徽章编号在UITabBarController

Question

我有两个选项卡的通知徽章，位于UITabBarController的1位置和2位置。 1号位置的徽章显示正常，即使应用程序处于打开状态，它也会显示新的徽章编号。但是，2位置标签显示一次，当应用程序打开或甚至关闭时，它不会显示新的徽章编号。它只会在几小时不活动后显示徽章编号。这会是我的代码问题还是我后端的问题？ 1位是请求通知，2位是聊天消息。

class NewTabBarViewController: UITabBarController {


var numPendingRequests = 0
var numUnseenConversations = 0

override func viewDidLoad() {
    super.viewDidLoad()
    observeNumPendingRequests()
    observeNumUnseenConversations()
    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    sendFCMToken()
    observeNumPendingRequests()
    observeNumUnseenConversations()
    AuthService().getCurrentUserInfo()
    // Show notification center if the app launched from a notification
    // Typically from the background or killed app state
    if NotificationService.launchedFromNotification {
        showNotificationCenter()
        NotificationService.launchedFromNotification = false
    }

    // Observe if the app is opened from a notification
    // Typically from the foreground state
    NotificationCenter.default.addObserver(self, selector: #selector(showNotificationCenter), name: NotificationService.didLaunchFromNotification, object: nil)

}

override func viewDidDisappear(_ animated: Bool) {
    super.viewDidDisappear(animated)

    // Stop observing if the app is opened from a notification
    NotificationCenter.default.removeObserver(self, name: NotificationService.didLaunchFromNotification, object: nil)
}

// Select the tab item with the notification center
@objc func showNotificationCenter() {
    self.selectedIndex = 2
}

/**
 Sends the users private Firebase Cloud Messaging Token to the database
 to be used by the Cloud Functions for sending Push Notifications

 */
func sendFCMToken() {
    guard let token = Messaging.messaging().fcmToken, let user = Auth.auth().currentUser else { return }
    let db = Database.database().reference()
    let ref = db.child("FCMToken/\(user.uid)")
    ref.setValue(token)
}

/**
 Observes the number of received requests that are PENDING
 and updates the App Badge Icon Number and tabBar Item accordingly

 */
func observeNumPendingRequests() {
    guard let user = Auth.auth().currentUser else { return }
    let db = Database.database().reference()
    let ref = db.child("receivedRequests/\(user.uid)").queryOrderedByValue().queryEqual(toValue: "PENDING")
    ref.observe(.value, with: { snapshot in
        self.numPendingRequests = Int(snapshot.childrenCount)
        self.setApplicationBadgeCount()
    })
}

func observeNumUnseenConversations() {
    guard let user = Auth.auth().currentUser else { return }
    let db = Database.database().reference()
    let ref = db.child("conversations/users/\(user.uid)").queryOrdered(byChild: "seen").queryEqual(toValue: false)
    ref.observe(.value, with: { snapshot in
        self.numUnseenConversations = Int(snapshot.childrenCount)

        self.setApplicationBadgeCount()
    })
}

func setApplicationBadgeCount() {
    let total = numUnseenConversations + numPendingRequests
    UIApplication.shared.applicationIconBadgeNumber = Int(total)
    self.tabBar.items?[1].badgeValue = numPendingRequests > 0 ? "\(numPendingRequests)" : nil
    self.tabBar.items?[2].badgeValue = numUnseenConversations > 0 ? "\(numUnseenConversations)" : nil
}


 }

Answer 1

实际上是否会返回一些看不见的对话？如果是nil，则不会有徽章。仔细检查一下，甚至尝试将其设置为硬编码字符串，以进行快速而肮脏的测试。此外，当您尝试在标签2上查看更新的徽章时，您是否在标签1上？选择该选项卡后，尝试更改选项卡2徽章。您可能还需要确保self.tabBar.items?[2]不是nil。