---
title: "init(editing:contentType:editor:prepareDocument:)"
framework: swiftui
role: symbol
role_heading: Initializer
path: "swiftui/documentgroup/init(editing:contenttype:editor:preparedocument:)"
---

# init(editing:contentType:editor:prepareDocument:)

Instantiates a document group for creating and editing documents that store a specific model type.

## Declaration

```swift
nonisolated init(editing modelType: any PersistentModel.Type, contentType: UTType, editor: @escaping () -> Content, prepareDocument: @escaping (ModelContext) -> Void = { _ in })
```

## Parameters

- `modelType`: The model type defining the schema used for each document.
- `contentType`: The content type of the document. It should conform to UTType.package.
- `editor`: The editing UI for the provided document.
- `prepareDocument`: The optional closure that accepts ModelContext associated with the new document. Use this closure to set the document’s initial contents before it is displayed: insert preconfigured models in the provided ModelContext.

## Discussion

Discussion  @main  struct Todo: App {      var body: some Scene {          DocumentGroup(editing: TodoItem.self, contentType: .todoItem) {              ContentView()          }      }  }

struct ContentView: View {      @Query var items: [TodoItem]

var body: some View {              List {                  ForEach(items) { item in                      @Bindable var item = item                      Toggle(item.text, isOn: $item.isDone)                  }               }          }  }

@Model  final class TodoItem {      var created: Date      var text: String      var isDone = false  }

extension UTType {      static var todoItem = UTType(exportedAs: "com.myApp.todoItem")  } important: If your app declares custom uniform type identifiers, include corresponding entries in the app’s Info.plist. For more information, see Defining file and data types for your app. Also, remember to specify the supported Document types in the Info.plist as well.

## See Also

### Editing a document backed by a persistent store

- [init(editing:migrationPlan:editor:prepareDocument:)](swiftui/documentgroup/init(editing:migrationplan:editor:preparedocument:).md)