iOS swift 5: 在 Thread中 要呼叫另一個畫面

iOS swift 5: Thread And self.present

 解決方案來源:
   Xcode 9 的 Main Thread Checker

簡單的說如果在 Thread中 要呼叫另一個畫面
要使用 DispatchQueue.main.async 方法

Main Thread Checker: UI API called on a background thread: -[UIButton setImage:forState:]
PID: 1284, TID: 896227, Thread name: (none), Queue name: com.apple.root.default-qos.overcommit, QoS: 0

  DispatchQueue.main.async
  {
   let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
   let ShowVc = storyBoard.instantiateViewController(withIdentifier: "ShowVcId") as! TShowVc
   ShowVc.TitleStr = Title 
   self.present( ShowVc, animated: true, completion: nil)
  }