检索从细胞的图像使用斯威夫特

Question

我有一个自定义的UITableViewCell在那里我先下载它作为填充的图像上FB/Twitter上分享如下

let url = NSURL(string: imageurl1[indexPath.row]) 

       let task = NSURLSession.sharedSession().dataTaskWithURL(url!) { (data, response, error) in 

        if error != nil 
        { 
         // 
        } 
        else 
        { 
         dispatch_async(dispatch_get_main_queue(), { 

          if let image = UIImage(data: data!) { 

           cell.postedImage.image = image 
          } 

         }) 

        } 


       } 
       task.resume() 

这里的的cellForRowAtIndexPath

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> 
    UITableViewCell{ 

     var cell = UITableViewCell() 

     let cell = tableView.dequeueReusableCellWithIdentifier("feed1", forIndexPath: indexPath) as! feed 

      cell.delegate = self 

      if imageurl1[indexPath.row].isEmpty { 

       cell.postedImage.image = UIImage(named: "no_image.jpg") 

      } 
      else 
      { 

       let url = NSURL(string: imageurl1[indexPath.row]) 

       let task = NSURLSession.sharedSession().dataTaskWithURL(url!) { (data, response, error) in 

        if error != nil 
        { 
         cell.postedImage.image = UIImage(named: "no_image.jpg") 
               } 
        else 
        { 
         dispatch_async(dispatch_get_main_queue(), { 

          if let image = UIImage(data: data!) { 

           cell.postedImage.image = image 

          } 

         }) 

        } 


       } 
       task.resume() 



      } 
      cell.username.text = username1[indexPath.row] 
      **cell.reportPress.tag = indexPath.row** 
     } 
return cell 
} 

图像被正确上传到适当的单元格中。我有一个共享按钮，当按下时会打开一个操作表，它具有按钮作为FB等共享。我可以添加一个默认文本，当Facebook的东西弹出。 现在我想从按下分享按钮的特定单元格中获取图像。我知道如何检测按下哪个单元格的共享按钮，但我无法从该单元格获取图像，因为它没有存储在任何地方。

动作片FB

func report() { 

    let actionSheetControllerIOS8: UIAlertController = UIAlertController() 

     let cancelActionButton: UIAlertAction = UIAlertAction(title: "Cancel", style: .Cancel) { action -> Void in 
      print("Cancel") 
     } 
     actionSheetControllerIOS8.addAction(cancelActionButton) 

     let shareFBActionButton: UIAlertAction = UIAlertAction(title: "Share to Facebook", style: .Default) 
     { action -> Void in 
      print("FB shared") 

      ////////////// 
      if SLComposeViewController.isAvailableForServiceType(SLServiceTypeFacebook) { 
       var fbShare:SLComposeViewController = SLComposeViewController(forServiceType: SLServiceTypeFacebook) 

       fbShare.addImage(UIImage(named: "whatever.png")) 

       fbShare.setInitialText("Hello") 
       self.presentViewController(fbShare, animated: true, completion: nil) 

      } else { 
       var alert = UIAlertController(title: "Accounts", message: "Please login to a Facebook account to share.", preferredStyle: UIAlertControllerStyle.Alert) 

       alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil)) 
       self.presentViewController(alert, animated: true, completion: nil) 
      } 
      ///////////// 
     } 
     actionSheetControllerIOS8.addAction(shareFBActionButton) 

     self.presentViewController(actionSheetControllerIOS8, animated: true, completion: nil) 

} 

当feed.swift按下按钮的报告功能被称为

这里的feed.swift

protocol MyCustomCellDelegator { 
func report() 
} 

@IBAction func reportBut(sender: AnyObject) { 

    self.delegate.report() 
    print(reportPress.tag) 

} 

正如你可以看到我可以添加一个图片whatever.png，并在facebook的东西弹出时显示出来。我应该将所有单元格的图像保存在某处，然后使用indexPath.row以某种方式访问​​它？欢迎任何建议！

Answer 1

向共享按钮添加一个标签，对应于cellForRowAtIndexPath中同一个单元格的indexPath.row。

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
    fbShareButton.tag = indexPath.row 
} 

当按钮被按下时，你会得到一个refrence包含图像细胞的indexPath.row所以让我们获得图像。

//sender is you button tht is pressed 
let indexPath = NSIndexPath(forRow: sender.tag, inSection: 0) 
let cell = tableView.cellForRowAtIndexPath(indexPath) as! feed 

//you can now access the image like so 
cell.postedImage.image 

让我知道如果你需要更多的帮助