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在我的 Swift 应用程序中,我可以通过 AWS 开发工具包将图像上传到我的 S3 存储桶。现在,我必须等到文件成功上传后才能关闭视图。

let transferManager = AWSS3TransferManager.defaultS3TransferManager()
    let testFileURL1 = NSURL(fileURLWithPath: NSTemporaryDirectory().stringByAppendingPathComponent("temp"))
    let uploadRequest1 : AWSS3TransferManagerUploadRequest = AWSS3TransferManagerUploadRequest()

    let data = UIImageJPEGRepresentation(image, 0.5)
    data.writeToURL(testFileURL1!, atomically: true)
    uploadRequest1.bucket = "shrikar-picbucket"
    uploadRequest1.key =  "bingo"
    uploadRequest1.body = testFileURL1

    let task = transferManager.upload(uploadRequest1)
    task.continueWithBlock { (task) -> AnyObject! in
        if task.error != nil {
            println("Error: \(task.error)")
        } else {
            println("Upload successful")
            self.dismissViewControllerAnimated(true, completion: nil)
        }
        return nil
    }

即使我在上传完成之前关闭视图,我怎样才能让它工作,以便它上传到后台?

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