Swift - AWS S3 从照片库上传图像并下载 [英] Swift - AWS S3 Upload Image from Photo Library and download it

问题描述

我查看了许多亚马逊文档，但没有找到足够的信息来使用 Swift 将图像上传和下载到 S3.
我该怎么做?

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?

推荐答案

在做了很多研究之后，我得到了这个工作，

After doing many research I've got this working,

import AWSS3
import AWSCore

上传:

我假设你已经实现了 UIImagePickerControllerDelegate.

I assume you have implemented UIImagePickerControllerDelegate already.

第 1 步:

• 创建用于保存 url 的变量:

• Create variable for holding url:

var imageURL = NSURL()

创建上传完成处理程序 obj:

Create upload completion handler obj:

var uploadCompletionHandler: AWSS3TransferUtilityUploadCompletionHandlerBlock?

第 2 步:从 imagePickerController(_:didFinishPickingMediaWithInfo:) 获取图片 URL:

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

• 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)
}

第 3 步:在 imageURL 设置为将图像上传到您的存储桶后调用此 uploadImage 方法:

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

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.用于下载图像

非常感谢 jzorz

这篇关于Swift - AWS S3 从照片库上传图像并下载的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！