使用Grand Central Dispatch时如何发布NSNotification？

import Foundation

let customNotificationName = Notification.Name("CustomNotification")

DispatchQueue.global(qos: .background).async {
    // 在后台执行一些任务

    // 将通知发布到主队列
    DispatchQueue.main.async {
        NotificationCenter.default.post(name: customNotificationName, object: nil)
    }
}

NotificationCenter.default.addObserver(self, selector: #selector(notificationReceived), name: customNotificationName, object: nil)

@objc func notificationReceived() {
    // 在这里处理通知
}

deinit {
    NotificationCenter.default.removeObserver(self, name: customNotificationName, object: nil)
}