EXC_BAD_INSTRUCTION（コード= EXC_1386_INBOP、サブコード= 0x0の

Question

私はSQLテーブルからデータを取得しようとしています。

コードの最初のスニペットで、私は正しい出力で

private func loadAllEmployees(){ 
    //URL: 
    let URL_GET_EMPLOYEES:String = "URL_HERE" 

    //created NSURL 
    let requestURL = NSURL(string: URL_GET_EMPLOYEES) 

    //creating NSMutableURLRequest 
    let request = NSMutableURLRequest(url: requestURL! as URL) 

    //setting the method to post 
    request.httpMethod = "GET" 

    //creating a task to send the post request 
    let task = URLSession.shared.dataTask(with: request as URLRequest){ 
     data, response, error in 

     //exiting if there is some error 
     if error != nil{ 
      print("error is \(error)") 
      return; 
     } 

     //parsing the response 
     do { 
      //converting resonse to NSDictionary 
      var employeeJSON: NSDictionary! 
      employeeJSON = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary 

      //getting the JSON array teams from the response 
      let employees: NSArray = employeeJSON["employees"] as! NSArray 

      //looping through all the json objects in the array teams 
      let endOfArray = employees.count 

      for i in 0 ..< endOfArray{ 
       //getting the data at each index 
       let userName = (employees[IndexPath.Element.init(i)] as? [String : String])? ["userName"] 

       //displaying the data 
       print("Username is: ", userName!) 
      } 
     } catch { 
      print(error) 
     } 
    } 

    //executing the task 
    task.resume() 
} 

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    loadAllEmployees() 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 

をこれを行うことができますよ2番目のスニペットでは、同じコードであっても、エラーEXC_BAD_INSTRUCTION(code=EXC_1386_INBOP, subcode=0x0の行print("Username is: ", itemName!)に出くわします。

この問題の原因は、「itemName」がnilであると考えているためです。 SQLの小道具エリー。

private func loadAllStock(){ 
    //URL: 
    let URL_GET_STOCK:String = "URL_HERE" 

     //created NSURL 
     let requestURL = NSURL(string: URL_GET_STOCK) 

     //creating NSMutableURLRequest 
     let request = NSMutableURLRequest(url: requestURL! as URL) 

     //setting the method to post 
     request.httpMethod = "GET" 

     //creating a task to send the post request 
     let task = URLSession.shared.dataTask(with: request as URLRequest){ 
      data, response, error in 

      //exiting if there is some error 
      if error != nil{ 
       print("error is \(error)") 
       return; 
      } 

      //parsing the response 
      do { 
       //converting resonse to NSDictionary 
       var stockJSON: NSDictionary! 
       stockJSON = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary 

       //getting the JSON array teams from the response 
       let stocks: NSArray = stockJSON["stocks"] as! NSArray 

       //looping through all the json objects in the array teams 
       let endOfArray = stocks.count 

       for i in 0 ..< endOfArray{ 
        //getting the data at each index 
        let itemName = (stocks[IndexPath.Element.init(i)] as? [String : String])? ["itemName"] 

        //displaying the data 
        print("ItemName is: ", itemName!) 
        print("===================") 
        print("") 
       } 
      } catch { 
       print(error) 
      } 
     } 

     //executing the task 
     task.resume() 
} 

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    loadAllStock() 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 

Answer 1

私はuserNameがnilある場合userName!がクラッシュすると思います。 printの前にnilを確認する必要があります。 "（と株式[IndexPath.Element.init（I）] [文字列：文字列]？）しましょうitemNameに=？

：回答について

Answer 2

おかげで、私はラインを変更し、[" itemNameに "]"

へ：

"itemNameに=（株[IndexPath.Element.init（I）]のように[文字列：任意]？）しましょう？[" itemNameに "]"

とやるように見えました仕事