---
title: NFCWindowSceneEvent
framework: corenfc
role: symbol
role_heading: Enumeration
path: corenfc/nfcwindowsceneevent
---

# NFCWindowSceneEvent

An NFC-related event that your app uses to update its user interface.

## Declaration

```swift
enum NFCWindowSceneEvent
```

## Overview

Overview When the device is eligible to receive NFC-related events, this type indicates the type of received event. The event may indicate the presence of an NFC reader or a gesture by the person using the app to initiate a contactless transaction. NFCWindowSceneEvent represents these as the NFCWindowSceneEvent.readerDetected and NFCWindowSceneEvent.presentation cases, respectively. You can receive this event in two scenarios: When the system calls UISceneDelegate method scene(_:willConnectTo:options:), the system created a new scene in response to the event. In this case, check the connectionOptions parameter for the presence of the nfcEvent member, which is an instance of NFCWindowSceneEvent. When the system calls the NFCWindowSceneDelegate method windowScene(_:didReceiveNFCWindowSceneEvent:), the system delivered the event to an existing scene. In either case, store the event and use it to update the UI for an NFC interaction. The following example shows a scene delegate that handles both scenarios, using a ViewModel class to store the event for use by an appropriate view: import UIKit import SwiftUI import CoreNFC

class SceneDelegate: UIResponder, UIWindowSceneDelegate, NFCWindowSceneDelegate {

var window: UIWindow?     var myViewModel = ViewModel()

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {         guard let windowScene = (scene as? UIWindowScene) else { return }                  // Check the connection options to see if the scene is being created         // in response to an NFC event.         guard let nfcEvent = connectionOptions.nfcEvent  else { return }         // If there's an event, update the view model.         myViewModel.receivedNFCEvent = nfcEvent

// Update the view hierarchy by using myViewModel to create a new         // view.     }

func windowScene(_ windowScene: UIWindowScene, didReceiveNFCWindowSceneEvent event: NFCWindowSceneEvent) {         // Update the view model with the NFC event.         myViewModel.receivedNFCEvent = event         // Update the view hierarchy by using myViewModel to create a new         // view.      } }

## Topics

### Events

- [NFCWindowSceneEvent.readerDetected](corenfc/nfcwindowsceneevent/readerdetected.md)
- [NFCWindowSceneEvent.presentation](corenfc/nfcwindowsceneevent/presentation.md)

## Relationships

### Conforms To

- [CustomStringConvertible](swift/customstringconvertible.md)
- [Decodable](swift/decodable.md)
- [Encodable](swift/encodable.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)

## See Also

### NFC window scenes

- [NFCWindowSceneDelegate](corenfc/nfcwindowscenedelegate.md)