sharing my health journey, from onset of kidney issues, dialysis, to transplant & recovery. Learn about my experience & health data.

Building Stable Preview Views: How SwiftUI Previews Work

Explore SwiftUI preview's mechanism and limitations. Learn how it works via derived code, dynamic replacement, and XPC. Discover why previews crash & how to fix it.

What I Hope to See for Core Data at WWDC 2023

Discover the author's hopes for Core Data at WWDC 2023: Swift implementation, API upgrades, SQLite features, better model editor, and CloudKit improvements.

What I Hope to See for SwiftUI at WWDC 2023

Explore a SwiftUI wishlist for WWDC 2023: granular view updates, unified gestures, enhanced text handling, stable ForEach, & forward compatibility.

I Attended a SwiftUI Tech Salon in Beijing

Apr 2023

I attended Apple's SwiftUI Tech Salon in Beijing, learning from experts on multi-platform apps, custom layouts, and SwiftUI/UIKit integration. Key takeaways from the event.

Building Cross-Platform SwiftUI Apps

Apr 2023

Learn how to build cross-platform SwiftUI apps. This article covers key aspects like compatibility, data sources and adapting to multiple windows, based on a presentation at the SwiftUI Technology Sal...

AI Services that I am Currently Using

Apr 2023

Explore my current AI tools: Github Copilot for coding, Notion AI for text, Warp AI for terminals, MidJourney for art, and my mixed feelings about ChatGPT. Learn how AI enhances my workflow.

Timing of onAppear Invocation

Explore the timing of SwiftUI's onAppear modifier with evidence from new SwiftUI 4 APIs. Learn when onAppear is invoked: after layout, before rendering.

MacBook Pro Usage Experience

After a week with the MacBook Pro 14', I'm sharing my experience switching from an iMac, including data transfer, performance, and my impressions. Key takeaways: quiet operation, sufficient power, and...

Memory Optimization Journey for a SwiftUI + Core Data App

Optimize memory in SwiftUI + Core Data apps! This guide uses a sample to enhance performance, covering lazy views, managed objects, and row cache. Learn to reduce app crashes.

Layout in SwiftUI Way

Explore SwiftUI's powerful layout system by using multiple methods to achieve one UI goal. Learn about offset, alignmentGuide, NameSpace, ScrollView and more.

Cracking the Code: The Mysterious @State Injection Mechanism

Feb 2023

Explore SwiftUI @State injection optimization, modal view timing, and data coordination using a 'mysterious code' example. Learn how @State impacts updates in different contexts.

Customizing the Appearance and Interaction Behavior of Buttons

Feb 2023

Learn how to customize SwiftUI Button appearance and interaction using ButtonStyle & PrimitiveButtonStyle protocols. Add custom animations & control button behavior.

SwiftUI and Core Data: Safely Responding to Data

Dec 2022

Learn to handle Core Data in SwiftUI safely, prevent crashes, ensure real-time updates, and provide accurate data with best practices.

SwiftUI and Core Data: Data Fetching

Dec 2022

Learn how to efficiently fetch Core Data in SwiftUI with a custom FetchRequest using mock data for testing and previewing. Enhance your data handling strategies now!

SwiftUI and Core Data: Data Definition

Explore a modern approach to SwiftUI & Core Data data definition. Learn how to decouple views from managed objects using protocols for better flexibility & testability.

SwiftUI and Core Data: The Challenges

Explore the challenges of integrating Core Data with SwiftUI & TCA. Discover solutions to improve data definitions, testing, and concurrency, while retaining Core Data's strengths.

Adaptive Programmatic Navigation in SwiftUI

Create adaptive programmatic navigation in SwiftUI for different size modes, focusing on iPadOS & Stage Manager. Learn NavigationStack vs NavigationSplitView state management.

Unified Resource Management in Multi-package Projects

Learn how to manage resources uniformly in multi-package Swift projects using SPM. Avoid duplication, ensure synchronization, and keep a single copy.

Ask Apple 2022 Q&A Related to SwiftUI (Part 2)

Explore SwiftUI insights from Ask Apple 2022. This article compiles key Q&A, offering solutions on Form vs List, performance, custom layouts, and more. A must-read for SwiftUI developers seeking best ...

