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swiftdata

Implement and review SwiftData persistence for iOS 26+ Swift applications.

1|Updated Jun 24, 2026
Search Tags:#swift#ios#persistence#swiftui#swiftdata#cloudkit#coredata
One-click install
npx skills add https://github.com/eric-sabe/engsys --skill swiftdata-eric-sabe
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swiftdata
Source: https://github.com/eric-sabe/engsys/tree/main/stacks/lang/swift/skills/swiftdata
Command: npx skills add https://github.com/eric-sabe/engsys --skill swiftdata-eric-sabe

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill eliminates the friction of implementing, reviewing, and fixing data persistence in iOS 26+ Swift apps using SwiftData, reducing errors from common misconfigurations and simplifying complex workflows like schema migration and cross-stack coexistence.

Core Features & Use Cases

  • Model & CRUD Operations: Correctly define @Model classes with @Attribute, @Relationship, and @Transient properties, and perform create, read, update, and delete operations with ModelContext.
  • Querying & Filtering: Use @Query, #Predicate, and FetchDescriptor to efficiently retrieve and filter data in SwiftUI views, including dynamic and sectioned queries.
  • Schema & Migration Management: Handle schema versioning with VersionedSchema and SchemaMigrationPlan, and migrate existing Core Data stores to SwiftData without data loss.
  • Advanced Configuration: Set up CloudKit sync, background processing with @ModelActor, custom data stores, and coexistence with Core Data for gradual adoption.
  • Use Case: For a travel app, use this Skill to implement persistent storage for trip and accommodation data, add CloudKit sync for cross-device access, and migrate from an existing Core Data backend.

Quick Start

Use the swiftdata skill to implement SwiftData persistence for your iOS app's trip model, including CloudKit sync configuration and Core Data migration setup.

Frequently Asked Questions about swiftdata

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I implement SwiftData persistence for an iOS app?▼

Implement SwiftData persistence by defining @Model data structures and configuring ModelContainer with ModelContext to handle CRUD operations in iOS 26+ Swift applications. This provides type-safe, Swift-native persistent storage integrated with SwiftUI.

What is the best way to migrate an existing Core Data store to SwiftData?▼

Migrating Core Data stores to SwiftData requires using VersionedSchema and SchemaMigrationPlan to handle schema versioning without data loss. This approach supports gradual adoption and coexistence between Core Data and SwiftData backends.

How do I filter SwiftData queries in SwiftUI views?▼

Filter SwiftData queries in SwiftUI views by using @Query with #Predicate and FetchDescriptor to efficiently retrieve and match data. This enables dynamic and sectioned queries for type-safe data fetching.

Can I use SwiftData with CloudKit for cross-device syncing?▼

SwiftData supports CloudKit synchronization to enable cross-device data access for iOS 26+ applications. Setting up CloudKit sync involves configuring the ModelContainer to automatically handle background data replication.

Does SwiftData support background processing and concurrency?▼

SwiftData handles background processing and concurrency by using @ModelActor to manage ModelContext operations safely across threads. This ensures type-safe concurrent data access during complex persistent storage workflows.

When should I use @Attribute and @Relationship in SwiftData models?▼

Use @Attribute and @Relationship when defining @Model classes to correctly configure persistent data structures and manage data relationships. @Transient properties can also be applied to exclude non-persistent fields from storage.

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