Swift - AWS S3从图片库上传图片并下载

Question

我看过很多亚马逊文档,但没有找到足够的信息来使用Swift上传和下载图像到S3.
我怎样才能做到这一点？

Answer 1

经过多次研究后,我得到了这个工作,

import AWSS3
import AWSCore

上传:

我假设你已经实施UIImagePickerControllerDelegate了.

步骤1:

• 创建用于保存url的变量:

  var imageURL = NSURL()
  

• 创建上传完成处理程序obj:

  var uploadCompletionHandler: AWSS3TransferUtilityUploadCompletionHandlerBlock?
  

第2步:从imagePickerController(_:didFinishPickingMediaWithInfo:)以下位置获取图片网址:

• 设置imageURL此委托方法的值:

  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)
  }
  

步骤3:设置为将图像上载到存储桶uploadImage后调用此方法imageURL:

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;
    }
}

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;
    }

}

参考.用于上传图片

参考.下载图片

非常感谢jzorz