新的Xcode和Swift。我的应用程序有一个倒计时器。我希望倒计时作为一个通知从锁屏可见，但我不知道如何（如果它甚至可能）更新现有的本地通知的内容。
到目前为止，我找到的唯一解决方案是取消当前通知，每秒显示一个新通知，这并不理想。
代码：

struct TimerApp: View {
    private let timer = Timer.publish(every: 1, on: .main, in: .common).autoconnect() 
    @State private var isActive: Bool = true    // whether not timer is active 
    @State private var timeRemaining: Int = 600     // 60 seconds * 10 mins = 10 min-countdown timer

    var body: some View {
        // body stuff
        // toggle isActive if user stops/starts timer

    }.onReceive(timer, perform: { _ in 
        guard isActive else { return }

        if timeRemaining > 0 { 
            // would like to update current notification here
            // *******

            // instead, removing and adding a new one right now
            UNUserNotificationCenter.current().removeAllDeliveredNotifications()
            UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
            addNotification()
 
            timeRemaining -= 1
        } else {
            isActive = false
            timeRemaining = 0
        }
    }

    func addNotification() {
        
        let center = UNUserNotificationCenter.current()

        let addRequest = {
            let content = UNMutableNotificationContent()
            content.title = "App Title"
            content.body = "Time: \(timeFormatted())"
            let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 0.0001, repeats: false)

            let request = UNNotificationRequest(identifier: "onlyNotification", content: content, trigger: trigger)
            center.add(request)            
            
        }
        
        center.getNotificationSettings { settings in
            if settings.authorizationStatus == .authorized {
                addRequest()
            } else {
                center.requestAuthorization(options: [.alert, .badge]) { success, error in
                    if success {
                        addRequest()
                    } else if let error = error {
                        print("error :( \(error.localizedDescription)")
                    }
                }
            }
        }
    }

    func timeFormatted() -> String {
        // converts timeRemaining to 00:00 format and returns string
    }
}

这就是现在这个可笑的糟糕解决方案。