使用NotificationCenter在表视图中设置标签的值

let notificationCenter = NotificationCenter.default
notificationCenter.addObserver(self, selector: #selector(updateLabel(_:)), name: NSNotification.Name("UpdateLabelNotification"), object: nil)

let labelValue = "Hello, World!"
notificationCenter.post(name: NSNotification.Name("UpdateLabelNotification"), object: nil, userInfo: ["labelValue": labelValue])

@objc func updateLabel(_ notification: Notification) {
    if let userInfo = notification.userInfo,
       let labelValue = userInfo["labelValue"] as? String {
        // 更新标签的值
        label.text = labelValue
    }
}