AppState

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🧠 Effortless State Management and Dependency Injection for Swift 6 Applications

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# AppState

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Read this in other languages: [French](documentation/README.fr.md) | [German](documentation/README.de.md) | [Hindi](documentation/README.hi.md) | [Portuguese](documentation/README.pt.md) | [Russian](documentation/README.ru.md) | [Simplified Chinese](documentation/README.zh-CN.md) | [Spanish](documentation/README.es.md)

**AppState** is a Swift 6 library for managing application state in a thread-safe, type-safe, and SwiftUI-friendly way. Centralize and synchronize state across your app; inject dependencies anywhere.

## Requirements

- **iOS**: 17.0+
- **watchOS**: 10.0+
- **macOS**: 14.0+
- **tvOS**: 17.0+
- **visionOS**: 1.0+
- **Swift**: 6.0+
- **Xcode**: 16.0+
  
**Non-Apple Platform Support**: Linux & Windows

> 🍎 Features marked with this symbol are specific to Apple platforms, as they rely on Apple technologies such as iCloud and the Keychain.

## Key Features

**AppState** includes:

- **State**: Centralized state management that allows you to encapsulate and broadcast changes across the app.
- **StoredState**: Persistent state using `UserDefaults`, ideal for saving small amounts of data between app launches.
- **FileState**: Persistent state stored using `FileManager`, useful for storing larger amounts of data securely on disk.
- 🍎 **SwiftData (ModelState)**: Manage SwiftData `@Model` objects through AppState by injecting a shared `ModelContainer` and reading/writing models with `ModelState`.
- 🍎 **SyncState**: Synchronize state across multiple devices using iCloud, ensuring consistency in user preferences and settings.
- 🍎 **SecureState**: Store sensitive data securely using the Keychain, protecting user information such as tokens or passwords.
- **Dependency Management**: Inject dependencies like network services or database clients across your app for better modularity and testing.
- **Slicing**: Access specific parts of a state or dependency for granular control without needing to manage the entire application state.
- **Constants**: Access read-only slices of your state when you need immutable values.
- **Observed Dependencies**: Observe `ObservableObject` dependencies so your views update when they change.

## Getting Started

Add **AppState** via Swift Package Manager — see the [Installation Guide](documentation/en/installation.md). Then check the [Usage Overview](documentation/en/usage-overview.md) for a quick introduction.

## Quick Example

```swift
import AppState
import SwiftUI

private extension Application {
    var counter: State<Int> {
        state(initial: 0)
    }
}

struct ContentView: View {
    @AppState(\.counter) var counter: Int

var body: some View {
        VStack {
            Text("Count: \(counter)")
            Button("Increment") { counter += 1 }
        }
    }
}
```

## Documentation

Here’s a detailed breakdown of **AppState**'s documentation:

- [Installation Guide](documentation/en/installation.md): How to add **AppState** to your project using Swift Package Manager.
- [Usage Overview](documentation/en/usage-overview.md): An overview of key features with example implementations.
  
### Detailed Usage Guides:

- [State and Dependency Management](documentation/en/usage-state-dependency.md): Centralize state and inject dependencies throughout your app.
- [Slicing State](documentation/en/usage-slice.md): Access and modify specific parts of the state.
- [StoredState Usage Guide](documentation/en/usage-storedstate.md): How to persist lightweight data using `StoredState`.
- [FileState Usage Guide](documentation/en/usage-filestate.md): Learn how to persist larger amounts of data securely on disk.
- 🍎 [ModelState Usage Guide](documentation/en/usage-modelstate.md): Manage SwiftData `@Model` objects through a shared `ModelContainer`.
- [Keychain SecureState Usage](documentation/en/usage-securestate.md): Store sensitive data securely using the Keychain.
- [iCloud Syncing with SyncState](documentation/en/usage-syncstate.md): Keep state synchronized across devices using iCloud.
- [Upgrading to AppState 3.0](documentation/en/upgrade-to-v3.md): Breaking changes and how to migrate from the 2.x release line.
- [FAQ](documentation/en/faq.md): Answers to common questions when using **AppState**.
- [Constant Usage Guide](documentation/en/usage-constant.md): Access read-only values from your state.
- [ObservedDependency Usage Guide](documentation/en/usage-observeddependency.md): Work with `ObservableObject` dependencies in your views.
- [Advanced Usage](documentation/en/advanced-usage.md): Techniques like just‑in‑time creation and preloading dependencies.
- [Best Practices](documentation/en/best-practices.md): Tips for structuring your app’s state effectively.
- [Migration Considerations](documentation/en/migration-considerations.md): Guidance when updating persisted models.

## Contributing

We welcome contributions! Please check out our [Contributing Guide](documentation/en/contributing.md) for how to get involved.

## Next Steps

Start with the [Usage Overview](documentation/en/usage-overview.md). For Just-In-Time creation and preloading, see the [Advanced Usage Guide](documentation/en/advanced-usage.md). The [Constant](documentation/en/usage-constant.md) and [ObservedDependency](documentation/en/usage-observeddependency.md) guides cover additional features.

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