---
title: init()
framework: swiftui
role: symbol
role_heading: Initializer
path: swiftui/app/init()
---

# init()

Creates an instance of the app using the body that you define for its content.

## Declaration

```swift
@MainActor @preconcurrency init()
```

## Discussion

Discussion Swift synthesizes a default initializer for structures that don’t provide one. You typically rely on the default initializer for your app.

## See Also

### Running an app

- [main()](swiftui/app/main().md)