Setting a custom icon on an otification

NotificationIconPresenter.swift

struct NotificationIconPresenter {
  func content(from content: UNMutableNotificationContent, iconFileURL: URL) -> UNNotificationContent? {
    guard let icon = INImage(url: iconFileURL) else {
      return nil
    }
    let senderName = Self.senderName(for: content)
    let sender = INPerson(
      personHandle: INPersonHandle(value: senderName, type: .unknown),
      nameComponents: nil,
      displayName: senderName,
      image: icon,
      contactIdentifier: nil,
      customIdentifier: senderName
    )
    let intent = INSendMessageIntent(
      recipients: nil,
      outgoingMessageType: .outgoingMessageText,
      content: nil,
      speakableGroupName: nil,
      conversationIdentifier: Self.conversationIdentifier(for: content),
      serviceName: nil,
      sender: sender,
      attachments: nil
    )
    intent.setImage(icon, forParameterNamed: \INSendMessageIntent.sender)
    return try? content.updating(from: intent)
  }
}