ios - Swift 2 TableView 将图像从网络传递到下一个 Controller

Question

我的tableView显示来自网络的图像列表。我尝试将图像数据传递到下一个 Controller ，但失败了。这是我的步骤:

1) 声明一个空的 UIImage 变量 => 2) 从 url 设置单元格的图像 => 3) 当用户选择单元格时获取单元格的图像 => 将其传递给下一个 Controller

但是，它正在将空图像传递给下一个 Controller ..

var myImage: UIImage?

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

                if let cellImage = URLArray[indexPath.row]["image"] {
                        do {
                            let imgURL: NSURL = NSURL(string: cellImage!)!
                            let request: NSURLRequest = NSURLRequest(URL: imgURL)

                            let session = NSURLSession.sharedSession()
                            let task = session.dataTaskWithRequest(request){
                                (data, response, error) -> Void in

                                if (error == nil && data != nil) {
                                    func display_image() {
                                        cell.placeImage.image = UIImage(data: data!)!
                                    }
                                    dispatch_async(dispatch_get_main_queue(), display_image)
                                } else {
                                    cell.placeImage.image = UIImage(named: "image1")!
                                }
                            }
                            task.resume()
                        }
            }
            return cell
        }

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

            let selectedCell = tableView.cellForRowAtIndexPath(indexPath)! as! customCell
            self.myImage = selectedCell.placeImage.image

            performSegueWithIdentifier("showDetail", sender: self)
    }

// prepareForSegue
   if segue.identifier == "showDetail" {
  let controller = (segue.destinationViewController as! secondViewController)
   controller.Image = self.myImage 

Answer 1

您需要在prepareForSegue中获取点击单元格的引用:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if let identifier = segue.identifier{
            if(identifier == "showDetail") {
                if let sender = sender as? customCell{
                        if let secondViewController = segue.destinationViewController as? secondViewController {
                                secondViewController.Image = sender.placeImage
                        }
                }
            }
        }
    }

要使其正常工作，您需要在 Storyboard 中设置从 Cell 到第二个ViewController 的“showDetail”segue