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@hoangnguyen0403Install SkillDevelopment
Skill
/ios-persistence
Implement local persistence with SwiftData, Core Data, and secure storage. Use when setting up SwiftData models, Core Data stacks, or local persistence in iOS.
Claude Code
$ npx -y skills add hoangnguyen0403/agent-skills-standard --skill ios-persistence --agent claude-code
Codex
$ npx skills add hoangnguyen0403/agent-skills-standard --skill ios-persistence -a codex -y
Cursor
$ npx skills add hoangnguyen0403/agent-skills-standard --skill ios-persistence -a cursor -y
Gemini CLI
$ npx skills add hoangnguyen0403/agent-skills-standard --skill ios-persistence -a gemini-cli -y
GitHub Copilot
$ npx skills add hoangnguyen0403/agent-skills-standard --skill ios-persistence -a github-copilot -y
OpenCode
$ npx skills add hoangnguyen0403/agent-skills-standard --skill ios-persistence -a opencode -y
Windsurf
$ npx skills add hoangnguyen0403/agent-skills-standard --skill ios-persistence -a windsurf -y
SKILL.md
ios-persistence.SKILL.mdname: ios-persistence
description: Implement local persistence with SwiftData, Core Data, and secure storage. Use when setting up SwiftData models, Core Data stacks, or local persistence in iOS.
metadata:
triggers:
files:
- '**/*.xcdatamodeld'
- '**/*Model.swift'
keywords:
- PersistentContainer
- FetchRequest
- ManagedObject
- Query
- ModelContainer
- RepositoryiOS Persistence
**Priority: P0 (CRITICAL)**
Implementation Workflow
1. **Choose storage tier** — SwiftData for iOS 17+, Core Data for legacy, Apple secure credential storage for secrets, UserDefaults for flags only. 2. **Define models** — Use `@Model` macro (SwiftData) or `.xcdatamodeld` (Core Data). 3. **Configure container** — Use `@MainActor` for `ModelContainer` (SwiftData) or `NSPersistentContainer` (Core Data). 4. **Perform background writes** — Use `newBackgroundContext()` (Core Data) to avoid UI lag; never heavy I/O on `viewContext`. 5. **Secure sensitive data** — Use secure storage for tokens and PII; never store in `UserDefaults`.
See [SwiftData and Core Data implementation examples](references/implementation.md)
Anti-Patterns
- **No Heavy I/O on `viewContext`**: Use private background contexts
- **No String-based Predicates**: Use KeyPaths or generated helpers
- **No Missing Merge Strategy**: Set the merge policy (`mergePolicy`) explicitly (e.g., `mergeByPropertyObjectTrump`)
References
- [SwiftData & Core Data Implementation](references/implementation.md)
Read more
name: ios-persistence
description: Implement local persistence with SwiftData, Core Data, and secure storage. Use when setting up SwiftData models, Core Data stacks, or local persistence in iOS.
metadata:
triggers:
files:
- '**/*.xcdatamodeld'
- '**/*Model.swift'
keywords:
- PersistentContainer
- FetchRequest
- ManagedObject
- Query
- ModelContainer
- RepositoryiOS Persistence
**Priority: P0 (CRITICAL)**
Implementation Workflow
1. **Choose storage tier** — SwiftData for iOS 17+, Core Data for legacy, Apple secure credential storage for secrets, UserDefaults for flags only. 2. **Define models** — Use `@Model` macro (SwiftData) or `.xcdatamodeld` (Core Data). 3. **Configure container** — Use `@MainActor` for `ModelContainer` (SwiftData) or `NSPersistentContainer` (Core Data). 4. **Perform background writes** — Use `newBackgroundContext()` (Core Data) to avoid UI lag; never heavy I/O on `viewContext`. 5. **Secure sensitive data** — Use secure storage for tokens and PII; never store in `UserDefaults`.
See [SwiftData and Core Data implementation examples](references/implementation.md)
Anti-Patterns
- **No Heavy I/O on `viewContext`**: Use private background contexts
- **No String-based Predicates**: Use KeyPaths or generated helpers
- **No Missing Merge Strategy**: Set the merge policy (`mergePolicy`) explicitly (e.g., `mergeByPropertyObjectTrump`)
References
- [SwiftData & Core Data Implementation](references/implementation.md)
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Questions about ios-persistence.
- Which coding agents can use ios-persistence?
- ios-persistence installs in Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and Windsurf with the skills CLI, using each agent's flag shown on this page. Flowy's auto-invocation, which fires a skill when your prompt matches, runs in Claude Code only.