iPhone：推送通知后如何删除徽章

iPhone：推送通知后如何删除徽章？

swift
import UIKit
import UserNotifications
// 在合适的地方调用下面的方法来删除徽章
func clearBadge() {
    UIApplication.shared.applicationIconBadgeNumber = 0
    UNUserNotificationCenter.current().removeAllDeliveredNotifications()
}
// 示例：在AppDelegate中处理推送通知
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        
        // 注册推送通知
        UNUserNotificationCenter.current().delegate = self
        UNUserNotificationCenter.current().requestAuthorization(options: [.badge, .sound, .alert]) { (granted, error) in
            if granted {
                DispatchQueue.main.async {
                    application.registerForRemoteNotifications()
                }
            }
        }
        
        return true
    }
    
    // 处理收到的推送通知
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        // 这里处理通知的显示方式
        
        // 删除徽章
        clearBadge()
        
        completionHandler([.alert, .sound])
    }
}