Ask Apple 2022 Q&A Related to SwiftUI (Part 1)

Explore SwiftUI solutions from Ask Apple 2022 Q&A. This article provides developer insights on UIActivityViewController, contextAction, testing @State, and more. Learn from Apple engineers.

Ask Apple 2022 Q&A Related on Core Data (Part 2)

Explore Core Data insights from Ask Apple 2022, Part 2. Learn about derived attributes, syncing, Spotlight, @FetchRequest, and more. Includes expert tips.

Ask Apple 2022 Q&A Related on Core Data (Part 1)

Explore Core Data insights from Ask Apple 2022 Q&A, covering topics like storing photos, iCloud sync, handling errors, data sharing, and more. Part 1 of a detailed analysis.

The Composable Architecture (TCA)

Explore the Composable Architecture (TCA), a powerful SwiftUI framework for complex app development. Learn its features, benefits, recent updates, and usage considerations.

SwiftUI’s StateObject and ObservedObject: The Key Differences

Explore the nuances of SwiftUI's StateObject and ObservedObject. Learn their principles, differences, and when to use each for optimal data management and view updates.

Reflections on iBug 16

SwiftUI 4's unprecedented bugs in 2022 reflect a broader issue of rapid development in Apple & beyond. Explore the impact of constant change and OTA's evolution.

Some Suitable Tutorials for SwiftUI Beginners

Explore beginner-friendly SwiftUI tutorials from Hacking with Swift, AppCoda, Design Code & more. Start your SwiftUI journey with ease!

How to Determine if ScrollView, List is Currently Scrolling in SwiftUI

Learn how to detect scrolling in SwiftUI using Introspect, Runloop, and PreferenceKey. Discover advantages and limitations. The IsScrolling library combines the last two methods for easy use.

Old Man New Soldier - A Development Memoir of an iOS APP

A developer’s journey of relearning programming & building an iOS app, Health Notes, using SwiftUI, Combine, & Core Data. Learn about challenges, tips, & insights.

Several Ways to Center Views in SwiftUI

Explore various methods to center views in SwiftUI, including Spacers, alignment guides like ZStack and frame, and GeometryReader. Understand each method's principles, scenarios, and considerations.

Implementing Keyword-based Search and Positioning in SwiftUI Text

Explore how to implement keyword search and highlighting in SwiftUI Text using AttributedString. Learn to navigate search results and enhance user experience.

Mixing Text and Image in SwiftUI

Explore how to mix text and images within SwiftUI's Text view. Learn techniques for dynamic sizing and text alignment. Includes practical examples and code.

Mastering the SwiftUI task Modifier

Explore SwiftUI's task modifier for async operations. Learn to handle cancellations, background tasks, & avoid unnecessary refreshes. Includes code examples & tips for older versions.

How to Avoid Repeating SwiftUI View Updates

Optimize SwiftUI view calculations: Avoid redundant updates using efficient parameters, view decomposition, Equatable, and event source control. Boost performance now!

Switching Core Data Cloud Sync Status in Real-Time

Explore how to enable or disable Core Data CloudKit sync in real-time using dual containers & persistent history tracking. Learn the implementation details.

SwiftUI Layout: Cracking the Size Code

Explore SwiftUI layout by imitating 'frame' and 'fixedSize' view modifiers. Learn about layout issues via examples, and the difference between appearance and essence.

SwiftUI Layout: The Mystery of Size

Explore SwiftUI size concepts for layout, understanding how proposed, required, and layout sizes work. Master SwiftUI layout with practical examples.

Alignment in SwiftUI: Everything You Need to Know

Explore SwiftUI alignment using the Layout protocol. Learn how alignment guides & view alignment work. Master SwiftUI layout for flexible UI design.

Creating Tables with Table in SwiftUI

Jun 2022

Learn how to use SwiftUI’s Table for creating interactive, multi-column tables on macOS & iPadOS. Explore features like sorting, selection, & implementing similar functionality on other platforms.

The New Navigation System in SwiftUI

Jun 2022

Explore SwiftUI 4.0's revamped navigation with NavigationStack & NavigationSplitView. Learn programmatic navigation, view stack management, & multi-column layouts.

Batch Operations in Core Data

Jun 2022

Explore Core Data's batch operations: principles, usage (delete, update, insert), advanced techniques, and essential considerations for efficient data handling.

