致命錯誤：索引超出范圍

Question

我收到此錯誤：致命錯誤：索引超出范圍。我無法理解我做錯了什么。我想要做的是，使用整數索引訪問數組字典而不是傳遞字符串來獲取值映射到它。示例在操場上運行良好，但不能 excode 為什么？ （數組字典不為空） 這是我的代碼

var CondoIndivi2 = [[String:AnyObject]]()


override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.

    scrollView.contentSize.height = 1500


    print(CondoIndivi2)
    if let description_Condo = self.CondoIndivi2[0]["description"] as? String {

       print(description_Condo)

    }



}




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


 }

這是向 CondoIndivi2 發送數據的視圖

        import UIKit
        import  Alamofire
        import SwiftyJSON

       class SignleCondoTableViewController: UITableViewController {
@IBOutlet var tableview: UITableView!

var singleCondoData =  [[String:AnyObject]]()
var CondoIndivi = [[String:AnyObject]]()

override func viewDidLoad() {
    super.viewDidLoad()

    // Uncomment the following line to preserve selection between  presentations
    // self.clearsSelectionOnViewWillAppear = false

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem()

    self.tableView.delegate = self
    self.tableView.dataSource = self
     }

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

// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int      {
    // #warning Incomplete implementation, return the number of sections
    return 1
     }

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return singleCondoData.count
}


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! SignleTableTableViewCell


    if singleCondoData.count != 0 {


        let dict = singleCondoData[indexPath.row] as NSDictionary


        //cell.label1.text? = (dict["name"] as? String)!

        if let nullcheck = (dict["address"] as? String) {
            cell.label2.text? = nullcheck
        }

    }



    return cell
     }



override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    let dict = singleCondoData[indexPath.row] as NSDictionary


    if let unitNullCheck = (dict["mls_number"] as? String) {
        let item_id = unitNullCheck
        getCondoUnits(item_id)
        print(item_id)

        }



      }

      //get the individual condo id

func getCondoUnits(condo_id : String){


    Alamofire.request(.GET, "http://android.goidx.com/search/?mls_number=" + String(condo_id)).validate().responseJSON { response in

        if let value  = response.result.value {
            let json = JSON(value)

            if let resData = json.arrayObject {

                self.CondoIndivi = resData as! [[String:AnyObject]]

                print(self.CondoIndivi)


            }

            if self.CondoIndivi.count > 0 {

                self.tableview.reloadData()
            }


         }

        }

        }



override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if let identifier = segue.identifier {


        switch identifier  {

        case "details" :


            let buildingdDetailVC = segue.destinationViewController as! DetailsViewController


            buildingdDetailVC.CondoIndivi2  = self.CondoIndivi
         default:
            break
        }

          }

        }







/*
// Override to support conditional editing of the table view.
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    // Return false if you do not want the specified item to be editable.

Answer 1

正如@James 在他的評論中所說，您在代碼中創建了一個空數組：

var CondoIndivi2 = [[String:AnyObject]]()

然后您嘗試訪問位置 0 的索引：

if let description_Condo = self.CondoIndivi2[0]["description"] as? String {
   print(description_Condo)
}

當然，由於您的數組為空，您將有一個Index of out Range的運行時錯誤，您總是需要在索引數組之前確保索引大於零，小於等於數組的大小和數組不為空。

我希望這對你有幫助。

Answer 2

在您的getCondoUnits(condo_id : String)是一個異步塊 ( Alamofire.request )，在執行 viewDidLoad 之后收到CondoIndivi2 。 您應該將condo_id傳遞給下一個 viewController 並在其中執行請求。