Swift将多个文件并行上传到AWS S3，并在tableview单元格中显示进度视图状态 [英] Swift upload multiple files parallel into AWS S3 and show progress view status in tableview cell

问题描述

我是AWS新手，我使用TransferUtility文件转换将一些文件上传到AWS S3。这里我的方案步骤

I am new for AWS, I have done some file uploading into AWS S3 with TransferUtility file transformation. Here my scenario steps

1。从iCloud中挑选文件

public func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentAt url: URL) {

        let fileurl: URL = url as URL
        let filename = url.lastPathComponent
        let file-extension = url.pathExtension
        let filedata = url.dataRepresentation

        // Call upload function
        upload(file: fileurl, keyname: filename, exten: file-extension)

        // Append names into array
        items.append(item(title: filename, size: string))
        self.tableView_util.reloadData()

的 2。使用transfer-utility将该文件上传到AWS S3

private func upload(file url: URL, keyname : String, exten: String) {
 transferUtility.uploadfile(file ur,
        bucket: "YourBucket",
        key: "YourFileName",
        contentType: "text/plain",
        expression: expression,
        completionHandler: completionHandler).continueWith {
           (task) -> AnyObject! in
               if let error = task.error {
                  print("Error: \(error.localizedDescription)")
               }

               if let _ = task.result {
                  // Do something with uploadTask.
               }
               return nil;
       }

3。上传需要将每个文件上传状态显示到tableview单元格

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

        let cell = tableView.dequeueReusableCell(withIdentifier: "cellutil", for: indexPath) as! UtilityTableViewCell
        let item = items[indexPath.row]
}

我的问题：tableview我可以显示上传项目，但是当我上传下一个项目时首先上传停止。我需要实现并行上传多个文件并显示单元状态。

My Issue: The tableview I can able to show uploading items but first uploading stopped when I upload next one. I need to achieve parallel upload multiple files and show on cell status.

推荐答案

为此，您需要创建一个Operation队列，每个上传文件在操作内部写入网络请求并将这些操作添加到队列中。

To do that you create a Operation queue, and each upload file write network request inside of operation and add these operations to queue.

这里我给出提示来做这件事。

Here I am giving to hint to do this.

创建一个具有类似

Create a model class that has properties like

struct UploadRecordData { 
    let fileName:String
    let unique_id:String
    let progress:double
    //...etc
}

然后像这样的子类操作

    struct UploadRecordOperation:Operation{
        let uploadRecordData:UploadRecordData
        //etc..

        //update progess inside of operation class
        func updateProgress(progress:Double){
            uploadRecordData.progress = progress
            //edited answer
            let myDict = [ "progress": progress, "unique_id":unique_id]
          NSNotificationCenter.defaultCenter().postNotificationName("refreshProgressBar", object:myDict);
        }
    }

现在这里是表视图控制器的一部分

Now here is the part of table view controller

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier(textCellIdentifier, forIndexPath: indexPath)

    let row = indexPath.row
    let uploadRecordData = uploadfilesRecords[row]
    //edited answer  
    cell.progressView.uniqud_id = uploadRecord.unique_id
    cell.progressView.progress = uploadRecord.progress
    return cell
}

以下是更新刷新上传文件进度时刷新单元格的方法..

您的进度视图的子类如下

struct ProgressView:YourProgressView{
            var unique_id:int

            //Now add notification observer to your progress view
            NotificationCenter.default.addObserver(self, selector: #selector(refreshProgressView), name: "refreshProgressBar", object: nil)


            func refreshProgressView(notification: NSNotification){
                let dict = notification.object as! NSDictionary
                let progress = dict["progress"]
                let u_id = dict["unique_id"]

                if u_id == self.unique_id {
                    self.progress = progress
                }
            }

请参阅操作子类中的上述更新代码表视图委托方法。

Please see above updated code in Operation subclass and table view delegate method.

这是我的解决方案，请让我知道你明白了。谢谢快乐编码!!!

Here is my solution, please let me know you got it . Thanks Happy coding !!!

这篇关于Swift将多个文件并行上传到AWS S3，并在tableview单元格中显示进度视图状态的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！