在Swift中更改通知声音

import UserNotifications

UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in
    if granted {
        // 用户已授权
    } else {
        // 用户未授权
    }
}

import UserNotifications

let content = UNMutableNotificationContent()
content.title = "通知标题"
content.body = "通知内容"
content.sound = UNNotificationSound.default // 更改通知声音

let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false)

let request = UNNotificationRequest(identifier: "NotificationIdentifier", content: content, trigger: trigger)

UNUserNotificationCenter.current().add(request) { (error) in
    if let error = error {
        print("添加通知失败：\(error.localizedDescription)")
    } else {
        print("添加通知成功")
    }
}

import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // 注册通知中心
        UNUserNotificationCenter.current().delegate = self
        return true
    }

    // 实现通知中心代理方法
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        // 在前台运行时也显示通知
        completionHandler([.alert, .sound, .badge])
    }
}