警告時UIAlertController：0x7ff211650140斯威夫特

Question

稱爲調用UIAlert

當試圖同時它 解除分配不允許加載視圖控制器的觀點，並可能導致不確定的行爲 （我得到這樣的警告有時）

code used: 

    func alert (dictKey: String){ 
     print(dictKey) 
     let alertController = UIAlertController(title: nil, message: promptsArr[dictKey], preferredStyle: .Alert) 
     let OKAction = UIAlertAction(title: "OK", style: .Default) { (action) in 

     } 
     alertController.addAction(OKAction) 
     if self.presentedViewController == nil { 
      delay(1.0){ 
       self.presentViewController(alertController, animated: true, completion: nil) 
      } 
     } else { 
      self.presentedViewController! 
     } 

Answer 1

1. 刪除delay()

2. 把邏輯裏面self.presentedViewController： （無需創建警報如果存在的話）

   func alert (dictKey: String){ 
       if self.presentedViewController == nil { 
        let alertController = UIAlertController(
         title: nil, 
         message: promptsArr[dictKey], 
         preferredStyle: .Alert) 
        let OKAction = UIAlertAction(title: "OK", style: .Default) { 
         (action) in 
        } 
        alertController.addAction(OKAction) 
   
        self.presentViewController(
         alertController, 
         animated: true, 
         completion: nil) 
       } 
   }