Ios AmazonS3上传两次

我在将图像上传到AmazonS3存储桶时遇到了一个奇怪的问题

我观察到，当我在一段时间（一小时？）没有使用应用程序后上传到我的bucket时，在上传完成之前，进度从0%到100%运行了两次。例如，我在下面的代码块中有一个示例，用于确定上载了多少%：

// Track progress through an AWSNetworkingUploadProgressBlock
uploadRequest?.uploadProgress = {[weak self](bytesSent:Int64, totalBytesSent:Int64, totalBytesExpectedToSend:Int64) in
dispatch_sync(dispatch_get_main_queue(), { () -> Void in

    let progress = Float(totalBytesSent) / Float(totalBytesExpectedToSend)

    print(" totalBytesSent \(totalBytesSent) / totalBytesExpectedToSend \(totalBytesExpectedToSend) progress = \(progress * 100 ) %")

    circularProgressView.setProgress(progress, animated: true)

        })
}

对于打印输出，我看到下面的打印输出两次，我观察我的进度循环，在5秒内做两次360度旋转（上传时间）

奇怪的是，如果我在之后重新上传任何东西，它会像预期的那样工作，打印输出只会100%运行一次

下面是我如何处理S3的：

// 1. Save file to disk and retreive NSURL before we can store to Amazon S3
let path: String = NSTemporaryDirectory().stringByAppendingString("\(CURRENT_USER_UID)).jpg")
let imageData: NSData = UIImageJPEGRepresentation(img, 0.1)!
imageData.writeToFile(path, atomically: true)
let url: NSURL = NSURL(fileURLWithPath: path)

// 2. Create upload request
let uploadRequest = AWSS3TransferManagerUploadRequest()
uploadRequest.bucket = "myBucket"
uploadRequest.key = "\(CURRENT_USER_UID)\(Int(NSDate().timeIntervalSince1970)).jpg"
uploadRequest.ACL = AWSS3ObjectCannedACL.PublicRead
uploadRequest.contentType = "image/jpg"
uploadRequest.body = url

// Track progress through an AWSNetworkingUploadProgressBlock
uploadRequest?.uploadProgress = {[weak self](bytesSent:Int64, totalBytesSent:Int64, totalBytesExpectedToSend:Int64) in
    dispatch_sync(dispatch_get_main_queue(), { () -> Void in

        let progress = Float(totalBytesSent) / Float(totalBytesExpectedToSend)

        print(" totalBytesSent \(totalBytesSent) / totalBytesExpectedToSend \(totalBytesExpectedToSend) progress = \(progress * 100 ) %")

        circularProgressView.setProgress(progress, animated: true)

    })
}

// 3. Upload to Amazon S3
let transferManager = AWSS3TransferManager.defaultS3TransferManager()
transferManager.upload(uploadRequest).continueWithExecutor(AWSExecutor.mainThreadExecutor(), withBlock: { (task: AWSTask) -> AnyObject? in

    if let error = task.error {
        if error.domain == AWSS3TransferUtilityErrorDomain {

            MRProgressOverlayView.dismissOverlayForView(self.view, animated: true)
            self.enableUserInteraction()

            switch task.error?.code {
            case AWSS3TransferManagerErrorType.Cancelled.rawValue?:
                break
            case AWSS3TransferManagerErrorType.Paused.rawValue?:
                break
            default:
                self.showErrorAlert("Error uploading image #1", message: "\(error)")
            }
        } else {
            self.showErrorAlert("Error uploading image #2", message: "\(error)")
            MRProgressOverlayView.dismissOverlayForView(self.view, animated: true)
            self.enableUserInteraction()
        }
    } else {
        if task.completed {
            let imgLink = "https://s3.amazonaws.com/mybucket/\(uploadRequest.key!)"
            self.postToFirebase(imgLink, userCoordinate: userCoordinate)

        } else {
            self.showErrorAlert("Error uploading image #3", message: "Please try again later")
            MRProgressOverlayView.dismissOverlayForView(self.view, animated: true)
            self.enableUserInteraction()
        }
    }
    return nil

----更新------ 在查看控制台之后，我发现第一次上传没有成功，因为出现了以下错误

2016-08-20 16:42:51.524 Letzzee[20327:176849]AWSiOSSDK v2.4.5[错误]AWSURLSessionManager.m行：211 |-[AWSURLSessionManager URLSession:task:DidCompleteWitherError:]|会话任务失败，出现错误：错误域=NSURErrorDomain代码=-1005“网络连接丢失”

然而，我不明白为什么这种情况会定期发生。我认为这与我的网络连接无关，因为

我在我的手机上试过WIFI/3G，也在模拟器上试过WIFI。我不知道。如果是网络问题，它应该一直发生，或者不是周期性的

上传总是到100%，并显示该消息。然后自动重新上传，第二次几乎总是成功的

// 1. Save file to disk and retreive NSURL before we can store to Amazon S3
let path: String = NSTemporaryDirectory().stringByAppendingString("\(CURRENT_USER_UID)).jpg")
let imageData: NSData = UIImageJPEGRepresentation(img, 0.1)!
imageData.writeToFile(path, atomically: true)
let url: NSURL = NSURL(fileURLWithPath: path)

// 2. Create upload request
let uploadRequest = AWSS3TransferManagerUploadRequest()
uploadRequest.bucket = "myBucket"
uploadRequest.key = "\(CURRENT_USER_UID)\(Int(NSDate().timeIntervalSince1970)).jpg"
uploadRequest.ACL = AWSS3ObjectCannedACL.PublicRead
uploadRequest.contentType = "image/jpg"
uploadRequest.body = url

// Track progress through an AWSNetworkingUploadProgressBlock
uploadRequest?.uploadProgress = {[weak self](bytesSent:Int64, totalBytesSent:Int64, totalBytesExpectedToSend:Int64) in
    dispatch_sync(dispatch_get_main_queue(), { () -> Void in

        let progress = Float(totalBytesSent) / Float(totalBytesExpectedToSend)

        print(" totalBytesSent \(totalBytesSent) / totalBytesExpectedToSend \(totalBytesExpectedToSend) progress = \(progress * 100 ) %")

        circularProgressView.setProgress(progress, animated: true)

    })
}

// 3. Upload to Amazon S3
let transferManager = AWSS3TransferManager.defaultS3TransferManager()
transferManager.upload(uploadRequest).continueWithExecutor(AWSExecutor.mainThreadExecutor(), withBlock: { (task: AWSTask) -> AnyObject? in

    if let error = task.error {
        if error.domain == AWSS3TransferUtilityErrorDomain {

            MRProgressOverlayView.dismissOverlayForView(self.view, animated: true)
            self.enableUserInteraction()

            switch task.error?.code {
            case AWSS3TransferManagerErrorType.Cancelled.rawValue?:
                break
            case AWSS3TransferManagerErrorType.Paused.rawValue?:
                break
            default:
                self.showErrorAlert("Error uploading image #1", message: "\(error)")
            }
        } else {
            self.showErrorAlert("Error uploading image #2", message: "\(error)")
            MRProgressOverlayView.dismissOverlayForView(self.view, animated: true)
            self.enableUserInteraction()
        }
    } else {
        if task.completed {
            let imgLink = "https://s3.amazonaws.com/mybucket/\(uploadRequest.key!)"
            self.postToFirebase(imgLink, userCoordinate: userCoordinate)

        } else {
            self.showErrorAlert("Error uploading image #3", message: "Please try again later")
            MRProgressOverlayView.dismissOverlayForView(self.view, animated: true)
            self.enableUserInteraction()
        }
    }
    return nil