表視圖細胞被複制後，回來在迅速

Question

import UIKit 

這裏的另一頁是我的數組列表

var postIdArray :[String] = [] 
    var adminIdArray :[String] = [] 
    var titleArray :[String] = [] 
    var descriptionArray :[String] = [] 
    var ImageArray :[String] = [] 
    var postDate :[String] = [] 
    var myIndex = 0 

    class News__Latest_News_: BaseViewController, UITableViewDelegate, UITableViewDataSource { 
     @IBOutlet var tabelView: UITableView! 
     final let urlString = "http://iccukapp.org/Api_json_format/" 

     override func viewDidLoad() { 
      super.viewDidLoad() 
      self.downloadJsonWithURL() 
     } 

這裏我下載JSON

 func downloadJsonWithURL() { 

      let url = NSURL(string: urlString) 
      URLSession.shared.dataTask(with: (url as URL?)!, completionHandler: {(data, response, error) -> Void in 

       if let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? NSDictionary { 
        print(jsonObj!.value(forKey: "result") as Any) 

        if let ListArray = jsonObj!.value(forKey: "result") as? NSArray { 
         for eList in ListArray{ 
          if let eventIDD = eList as? NSDictionary { 
          if let name = eventIDD.value(forKey: "post_id") { 
            postIdArray.append(name as! String) 
           } 
         if let name = eventIDD.value(forKey: "admin_id") { 
            adminIdArray.append(name as! String) 
           } 
         if let name = eventIDD.value(forKey: "title") { 
            titleArray.append(name as! String) 
           } 
         if let name = eventIDD.value(forKey: "description") { 
            descriptionArray.append(name as! String) 
           } 
         if let name = eventIDD.value(forKey: "post_iamge") { 
            ImageArray.append(name as! String) 
           } 
        if let name = eventIDD.value(forKey: "post_created") { 
            postDate.append(name as! String) 
           } 


          } 
         } 
        } 

        OperationQueue.main.addOperation({ 
         self.tabelView.reloadData() 


        }) 
       } 
      }).resume() 
     } 

在這裏，我配置的TableView

 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
      return postIdArray.count 
     } 

**下面是表視圖小區配置**

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 

      let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! NewsTableViewCell 

      cell.nameLabel.text = titleArray[indexPath.row] 
      let alinkurl = "http://iccukapp.org/assets/admin/images/" 

      let imagUrl = NSURL(string: "\(alinkurl)" + ImageArray[indexPath.row]) 


      let qos = DispatchQoS(qosClass: .background, relativePriority: 0) 
      let backgroundQueue = DispatchQueue.global(qos: qos.qosClass) 
      backgroundQueue.async { 
       if imagUrl != nil { 
        let data = NSData(contentsOf: (imagUrl as URL?)!) 
        cell.imageLabel.image = UIImage(data: data! as Data) 

       } 

      } 

      return cell 

     } 

本功能爲執行Segue公司

 func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 
      myIndex = indexPath.row 
      performSegue(withIdentifier: "newsId", sender: self) 


     } 

    } 

後運行應用程序第一次表視圖顯示正確的內容。但是，當我轉到其他頁面並返回到此頁面時，它會複製所有內容。 高級感謝

Answer 1

我懷疑FUNC downloadJsonWithURL（）被調用兩次，因爲這將數據追加到數組用於填充表，你會看到重複

嘗試設置：

self.postIdArray = [] 
self.adminIdArray = [] 
self.titleArray = [] 
self.descriptionArray = [] 
self.ImageArray = [] 
self.postDate = [] 

在func downloadJsonWithURL（）的開頭設置空數組，然後再附加JSON調用的結果