Core Data + Observation: From Property-Level Reactivity to a Freer Mental Model
Bring SwiftData-like Observation to Core Data with CDE. Discover how to achieve property-level tracking in SwiftUI and solve key engineering challenges.
Core Data
43 posts
- Core Data43
- SwiftUI137
- Swift32
- Frameworks24
- SwiftData24
- Concurrency16
- Dev Diary16
- Guest Post16
- Dev Tools15
- Apple Event13
- AI11
- CloudKit11
- Web10
- Life8
- Tools1
- tvOS1
- watchOS1
20264 posts
CDE: An Attempt to Make Core Data Feel More Like Modern Swift
In my previous article, I discussed the current reality of Core Data in today's projects: it hasn't disappeared, and it still has unique value, but the disconnect between it and modern Swift projects is becoming increasingly apparent. In this article, I will introduce my experimental project Core Data Evolution, exploring whether we can make Core Data continue to exist in modern Swift projects in a more natural way?
Why I'm Still Thinking About Core Data in 2026
Core Data remains widely used in 2026, but its mismatch with modern Swift concurrency, type safety, and code expression is growing. This article outlines the three core pain points and introduces a path to modernization without abandoning Core Data.
Why Does Passing NSManagedObjectContext Across Isolation Domains No Longer Error in Swift 6.2? The Real Change Isn't in the Compiler
Why NSManagedObjectContext no longer triggers concurrency errors in Swift 6.2? The real change lies in Core Data’s SDK import semantics, not the compiler itself. NSManagedObjectContext is now marked with NS_SWIFT_SENDABLE and NS_SWIFT_NONISOLATED in Xcode 26
20252 posts
Core Data Migration Incident Analysis: The Hidden Traps We Overlooked
Core Data model migration caused app freezes after updates? Learn how wal_checkpoint=PASSIVE leads to migration timeouts and how to avoid main thread blocking with background initialization and WAL optimization.
Building Type‑Safe, High‑Performance SwiftData / Core Data Models
Learn to build Type-safe, efficient SwiftData/Core Data models using computed properties, bitmasks, and custom types like ValidatedName to enforce business logic and improve query performance.
20249 posts
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.
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.
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.
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.
NSManagedObjectID and PersistentIdentifier: Mastering Data Identifiers in Core Data and SwiftData
Explore NSManagedObjectID and PersistentIdentifier in Core Data and SwiftData. Learn their features, usage, and how to manage data object identity efficiently.
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.
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.
20234 posts
Exploring CoreData - From Data Model Creation to Managed Object Instances
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
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.
WWDC 2023, What’s New in Core Data
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.
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.
202210 posts
SwiftUI and Core Data: Safely Responding to Data
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
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.
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.
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.
Batch Operations in Core Data
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.
Count Queries in Core Data: The Master Guide
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 queries for different scenarios.
202113 posts
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.
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 setup to advanced features like CloudKit and persistent history tracking.
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.
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 updates.
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.
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.
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 Data projects.
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!
Using Persistent History Tracking in CoreData
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!
20201 posts
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 NSPersistentCloudKitContainer. Avoid SQL thinking with CoreData.