我在我的应用程序中使用 UserNotification 框架并发送本地通知(不是推送通知)，我想将角标(Badge)设置为收到的通知数量，所以我所做的就是设置数量接收到用户默认通知的通知然后我尝试将值分配给角标(Badge)以获得角标(Badge)编号但角标(Badge)编号不会增加。这是我下面的代码

设置接收通知的值

center.getDeliveredNotifications { notification in

    UserDefaults.standard.set(notification.count, forKey: Constants.NOTIFICATION_COUNT)
    print("notification.count \(notification.count)")
    print(".count noti \(UserDefaults.standard.integer(forKey: Constants.NOTIFICATION_COUNT))")

}

这会准确地打印出收到的通知数量，当我决定将其设置为我的角标(Badge)时，它只显示 1

content.badge = NSNumber(value: UserDefaults.standard.integer(forKey: Constants.NOTIFICATION_COUNT))

我不知道为什么这个值每次都没有增加。任何帮助将不胜感激。

或者是否可以始终在应用中的任何位置更新角标(Badge)。

最佳答案

像这样发送本地通知:

func sendNotification(title: String, subtitle: String, body: String, timeInterval: TimeInterval) {
    let center = UNUserNotificationCenter.current()
    center.getPendingNotificationRequests(completionHandler: { pendingNotificationRequests in

        //Use the main thread since we want to access UIApplication.shared.applicationIconBadgeNumber
        DispatchQueue.main.sync {

            //Create the new content
            let content = UNMutableNotificationContent()
            content.title = title
            content.subtitle = subtitle
            content.body = body

            //Let's store the firing date of this notification in content.userInfo
            let firingDate = Date().timeIntervalSince1970 + timeInterval
            content.userInfo = ["timeInterval": firingDate]

            //get the count of pending notification that will be fired earlier than this one
            let earlierNotificationsCount: Int = pendingNotificationRequests.filter { request in

                let userInfo = request.content.userInfo
                if let time = userInfo["timeInterval"] as? Double {
                    if time < firingDate {
                        return true
                    } else {

                        //Here we update the notofication that have been created earlier, BUT have a later firing date
                        let newContent: UNMutableNotificationContent = request.content.mutableCopy() as! UNMutableNotificationContent
                        newContent.badge = (Int(truncating: request.content.badge ?? 0) + 1) as NSNumber
                        let newRequest: UNNotificationRequest =
                            UNNotificationRequest(identifier: request.identifier,
                                                  content: newContent,
                                                  trigger: request.trigger)
                        center.add(newRequest, withCompletionHandler: { (error) in
                            // Handle error
                        })
                        return false
                    }
                }
                return false
            }.count

            //Set the badge
            content.badge =  NSNumber(integerLiteral: UIApplication.shared.applicationIconBadgeNumber + earlierNotificationsCount + 1)
            let trigger = UNTimeIntervalNotificationTrigger(timeInterval: timeInterval,
                                                            repeats: false)

            let requestIdentifier = UUID().uuidString  //You probably want to save these request identifiers if you want to remove the corresponding notifications later
            let request = UNNotificationRequest(identifier: requestIdentifier,
                                                content: content, trigger: trigger)

            center.add(request, withCompletionHandler: { (error) in
                // Handle error
            })
        }
    })
}

(您可能需要保存请求的标识符(如果您想更新它们，可以保存在用户默认值或核心数据中，甚至可以通过 removePendingNotificationRequests(withIdentifiers:) 取消它们)

你可以这样调用上面的函数:

sendNotification(title: "Meeting Reminder",
                 subtitle: "Staff Meeting in 20 minutes",
                 body: "Don't forget to bring coffee.",
                 timeInterval: 10)

将您的 View Controller 声明为 UNUserNotificationCenterDelegate:

class ViewController: UIViewController, UNUserNotificationCenterDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        UNUserNotificationCenter.current().delegate = self
    }
    //...
}

并处理与通知的交互，更新应用程序的角标(Badge)，以及即将到来的通知的角标(Badge):

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

    //UI updates are done in the main thread
    DispatchQueue.main.async {
        UIApplication.shared.applicationIconBadgeNumber -= 1
    }

    let center = UNUserNotificationCenter.current()
    center.getPendingNotificationRequests(completionHandler: {requests in
        //Update only the notifications that have userInfo["timeInterval"] set
        let newRequests: [UNNotificationRequest] =
            requests
                .filter{ rq in
                    return rq.content.userInfo["timeInterval"] is Double?
                }
                .map { request in
                    let newContent: UNMutableNotificationContent = request.content.mutableCopy() as! UNMutableNotificationContent
                    newContent.badge = (Int(truncating: request.content.badge ?? 0) - 1) as NSNumber
                    let newRequest: UNNotificationRequest =
                        UNNotificationRequest(identifier: request.identifier,
                                              content: newContent,
                                              trigger: request.trigger)
                    return newRequest
        }
        newRequests.forEach { center.add($0, withCompletionHandler: { (error) in
            // Handle error
        })
        }
    })
    completionHandler()
}

