Swiftdata

This covers the full SwiftData lifecycle: defining @Model classes with attributes and relationships, querying with @Query and #Predicate, managing concurrency with @ModelActor, and planning schema migrations with VersionedSchema. You'll reach for it when setting up persistence in a new iOS app, migrating from Core Data, or debugging why your relationships cascade incorrectly. The predicate syntax takes getting used to,it's expressive but limited compared to arbitrary Swift,and the migration examples show both lightweight and custom stages, which is helpful since Apple's docs gloss over the custom case. Solid reference when you're past the hello-world phase and need to handle real schema evolution or background imports.

skills.sh installs: 4.3K
GitHub stars: 1.3K
last updated: Aug 21, 2026

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Install

$ npx -y skills add dpearson2699/swift-ios-skills --skill swiftdata --agent claude-code

Installs into .claude/skills of the current project.

Files

SwiftData

Persist, query, and manage structured data in iOS 26+ apps using SwiftData with Swift 6.3.

Model Definition
ModelContainer Setup
CloudKit Sync
CRUD Operations
@Query in SwiftUI
#Predicate
FetchDescriptor
Schema Versioning and Migration
Core Data Coexistence Boundary
Concurrency (@ModelActor)
SwiftUI Integration
Common Mistakes
Review Checklist
References

Model Definition

Apply @Model to a class (not struct). It synthesizes PersistentModel conformance. Model instances remain context/actor-bound; pass their PersistentIdentifier, not the instance, across actors.

SKILL.md on GitHub

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