如何在Swift 3中的另一个闭包内设置UIButton的isSelected属性

Question

用户接受AlertController的设置通知后，如果添加通知请求成功完成，则必须在所选的TableViewCell内设置UIButton。但即使代码到达那里，它也没有回应。我认为问题在于，Handler事件的关闭与主函数的关闭不同，并且因为它在处理程序事件关闭内不能正确获取UIButton对象。我该如何解决这个问题？这是代码片。

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) 
{ 
    var isAlarmSet=false 
    let center = UNUserNotificationCenter.current() 
    tableView.deselectRow(at: indexPath, animated: true) 

    if let alarmButton = tableView.cellForRow(at: indexPath) as? BroadcastViewCell{ 
     var row=indexPath.row 
     isAlarmSet = alarmButton.notifyButton.isSelected 
     self.alarmButton=alarmButton.notifyButton 
     if !isAlarmSet 
     { 
      //Calculating the date variable for notification time in this section i dont put it in here because it is too long. 

       if (date?.timeIntervalSinceNow.sign == .minus) 
       { 
        let alertController=UIAlertController(title:"UYARI" , message: "Programın süresi geçmiştir.", preferredStyle: .alert) 
        let cancelAction = UIAlertAction(title: "Tamam", style: .cancel) { (action:UIAlertAction!) in 

        } 
        alertController.addAction(cancelAction) 
        self.present(alertController, animated: true, completion: nil) 

       } 
       else 
       { 
        let alertController=UIAlertController(title:show.programName , message: "Program başlamadan 10 dakika önce uyarı alacaksınız.", preferredStyle: .alert) 
        let cancelAction = UIAlertAction(title: "İptal", style: .cancel) { (action:UIAlertAction!) in 

        } 
        let acceptAction=UIAlertAction(title: "Tamam" , style: .default, handler: { (action:UIAlertAction) in 

         if #available(iOS 10.0, *) 
         { 
          let components = Calendar.current.dateComponents([.weekday, .hour, .minute], from: date!) 

          let trigger = UNCalendarNotificationTrigger(dateMatching: components, repeats: false) 

          //Set the request for the notification from the above 
          let request = UNNotificationRequest(
           identifier: (show.airDate)!+(show.airTime)!, 
           content: content, 
           trigger: trigger 
          ) 

          UNUserNotificationCenter.current().add(request) 
          { (error:Error?) in 
           if error != nil 
           { 
            print(error?.localizedDescription) 
            return 
           } 
           print("Notification Register Success") 
           alarmButton.notifyButton.isSelected=true 
           UNUserNotificationCenter.current().getPendingNotificationRequests 
           { (requests) in 
             self.notifications=requests 
           } 

          } 
         } 

        alertController.addAction(cancelAction) 
        alertController.addAction(acceptAction) 
        self.present(alertController, animated: true, completion: nil) 
       } 

      } 
     } 
    } 

} 

Answer 1

UI可以更新仅在主线程上，然后用

DispatchQueue.main.async { 
    alarmButton.notifyButton.isSelected=true 
}