这会在与通知交互时通过减少它来更新应用角标(Badge)，即点击。此外，它还会更新待处理通知的内容标志。添加具有相同标识符的通知请求只会更新待处理的通知。

要在前台接收通知，并在未与通知交互时增加应用角标(Badge)图标，请执行以下操作:

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    DispatchQueue.main.async {
        UIApplication.shared.applicationIconBadgeNumber += 1
    }
    completionHandler([.alert, .sound])
}

这里有一些动图:

• 1st :接收本地通知会增加应用角标(Badge)。而与通知交互会减少应用角标(Badge)。

• 2nd : 在应用被杀死时接收本地通知(我在这个中使用了 15s 的触发时间间隔)。

• 3rd :在前台接收通知会增加应用角标(Badge)，除非用户与之交互。

我的测试项目中使用的完整类如下所示:

import UIKit
import UserNotifications

class ViewController: UIViewController, UNUserNotificationCenterDelegate {
    var bit = true
    @IBAction func send(_ sender: UIButton) {
        let time: TimeInterval = bit ? 8 : 4
        bit.toggle()
        sendNotification(title: "Meeting Reminder",
                         subtitle: "Staff Meeting in 20 minutes",
                         body: "Don't forget to bring coffee.",
                         timeInterval: time)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        UNUserNotificationCenter.current().delegate = self
    }

    func sendNotification(title: String, subtitle: String, body: String, timeInterval: TimeInterval) {
        let center = UNUserNotificationCenter.current()
        center.getPendingNotificationRequests(completionHandler: { pendingNotificationRequests in
            DispatchQueue.main.sync {
                let content = UNMutableNotificationContent()
                content.title = title
                content.subtitle = subtitle
                content.body = body
                let firingDate = Date().timeIntervalSince1970 + timeInterval
                content.userInfo = ["timeInterval": firingDate]
                let earlierNotificationsCount: Int = pendingNotificationRequests.filter { request in
                    let userInfo = request.content.userInfo
                    if let time = userInfo["timeInterval"] as? Double {
                        if time < firingDate {
                            return true
                        } else {
                            let newContent: UNMutableNotificationContent = request.content.mutableCopy() as! UNMutableNotificationContent
                            newContent.badge = (Int(truncating: request.content.badge ?? 0) + 1) as NSNumber
                            let newRequest: UNNotificationRequest =
                                UNNotificationRequest(identifier: request.identifier,
                                                      content: newContent,
                                                      trigger: request.trigger)
                            center.add(newRequest, withCompletionHandler: { (error) in
                                // Handle error
                            })
                            return false
                        }
                    }
                    return false
                    }.count
                content.badge =  NSNumber(integerLiteral: UIApplication.shared.applicationIconBadgeNumber + earlierNotificationsCount + 1)
                let trigger = UNTimeIntervalNotificationTrigger(timeInterval: timeInterval,
                                                                repeats: false)

                let requestIdentifier = UUID().uuidString  //You probably want to save these request identifiers if you want to remove the corresponding notifications later
                let request = UNNotificationRequest(identifier: requestIdentifier,
                                                    content: content, trigger: trigger)

                center.add(request, withCompletionHandler: { (error) in
                    // Handle error
                })
            }
        })
    }

    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        DispatchQueue.main.async {
            UIApplication.shared.applicationIconBadgeNumber += 1
        }
        completionHandler([.alert, .sound])
    }

    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        DispatchQueue.main.async {
            UIApplication.shared.applicationIconBadgeNumber -= 1
        }

        let center = UNUserNotificationCenter.current()
        center.getPendingNotificationRequests(completionHandler: {requests in
            let newRequests: [UNNotificationRequest] =
                requests
                    .filter{ rq in
                        return rq.content.userInfo["timeInterval"] is Double? 
                    }
                    .map { request in
                        let newContent: UNMutableNotificationContent = request.content.mutableCopy() as! UNMutableNotificationContent
                        newContent.badge = (Int(truncating: request.content.badge ?? 0) - 1) as NSNumber
                        let newRequest: UNNotificationRequest =
                            UNNotificationRequest(identifier: request.identifier,
                                              content: newContent,
                                              trigger: request.trigger)
                        return newRequest
            }
            newRequests.forEach { center.add($0, withCompletionHandler: { (error) in
                // Handle error
            })
            }
        })
        completionHandler()
    }
}

关于ios - Usernotification 框架角标(Badge)不增加，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52323684/