Swift獲取tableview數組數並將其放置textview

Question

你好我有桌面視圖和解析json和我有textview，我想添加我的tableview項計數到textview，但給我;

fatal error: unexpectedly found nil while unwrapping an Optional value 

錯誤

我這裏

var clientList = [String]() 

let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSArray 

      if let parseJSON = json { 

       self.clientList = parseJSON as! [String] 
       self.clientsmessage.text = "You have \(self.clientList.count) client" 

      } 

Answer 1

代碼看起來你self.clientsmessage不能正常實例，請檢查的一部分。

OR

if self.clientsmessage != nil { 
    self.clientsmessage.text = "You have \(self.clientList.count) client" 
}