我上传到AWSS3的图片正在尝试使用以下代码下载。
代码不会通过transferManager.download(downloadRequest).continueWith(executor: AWSExecutor.default(), block: { (task: AWSTask<AnyObject>) -> Any? in
运行,有人可以建议我如何解决此问题。
使用的AWS开发工具包版本(来自pod文件)
pod 'AWSCore', '~> 2.6.7'
pod 'AWSS3', '~> 2.6.7'
static func testDownload(){
let transferManager = AWSS3TransferManager.default()
let downloadingFileURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("temp.jpg")
if let downloadRequest = AWSS3TransferManagerDownloadRequest(){
downloadRequest.bucket = "bucket-name"
downloadRequest.key = "folderName/imageName.png"
downloadRequest.downloadingFileURL = downloadingFileURL
print("downloadRequest \(downloadRequest)")
transferManager.download(downloadRequest).continueWith(executor: AWSExecutor.default(), block: { (task: AWSTask<AnyObject>) -> Any? in
print("transferManager.download func called")
if( task.error != nil){
print(task.error!.localizedDescription)
return nil
}
print(task.result!)
if let data = NSData(contentsOf: downloadingFileURL){
DispatchQueue.main.async(execute: { () -> Void in
let image = UIImage(data: data as Data)
print("Downloaded Image: \(image)")
})
}
return nil
})
}
}
答案 0 :(得分:1)
该块是完成处理程序,将在下载完成后调用。您可以使用以下代码跟踪下载过程的进度:
downloadRequest.downloadProgress = {(bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) -> Void in
DispatchQueue.main.async(execute: {() -> Void in
//Update progress
})
}
此外,您可以尝试使用主线程进行测试,以查看您的存储桶配置或info.plist值是否有问题。
transferManager.download(downloadRequest).continueWith(executor: AWSExecutor.mainThread(), block: { (task:AWSTask<AnyObject>) -> Any? in
if let error = task.error as? NSError {
if error.domain == AWSS3TransferManagerErrorDomain, let code = AWSS3TransferManagerErrorType(rawValue: error.code) {
switch code {
case .cancelled, .paused:
break
default:
print("Error downloading: \(downloadRequest.key) Error: \(error)")
}
} else {
print("Error downloading: \(downloadRequest.key) Error: \(error)")
}
return nil
}
print("Download complete for: \(downloadRequest.key)")
let downloadOutput = task.result
return nil
})
来源:http://docs.aws.amazon.com/mobile/sdkforios/developerguide/s3transfermanager.html