How Core Data Saves Data in SQLite

Explore how Core Data saves data in SQLite. Learn about tables, fields, persistent history tracking, and entity relationships. Understand Z_PK, Z_ENT, and more.

Best Practices for Detecting and Opening URLs in SwiftUI

Explore SwiftUI's best ways to open URLs, from buttons to text links. Learn how to customize URL handling and auto-detect links within text for a seamless user experience.

Going Beyond @Published:Empowering Custom Property Wrappers

Explore how to make custom Swift property wrappers like @Published by enabling notifications to classes, using static subscript methods. Includes examples for @MyPublished, @PublishedObject, and @Clou...

Demystifying SwiftUI Animation: A Comprehensive Guide

Explore SwiftUI’s animation mechanism with detailed explanations and code. Learn timing curves, VectorArithmetic, transitions, and how to master smooth UI effects.

The Blogging Tools I'm Currently Using

Explore the tools I use for blogging, from data & text editing (Typora, VSCode), to screen capture (iShot, RocketSim), format conversion, image editing & hosting. Boost your workflow!

Demystifying SwiftUI List Responsiveness: Best Practices for Large Datasets

Explore SwiftUI list optimization through a case study. Learn how to identify & resolve performance issues when handling large datasets, plus best practices for smooth navigation.

Mastering zIndex in SwiftUI

Learn how to master zIndex in SwiftUI to control view layering, avoid animation issues, and use it effectively in various layout containers.

ViewBuilder Research: Creating a ViewBuilder Imitation

Explore SwiftUI's ViewBuilder by creating an imitation. Learn about view protocol, view types, and how SwiftUI handles views. Includes code examples for View, EmptyView, TupleView, and more.

ViewBuilder Research: Mastering Result Builders

Explore Swift result builders: custom containers, modifiers, compatibility, and limitations. Master ViewBuilder for SwiftUI view creation. Includes code examples.

SwiftUI Overlay Container 2: Customizable, Efficient, and Convenient View Manager

Mar 2022

SwiftUI Overlay Container is a customizable, efficient view manager for SwiftUI. Simplify view organization, transitions, animations, and more with ease. Try it now!

Blog Hiatus Notice

Jan 2022

My blog, "Fatbobman's Blog," has been live for 2 years now. The initial purpose of writing this blog was to document my learning process through writing, to deepen my understanding, and to share my fi...

Count Queries in Core Data: The Master Guide

Jan 2022

Explore various methods for querying and using count in Core Data, including countResultType, managed object context, result sets, relationships, and derived properties. Learn how to optimize count qu...

Customizing Gestures in SwiftUI

Jan 2022

Explore how to customize gestures in SwiftUI, including swipe, press, and click. Learn to use view modifiers, GestureState, and integrate UIKit gestures. Updated for iOS 18.

Exploring Xcode Playground (Part 2)

This article delves deeper into Xcode Playground, focusing on aspects such as auxiliary code, resource management, and exploring packages and Xcode projects with Playground. These tips and methods aim...

Exploring Xcode Playground (Part 1)

Master Xcode Playground: creation, debugging, stability & more. Explore tips for third-party libraries, resources, async & doc. Part 1 focuses on setup & debugging.

Swift Playgrounds 4: Entertainment or Productivity

Explore Swift Playgrounds 4's revolutionary features for iPad app development. Learn how it bridges education and productivity for Swift developers. Is it the future of mobile coding?

Using NSUbiquitousKeyValueStore with SwiftUI

Explore how to use NSUbiquitousKeyValueStore for cross-device data sharing in SwiftUI. Learn about its features, configurations, and practical usage with examples. Includes comparison to UserDefaults ...

Collaboration between Combine and async/await

Explore how Combine and async/await can work together effectively. Learn their advantages, how to serialize event processing, and integrate them in Swift development, with practical code examples.

Lifecycle of SwiftUI Views

Explore the SwiftUI view lifecycle, including struct instance creation, view value trees, and the nuances of onAppear and onDisappear. Learn to optimize your SwiftUI code.

Mastering Safe Area in SwiftUI

Explore SwiftUI SafeArea: Get SafeAreaInsets, draw views outside safe area, and modify it. Learn about GeometryReader, ignoresSafeArea, and safeAreaInset.

How to Deep Copy NSManagedObject in Core Data

Explore deep copying NSManagedObject in Core Data: challenges, solutions, and MOCloner tool. Learn how to handle complex relationships and customize data copying.

