AWS S3从照片库上传图片并下载

I've looked many amazon docs but didn't find enough information to upload and download images to S3 using Swift.
How can I do that?

我看过很多亚马逊文档，但是没有找到足够的信息来上传和下载图片到S3使用Swift。我怎么做呢?

2 个解决方案

#1

After doing many research I've got this working,

在做了很多研究之后，我成功了，

import AWSS3
import AWSCore

Upload:

上传:

I assume you have implemented UIImagePickerControllerDelegate already.

我想你已经实现了UIImagePickerControllerDelegate。

Step 1:

步骤1:

• Create variable for holding url:

  创建保存url的变量:

  var imageURL = NSURL()
  

• Create upload completion handler obj:

  创建上传完成处理程序obj:

  var uploadCompletionHandler: AWSS3TransferUtilityUploadCompletionHandlerBlock?
  

Step 2: Get Image URL from imagePickerController(_:didFinishPickingMediaWithInfo:):

步骤2:从imagePickerController获取图像URL (_:didFinishPickingMediaWithInfo:):

• Set value of imageURL in this delegate method:

  在此委托方法中设置imageURL的值:

  func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]){
  
      //getting details of image
      let uploadFileURL = info[UIImagePickerControllerReferenceURL] as! NSURL
  
      let imageName = uploadFileURL.lastPathComponent
      let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first! as String
  
      // getting local path
      let localPath = (documentDirectory as NSString).stringByAppendingPathComponent(imageName!)
  
  
      //getting actual image
      let image = info[UIImagePickerControllerOriginalImage] as! UIImage
      let data = UIImagePNGRepresentation(image)
      data!.writeToFile(localPath, atomically: true)
  
      let imageData = NSData(contentsOfFile: localPath)!
      imageURL = NSURL(fileURLWithPath: localPath)
  
      picker.dismissViewControllerAnimated(true, completion: nil)
  }
  

Step 3: Call this uploadImage method after imageURL set to Upload Image to your bucket:

步骤3:在imageURL设置后调用这个uploadImage方法，将图像上传到您的bucket:

func uploadImage(){

    //defining bucket and upload file name
    let S3BucketName: String = "bucketName"
    let S3UploadKeyName: String = "public/testImage.jpg"


    let expression = AWSS3TransferUtilityUploadExpression()
    expression.uploadProgress = {(task: AWSS3TransferUtilityTask, bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) in
        dispatch_async(dispatch_get_main_queue(), {
            let progress = Float(totalBytesSent) / Float(totalBytesExpectedToSend)
            print("Progress is: \(progress)")
        })
    }

    self.uploadCompletionHandler = { (task, error) -> Void in
        dispatch_async(dispatch_get_main_queue(), {
            if ((error) != nil){
                print("Failed with error")
                print("Error: \(error!)");
            }
            else{
                print("Sucess")
            }
        })
    }

    let transferUtility = AWSS3TransferUtility.defaultS3TransferUtility()

    transferUtility.uploadFile(imageURL, bucket: S3BucketName, key: S3UploadKeyName, contentType: "image/jpeg", expression: expression, completionHander: uploadCompletionHandler).continueWithBlock { (task) -> AnyObject! in
        if let error = task.error {
            print("Error: \(error.localizedDescription)")
        }
        if let exception = task.exception {
            print("Exception: \(exception.description)")
        }
        if let _ = task.result {
            print("Upload Starting!")
        }

        return nil;
    }
}

Download:

下载:

func downloadImage(){

    var completionHandler: AWSS3TransferUtilityDownloadCompletionHandlerBlock?

    let S3BucketName: String = "bucketName"
    let S3DownloadKeyName: String = "public/testImage.jpg"

    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)
            print("Progress is: \(progress)")
        })
    }

    completionHandler = { (task, location, data, error) -> Void in
        dispatch_async(dispatch_get_main_queue(), {
            if ((error) != nil){
                print("Failed with error")
                print("Error: \(error!)")
            }
            else{
                //Set your image
                var downloadedImage = 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 {
            print("Error: \(error.localizedDescription)")
        }
        if let exception = task.exception {
            print("Exception: \(exception.description)")
        }
        if let _ = task.result {
            print("Download Starting!")
        }
        return nil;
    }

}

Ref. for upload image

引用上传图片

Ref. for download image

引用下载图片

Many thanks to jzorz

非常感谢jzorz

#2

If all you want is to download the image, this is a much more concise and correct way to do it:

如果你只想下载图片，这是一种更简洁、更正确的方式:

func downloadImage(bucketName: String, fileName: String, completion: (image: UIImage?, error: NSError?) -> Void) {
    let transferUtility = AWSS3TransferUtility.defaultS3TransferUtility()

    transferUtility.downloadDataFromBucket(bucketName, key: fileName, expression: nil) { (task, url, data, error) in
        var resultImage: UIImage?

        if let data = data {
            resultImage = UIImage(data: data)
        }

        completion(image: resultImage, error: error)
    }
}