In the example I will be downloading an image from my S3 bucket using S3TransferUtility for iOS in swift. You can find the source here on github
In the example i have 2 outlets:
1 2 | @IBOutlet weak var progressView: UIProgressView!@IBOutlet weak var imageView: UIImageView! |
This function defines what s3 bucket we are using and the file/image we need to download. It then handles the progress view and finally the image view.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | func downloadImage(){ var completionHandler: AWSS3TransferUtilityDownloadCompletionHandlerBlock? //downloading image let S3BucketName: String = "yourBucketName" let S3DownloadKeyName: String = "example-image-1.png" let expression = AWSS3TransferUtilityDownloadExpression() expression.downloadProgress = {(task: AWSS3TransferUtilityTask, bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) in dispatch_async(dispatch_get_main_queue(), { let progress = Float(totalBytesSent) / Float(totalBytesExpectedToSend) self.progressView.progress = progress // self.statusLabel.text = "Downloading..." NSLog("Progress is: %f",progress) }) } self.completionHandler = { (task, location, data, error) -> Void in dispatch_async(dispatch_get_main_queue(), { if ((error) != nil){ NSLog("Failed with error") NSLog("Error: %@",error!); // self.statusLabel.text = "Failed" } else if(self.progressView.progress != 1.0) { // self.statusLabel.text = "Failed" NSLog("Error: Failed - Likely due to invalid region / filename") } else{ // self.statusLabel.text = "Success" self.imageView.image = UIImage(data: data!) } }) } let transferUtility = AWSS3TransferUtility.defaultS3TransferUtility() transferUtility?.downloadToURL(nil, bucket: S3BucketName, key: S3DownloadKeyName, expression: expression, completionHander: completionHandler).continueWithBlock { (task) -> AnyObject! in if let error = task.error { NSLog("Error: %@",error.localizedDescription); // self.statusLabel.text = "Failed" } if let exception = task.exception { NSLog("Exception: %@",exception.description); // self.statusLabel.text = "Failed" } if let _ = task.result { // self.statusLabel.text = "Starting Download" NSLog("Download Starting!") // Do something with uploadTask. } return nil; } } |
Hi jzorz,
I am getting this error pls help me, Nil is not compatible with expected argument type ‘NSURL’ near the line below
-> transferUtility?.downloadToURL(nil, bucket: ……
Hi Puneeth. Do you have var completionHandler: AWSS3TransferUtilityDownloadCompletionHandlerBlock? in your controller? I’ve added source files on github so you can quickly view how I did it. Github