# Add Onesignal to Project
Open Your Flutter Ios Folder in Xcode.
* Create New Target.
* Select Notification Extension and Name It OneSignalNotificationServiceExtension
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* Press `Cancel` on the `Activate Scheme` prompt
* In your project, in the `OneSignalNotificationServiceExtension/` folder, open `NotificationService.m` and replace the whole file contents with:
{% code title="NotificationService.Swift" lineNumbers="true" %}
```swift
import UserNotifications
import OneSignal
class NotificationService: UNNotificationServiceExtension {
var contentHandler: ((UNNotificationContent) -> Void)?
var receivedRequest: UNNotificationRequest!
var bestAttemptContent: UNMutableNotificationContent?
override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
self.receivedRequest = request
self.contentHandler = contentHandler
self.bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
if let bestAttemptContent = bestAttemptContent {
OneSignal.didReceiveNotificationExtensionRequest(self.receivedRequest, with: bestAttemptContent, withContentHandler: self.contentHandler)
}
}
override func serviceExtensionTimeWillExpire() {
if let contentHandler = contentHandler, let bestAttemptContent = bestAttemptContent {
OneSignal.serviceExtensionTimeWillExpireRequest(self.receivedRequest, with: self.bestAttemptContent)
contentHandler(bestAttemptContent)
}
}
}
```
{% endcode %}
* In the main app target, select **Signing & Capabilities** > **All** > **+ Capability**, enable **Push Notifications**.
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* Next, enable **Background Modes** and check **Remote Notifications**.
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