Why alamofire downloads progress in alert will flashing and the behind screen starts to be fade to black?
问题 I have progress view in alert when downloading with alamofire, but the problem is that when I want to download the progress view in alert will start to be complete but flashing and the other problem is that the behind screen will start to be fade to black I think in every second a new alert with progress view will show and at the end there are lots of alerts how can I avoid them? downloadTimer = Timer.scheduledTimer(timeInterval: 1 , target: self, selector: #selector(flashingDownload),