---
title: "init(_:)"
framework: swiftui
role: symbol
role_heading: Initializer
path: "swiftui/nsapplicationdelegateadaptor/init(_:)-1dott"
---

# init(_:)

Creates an AppKit app delegate adaptor using a delegate that’s an observable object.

## Declaration

```swift
@MainActor @preconcurrency init(_ delegateType: DelegateType.Type = DelegateType.self)
```

## Parameters

- `delegateType`: The type of application delegate that you define in your app, which conforms to the doc://com.apple.documentation/documentation/AppKit/NSApplicationDelegate and doc://com.apple.documentation/documentation/Combine/ObservableObject protocols.

## Discussion

Discussion Call this initializer indirectly by creating a property with the NSApplicationDelegateAdaptor property wrapper from inside your App declaration: @main struct MyApp: App {     @NSApplicationDelegateAdaptor private var appDelegate: MyAppDelegate

var body: some Scene { ... } } SwiftUI initializes the delegate and manages its lifetime, calling it as needed to handle application delegate callbacks. SwiftUI invokes this method when your app delegate conforms to the ObservableObject protocol. In this case, SwiftUI automatically places the delegate in the Environment. You can access such a delegate from any scene or view in your app using the EnvironmentObject property wrapper: @EnvironmentObject private var appDelegate: MyAppDelegate If your delegate isn’t an observable object, SwiftUI invokes the init(_:) initializer rather than this one, and doesn’t put the delegate instance in the environment.