2017-05-26 62 views
0

我在我的父類中定義了一個全局數組,我試圖從JSON文件中調用REST服務GET服務GET填充對象。我的想法是,我定義了全局數組,並填充從JSON文件填充的對象,然後將在我的內部類中使用這些數據。但我注意到數據被填滿了,它正確地得到了數據,數據被輸入到了數組中,但是一切都在方法之外被刪除了。在內部類中,數據不存在,甚至不在網絡請求範圍內。我無法想象問題是什麼。數據從全局數組中消失

這裏是我的數組的初始化的全局數組:

class ContentDeliveryViewController: UITableViewController, UISearchBarDelegate, UISearchDisplayDelegate{ 

public var ListOfFiles: [Asset_Content] = [] 
public var ListOfTags: [String] = [] 

這裏是獲取JSON和與這表明括號外的列入報表打印的陣列填充方法該陣列已空。

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 
    print("short CALLED") 
    let cell = self.tableView.dequeueReusableCell(withIdentifier: "ContentDeliveryCell", for: indexPath as IndexPath) as! ContentDeliveryCell 

    var content: AWSContent 
    //fix this 
    if(tableView == self.searchDisplayController?.searchResultsTableView){ 
     print("search part called!!") 
     content = filteredList[indexPath.row] 
    }else{ 
     content = contents![indexPath.row] 
    } 

    if(content.key.contains(IDENTIFIER)){ 
     // 
     let url = URL(string: URL) 
     let task = URLSession.shared.dataTask(with: url!){ 
      data, response, error in guard error == nil else{ 
       print(error!) 
       return 
      } 
      guard let data = data else{ 
       print("Data is empty") 
       return 
      } 
      let json = try! JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? [[String: AnyObject]] 
      var asset: Asset_Content 
      for jay in json! { 
       let category = jay["BIGCATEGORY"] as? String 
       let diagnosis = jay["DIAGNOSIS"] as? String 
       let perspective = jay["PERSPECTIVE"] as? String 
       let name = jay["NAME"] as? String 
       let title = jay["Title"] as? String 
       let UnparsedTags = jay["TAGS"] as? String 
       let filename = jay["FILENAME"] as? String 

       let tagArray = UnparsedTags?.characters.split(separator: ",") 
       for tag in tagArray!{ 
        if(self.ListOfTags.contains(String(tag))){ 

        }else{ 
         self.ListOfTags.append(String(tag)) 
         print("TAGCOUNT == ", self.ListOfTags.count) 
        } 
       } 

       asset = Asset_Content(category!, diagnosis!, perspective!, name!, title!, filename!) 
       self.loadJson(forFile: asset) 
       print("RightCount === ", self.ListOfFiles.count)// FILLED ARRAY 
      } 
      print("FirstCount === ", self.ListOfFiles.count)//FILLED ARRAY 
     } 

     task.resume() 
     cell.isHidden = true 
     print("FirstCount === ", self.ListOfFiles.count)// EMPTY ARRAY 
     print("TAGCOUNT == ", self.ListOfTags.count) // EMPTY ARRAY 
     return cell 
    }else{ 
     cell.prefix = prefix 
     cell.content = content 
     print("KEY" ,content.key) 
     cell.isHidden = false 
     return cell 
    } 
} 
+3

'cellForRowAt'是錯誤的地方下載和pa rse JSON。你的數組是空的,因爲'dataTask'異步工作。 – vadian

+0

如何在完成數據後加載數據? –

回答

0

正確方法:

  1. 負載數據
  2. 解析JSON到對象
  3. commit對象細胞(由例如:cell.object = ...),並讓細胞本身配置
  4. 刷新表格視圖