Implementing iOS Notes' Document Scanning Feature with Apple's Official API

Learn how to create a document scanning feature like iOS Notes using Apple's frameworks: VisionKit, Vision, NaturalLanguage & CoreSpotlight. Capture, recognize, & index scanned text.

Several Tips on Core Data Concurrency Programming

Explore Core Data concurrency tips: debug params, reduce blocking using perform, NSManagedObjectID & more. Enhance your app's performance & avoid common pitfalls.

Mastering Core Data Stack

Learn how to design a robust Core Data Stack, covering its functions, components like NSManagedObjectModel and NSPersistentStoreCoordinator, and configurations. Understand the evolution from basic set...

Understanding SwiftUI's onChange

Explore SwiftUI's onChange modifier: learn its features, usage, precautions, and alternatives. Understand how it observes values and triggers actions on change. Avoid common pitfalls for efficient cod...

How to use Derived and Transient Properties in Core Data

Explore Derived & Transient properties in Core Data. Learn how to set them up, use them for efficient data management, and understand their benefits & limitations.

Advanced SwiftUI TextField: Events, Focus, Keyboard

Explore advanced SwiftUI TextField techniques: events, focus switching, keyboard settings, and more. Master onEditingChanged, onSubmit, and FocusState for enhanced user input.

Reflecting on Two Years of Using Health Notes and My Physical Condition in Recent Years

Track my health journey with Health Notes for two years. See my physical improvements post-surgery, creatinine levels, and how data helps manage my health & even my dog’s health!

Advanced SwiftUI TextField: Formatting and Validation

Explore advanced SwiftUI TextField techniques: real-time formatting, invalid character filtering, and input condition validation. Learn to enhance your app’s text input.

AttributedString: Making Text More Beautiful Than Ever

Explore Apple's AttributedString, a Swift alternative to NSAttributedString for styled text. Learn to create custom attributes, use Markdown, & more.

Apple’s New Formatter API: Comparison of Old and New and How to Customize

Explore Apple's new Formatter API in Swift. Learn its design, compare it with the old API, and discover how to create custom formatters with practical examples, including UIColor formatting.

Globalize Your SwiftUI App: A Comprehensive Guide to Localization

Learn how to localize text in SwiftUI apps, covering string files, plural rules, & device-specific settings. Includes examples for dates, currencies, & more. Get practical localization tips.

Showcasing Core Data in Applications with Spotlight

Learn how to use NSCoreDataSpotlightDelegate to add your app's Core Data to Spotlight, increasing visibility and user findability. Updated for WWDC 2021, includes persistent history for automatic upda...

SheetKit: SwiftUI Modal View Extension Library

SheetKit is a SwiftUI extension library for modal views, offering methods for presenting, dismissing, and managing sheets, fullScreenCovers, and custom bottomSheets. It enhances deep link handling and...

How to Implement interactiveDismissDisabled in SwiftUI

Explore how to enhance SwiftUI 3.0's interactiveDismissDisabled with functional extensions. Control sheet dismissal & get user gesture notifications. Learn the implementation!

Core Data with CloudKit: Sharing Data in the iCloud

Explore how to build apps that share data with multiple iCloud users using Core Data with CloudKit. Learn about owners, participants, CKShare, and more.

Rebuilding SwiftUI's Redux-like State Container with Async-Await

Refactor SwiftUI state container with Swift 5.5's Async/Await. Learn how to handle side effects and ensure main thread updates for your app's state management.

Enhancing SwiftUI Navigation Views with NavigationViewKit

NavigationViewKit, a SwiftUI extension, solves native NavigationView issues like root view navigation, code-based navigation, and inconsistent column displays. It offers convenient, SwiftUI-style navi...

How to Preview a SwiftUI View with Core Data Elements in Xcode

Explore reasons for SwiftUI preview crashes with Core Data, learn to avoid them, and reliably preview views in Xcode. Includes tips on data management for previews.

Using UIKit Views in SwiftUI

Learn how to use UIKit views in SwiftUI, style them, and understand key considerations when wrapping a UITextField. Master UIViewRepresentable for seamless integration.

Blog Update Journal

I renovated my blog, diving into web technologies like CSS & JavaScript, mastering Visual Studio Code. This update added comments, responsive layout, & TOC.

