SNAP - SN App Packages

SNAP is a set of Swift packages I use to build iOS apps. This repository is the overview for the suite; the packages live in their own repositories.

The packages contain shared code, reusable implementations of common app features, and a template for starting a new app. They are public for reference and feedback, but they are mainly shaped around my own projects.

Highlights

• snap-template contains shared app code and the demo project that shows the suite in use.
• snap-style abstracts semantic colors, fonts, icons and numbers for SwiftUI apps.
• Other packages cover foundation extensions, SwiftUI helpers, settings storage, navigation, dependency injection and SwiftData/CoreData interop.

Guides

You need rules to break them, so I made up some of my own: conventions.

Packages are set up as described in package-template.md.

Package Dependencies

flowchart TD

    subgraph Snap-Packages
    C1[snap-foundation]
    C2[snap-core]
    M2(snap-style)
    M3(snap-settings-service)
    M4(snap-navigation)
    M5(snap-dependencies)
    M6(snap-swift-data)
    M1(snap-template)
    end
    
    A1{SnapTemplateDemo}

    subgraph Apps
    A3{... App}
    end

    C1 --> C2
    C1 --> M4
    C1 --> M5

    C2 --> M2
    C2 --> M3

    M2 --> M1
    M3 --> M1
    M4 --> M1
    M5 --> M1

    M1 --> A1

    A1 -.->|Copy| Apps
    M6 --> Apps

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Mermaid: Docs, Editor

Packages

snap-foundation

snap-foundation contains basic extensions for Swift and Foundation.

snap-core

snap-core contains Swift, SwiftUI and UIKit extensions, helper implementations, convenience definitions and workarounds.

snap-style

snap-style abstracts colors, fonts, icons and numbers for multi-platform SwiftUI apps. Define semantic attributes in a theme and apply them in views.

snap-settings-service

snap-settings-service stores Codable values for String keys in UserDefaults, NSUbiquitousKeyValueStore, or a custom store.

snap-navigation

snap-navigation defines SwiftUI navigation structure separately from presentation. It supports selectable destinations, stack pushes, modal presentation, deeplinks and multiple presentation styles.

snap-dependencies

snap-dependencies provides a dependency injection container based on Dependencies key paths and a @Dependency property wrapper.

snap-swift-data

snap-swift-data improves interoperability between SwiftData, CoreData objects, and Persistent History Tracking.

snap-template

snap-template contains shared code and a demo Xcode project for using SNAP in an iOS app. The demo includes prepared app structure, navigation and infrastructure.

History

• The snap-app-template was moved as Demo project into snap-template.
• snap-matching-navigation was replaced by snap-navigation.
• snap-theme was replaced by snap-style.

Package Collections

Not working at the moment (2026-05)! The Generator does not build, will try again in the future.

packages.json is prepared.

Swift Package Collection Generator