EducaSwift

You can add additional data to notifications, enabling actions tailored to each specific notification.

Place your custom fields at the root level of the remote notification JSON.

{
    "aps": {
        "alert": {
            "title": "EducaSwift",
            "subtitle": "Remote Notifications",
            "body": "This is a Remote Push Notification test.",
        },
        "badge": 12
    },
    "custom_field": "1",
    "another_custom_field": "2"
}

For local notifications, you can add this info to the content:

let content = UNMutableNotificationContent()
content.title = "EducaSwift"
content.body = "This is a Local Push Notification test."
content.userInfo = [
    "custom_field": 1,
    "another_custom_field": 2
]

On both cases, when a notification is tapped we can read those custom fields:

@MainActor
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse) async {
    let userInfo = response.notification.request.content.userInfo

    print(userInfo["custom_field"])
    print(userInfo["another_custom_field"])
}

Using Decodable protocol

You can pass nested JSON parameters and decode them using JSONDecoder().

{
    "aps": {
        "alert": {
            "title": "EducaSwift",
            "subtitle": "Remote Notifications",
            "body": "This is a Remote Push Notification test.",
        },
        "badge": 12
    },
    "user": {
        "id": 1,
        "name": "pablo"
    }
}

struct User: Decodable {
    let id: Int
    let name: String
}

@MainActor
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse) async {
    let userInfo = response.notification.request.content.userInfo

    if let userDictionary = userInfo["user"],
       let userData = try? JSONSerialization.data(withJSONObject: userDictionary),
       let user = try? JSONDecoder().decode(User.self, from: userData)
    {
        print(user.id)
        print(user.name)
    }
}