Core Data with CloudKit: Synchronizing Public Database

Learn how to synchronize a public CloudKit database to your local Core Data, creating a mirror for offline access. Explore public vs private databases, and sync mechanisms.

Core Data with CloudKit: Troubleshooting

Explore common issues in Core Data with CloudKit projects, including sync errors, migration problems, & account issues. Learn debugging tips and solutions.

Core Data with CloudKit: Exploring the CloudKit Dashboard

Explore the CloudKit Dashboard: databases, environments, security roles, indexes, record types, zones, records, subscriptions, tokens, telemetry, & logs. Understand CloudKit functionalities for Core D...

Core Data with CloudKit: Syncing Local Database to iCloud Private Database

Explore Core Data with CloudKit: sync local database to iCloud private database. Learn setup, syncable model considerations, and selective data synchronization for your app.

Core Data with CloudKit: The Basics

Explore Core Data with CloudKit: seamless cloud storage & multi-device sync for your apps. Learn its advantages, limitations, and key concepts. Dive in now!

Mastering @AppStorage in SwiftUI

Jul 2021

Explore efficient, secure @AppStorage usage in SwiftUI without third-party libs. Solve data type limits, tedious declarations, and injection issues. Includes central injection.

Using Persistent History Tracking in CoreData

Jul 2021

Explore CoreData's Persistent History Tracking: Respond to changes, fetch, merge, & purge transactions. Includes code for batch ops, app groups, & CloudKit sync. Enhance your app!

Impressions After WWDC 2021

Jun 2021

WWDC 2021: My take on iOS 15, Swift 5.5's async, SwiftUI's enhancements, CloudKit sharing, & Xcode's improvements. A developer's perspective.

Setting Up a Swift Development and Debugging Environment on Linux

Feb 2021

Learn how to set up a robust Swift development & debugging environment on Linux. This guide covers installing Swift Toolchain, LSP, LLDB, SwiftFormat and SwiftLint for a cross-platform experience.

Creating a Blog with Publish: Plugin

Feb 2021

Explore Publish plugins: enhance your blog with custom features. Learn adding tags, attributes, full-text search & more via examples. Dive into Publish's extension methods!

Creating a Blog with Publish: Theme

Feb 2021

Explore Publish theme development using Plot, a Swift HTML generation tool. Learn to build a custom theme with type safety and a DSL-like syntax for your static website.

Creating a Blog with Publish: Getting Started

Jan 2021

“Explore Publish, a Swift static site generator for developers. Learn installation, project setup, core concepts like sections, items, & themes. Get started now!”

Adapting to iPad in SwiftUI

Explore insights and lessons learned while adapting a SwiftUI app for iPad. Learn about device detection, layout adjustments, and navigation challenges. Key code snippets included.

Discussing CoreData Usage in SwiftUI

Explore lessons learned using CoreData in SwiftUI development over the past year. Discover insights on persistent storage, dynamic @FetchRequest, a transformation layer, and issues with NSPersistentCl...

Introducing Several Swift or SwiftUI Third-Party Libraries Used in Developing Health Notes 2

Explore the open-source Swift and SwiftUI libraries used in Health Notes 2, including SwiftUIX, Charts, Introspect, SwiftDate and more. Enhance your iOS development!

Development Musings for Health Notes 2.0 (Part 6)

The final stages of a project are often the most tedious.

Health Notes 2.0 Official Version is Complete!

After months of preparation and development, Health Notes 2.0 is finally here! Experience significant improvements in functionality, performance, and UI. Download now!

Development Musings for Health Notes 2.0 (Part 5)

The National Day and Mid-Autumn Festival holiday is about to end, and it's been a while since my last essay. In recent days, I have been continuing the development process while also expending conside...

Development Musings for Health Notes 2.0 (Part 4)

This week, I haven't had much energy or mood for coding. Over the last few days, building on the unified sheet management and real-time Form base, I completed a Sheet that can control the cancel gestu...

Creating a Sheet in SwiftUI with Controllable Cancel Gestures

Create a real-time form within a SwiftUI Sheet, manage cancel gestures, and respond to form status changes. Learn how to control Sheet dismissal based on user edits.

Development Musings for Health Notes 2.0 (Part 3)

Due to a family member's sudden illness, I have been frequently visiting the hospital recently, which has significantly limited my time for development.

