Firebase 推送通知徽章计数是否会在 iOS 中自动增加？

Question

I am getting remote push-notification from firebase. I am trying to get badge count in app icon. In Firebase there is option to give badge count as bellow

As for now i dont have device to test. My question is if i put 1 as badge count every-time will it increment badge count automatically on app icon? if no then how to increment it using firebase.

Answer 1

You want to use UserDefaults to keep track of the amount of notifications that come in

1- first register the badge count to UserDefaults with a value of 0 . I usually register on Login Screen in viewDidLoad with whatever other values that I need to register

var dict = [String: Any]()
dict.updateValue(0, forKey: "badgeCount")
UserDefaults.standard.register(defaults: dict)

2- when your notification comes in from Firebase to your app, update the "badgeCount" . Here is an example when the notification comes in to AppDelegate :

// this is inside AppDelegate
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

    // A. get the dict info from the notification
    let userInfo = notification.request.content.userInfo

    // B. safely unwrap it 
    guard let userInfoDict = userInfo as? [String: Any] else { return }

    // C. in this example a message notification came through. At this point I'm not doing anything with the message, I just want to make sure that it exists
    guard let _ = userInfoDict["message"] as? String else { return }

    // D. access the "badgeCount" from UserDefaults that you registered in step 1 above
    if var badgeCount = UserDefaults.standard.value(forKey: "badgeCount") as? Int {

        // E. increase the badgeCount by 1 since one notification came through
        badgeCount += 1

        // F. update UserDefaults with the updated badgeCount
        UserDefaults.standard.setValue(badgeCount, forKey: "badgeCount")

        // G. update the application with the current badgeCount so that it will appear on the app icon
        UIApplication.shared.applicationIconBadgeNumber = badgeCount
    }
}

3- whatever logic in whichever vc that you use to acknowledge when the user has viewed the notification, reset UserDefaults' badgeCount back to zero. Also set the UIApplication.shared.applicationIconBadgeNumber to zero

SomeVC:

func resetBadgeCount() {

    // A. reset userDefaults badge counter to 0
    UserDefaults.standard.setValue(0, forKey: "badgeCount")

    // B. reset this back to 0 too
    UIApplication.shared.applicationIconBadgeNumber = 0
}

Information for UIApplication.shared.applicationIconBadgeNumber