How to Create a Real-Time Responsive Form in SwiftUI

Learn how to build real-time responsive forms in SwiftUI with MVVM. This article covers input validation, data handling, and creating a seamless user experience.

Pop Up Different Sheets in SwiftUI as Needed

Explore SwiftUI sheets, from basic usage to advanced techniques using item-based activation and reducer approaches to avoid crashes and improve code readability.

Development Musings for Health Notes 2.0 (Part 2)

Due to other miscellaneous matters this week, I could only guarantee about 2-3 hours per day for development, so there hasn't been much progress. However, fortunately, I don't have any explicit progre...

Discussing List and ForEach in SwiftUI

Explore SwiftUI List & ForEach: Discover performance issues with ForEach when handling large datasets & learn how to optimize with List or SwiftUIX. Learn when to use ForEach.

Development Musings for Health Notes 2.0 (Part 1)

Health Notes has been online since January 2020, and now more than half a year has passed. During this period, I have gained further understanding and knowledge of Swift, SwiftUI, CoreData, etc. Most ...

SwiftUIOverlayContainer — A SwiftUI Library for Creating Customized Popup Views

Create custom popup views easily with SwiftUIOverlayContainer. This library offers full control over animations, styles, & interactions, letting you focus on the view's content. Enhanced flexibility f...

Implementing the Side Menu for the iOS Mail App with SwiftUI

With the continuous improvement of SwiftUI 2.0, I feel it's time to make a major upgrade to my app. I've always wanted to implement an elegant side menu effect in my app similar to the iOS mail app, a...

HowTo —— File Import and Export in SwiftUI 2.0

Explore SwiftUI 2.0's native file import & export. Learn about fileImporter, fileExporter, and fileMover, handling permissions, and sample code.

HowTo —— Using ScrollViewReader to Scroll to Position in SwiftUI 2.0

Learn how to use ScrollViewReader in SwiftUI 2.0 for easy scroll positioning using IDs, a departure from offset-based solutions. Includes examples & drawbacks.

HowTo —— Using ProgressView in SwiftUI 2.0 to Display Progress Bars

Explore SwiftUI 2.0's ProgressView for creating spinning indicators and linear progress bars. Learn to customize styles and use code examples to enhance your app.

HowTo —— Handling Universal Links with onOpenURL

Learn how to handle Universal Links in SwiftUI 2.0 using onOpenURL, a view modifier that simplifies URL handling, unlike AppDelegate. See example code and usage tips.

HowTo —— Use ToolBar to Replace navigationbarItems in SwiftUI2.0

Explore SwiftUI 2.0's ToolBar, a versatile replacement for navigationbarItems, offering enhanced multi-platform support and cleaner syntax. Learn its basic usage and adaptations.

HowTo —— Use Link or openURL to open URL scheme in SwiftUI2.0

Learn how to use Link and openURL in SwiftUI 2.0 to open URL schemes and launch other apps. Includes code examples for Safari, mail, and phone calls.

HowTO —— SwiftUI 2.0 LazyGrid

Explore SwiftUI 2.0's native Lazy Grid control (LazyVGrid & LazyHGrid), replacing third-party libraries. Learn basic usage, mixing grids, and dynamic layouts.

HowTo —— How to Use Label in SwiftUI 2.0

Learn how to use SwiftUI 2.0's Label for combining images & text. Explore custom styles & a custom Label widget for more control. Includes code examples.

HowTo - SwiftUI 2.0 LazyVStack and LazyHStack

Explore SwiftUI 2.0's LazyVStack & LazyHStack for optimized view rendering. Improve app performance with lazy loading. See basic usage & continuous list examples.

HowTo - Displaying Maps in a View with Swift 2.0

Learn how to easily display maps in your Swift 2.0 app using MapKit. This tutorial covers adding map elements, tracking user location, and custom markers.

SwiftUI 2.0 — Apps, Scenes, and New Code Structures (Part 2)

Explore SwiftUI 2.0's data flow enhancements with @AppStorage, @SceneStorage, and updated property wrappers. Learn to manage state and build efficient, modular apps.

SwiftUI 2.0 — App, Scene, and New Code Structure (Part 1)

Explore SwiftUI 2.0's App & Scene protocols, new data flow structures, and preset Scenes like WindowGroup & DocumentGroup. Learn system event responses and more.

@FocusedBinding Overview