Amazon S3 Cognito - 从图像选择器上传图像 - Swift 3

Question

我已成功将静态图片上传到 AWS 服务器。当我将它与 imagepicker 结合使用时，我遇到了一个奇怪的问题，因为即使我以不同的方式选择和命名它们，但仍将相同的图像上传到 AWS。代码如下：

internal func imagePickerController(_ picker: UIImagePickerController,
 didFinishPickingMediaWithInfo info: [String : Any])
 {
    let image = info[UIImagePickerControllerOriginalImage] as! UIImage
    var imageUrl          = info[UIImagePickerControllerReferenceURL] as? NSURL
    let imageName         = imageUrl?.lastPathComponent
    let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first!
    let photoURL          = NSURL(fileURLWithPath: documentDirectory)
    let localPath         = photoURL.appendingPathComponent(imageName!)

    print("image name : \(imageName)")

    if !FileManager.default.fileExists(atPath: localPath!.path) {
        do {
            try UIImageJPEGRepresentation(image, 1.0)?.write(to: localPath!)
            print("file saved")
            //let imageData = NSData(contentsOf: localPath!)
            //let finalURL = localPath!

            //this is in swift 2; above 2 lines are its equivalent in swift3. I think the problem lies here
            //let imageData = NSData(contentsOfFile: localPath)!
            //imageURL = NSURL(fileURLWithPath: localPath)

        }catch {
            print("error saving file")
        }
    }
    else {
        print("file already exists")
    }

    self.dismiss(animated: true, completion: nil)

    let credentialProvider = AWSCognitoCredentialsProvider(regionType: .USEast1, identityPoolId: "identity pool id")
    let configuration = AWSServiceConfiguration(region: .APSoutheast1, credentialsProvider: credentialProvider)
    AWSServiceManager.default().defaultServiceConfiguration = configuration

    //these are the static values I used that worked perfectly fine with separate images
    //let localFileName = "Alerts_bg"
    //let ext = "png"
    //let remoteName = localFileName + "." + ext
    //let imageURL = Bundle.main.url(forResource: localFileName, withExtension: ext)!

    let transferManager = AWSS3TransferManager.default()

    let uploadRequest = AWSS3TransferManagerUploadRequest()!
    uploadRequest.bucket = "bucket"
    let imageAWSName = "ios_" + NSUUID().uuidString + ".jpg"
    uploadRequest.key = imageAWSName
    uploadRequest.body = localPath! as URL
    uploadRequest.contentType = "image/jpg"

    print("req123 : \(uploadRequest)")

    uploadRequest.uploadProgress = { (bytesSent, totalBytesSent, totalBytesExpectedToSend) -> Void in
        DispatchQueue.main.async(execute: {
            //self.amountUploaded = totalBytesSent // To show the updating data status in label.
            //self.fileSize = totalBytesExpectedToSend
            print("progress : \(totalBytesSent)/\(totalBytesExpectedToSend)")
        })
    }

    transferManager.upload(uploadRequest).continueWith(executor: AWSExecutor.mainThread(), block: { (task:AWSTask<AnyObject>) -> Any? in
        if let error = task.error {
            print("Upload failed with error: (\(error.localizedDescription))")
        }
        if task.result != nil {

            let s3URL = URL(string: "https://s3-ap-southeast-1.amazonaws.com/bucket/\(imageAWSName)")!
            print("Uploaded to:\(s3URL)")
        }
        return nil
    })

 dismiss(animated:true, completion: nil) //5
 }

我看过很多博客，例如 this and this，但这些都是 swift 的早期版本，我无法将其转换为 Swift 3 并正确地将 imagepicker 与 AWS 结合使用. 有人请帮忙。

Answer 1

实际上，当你这样做的时候：

let photoURL          = NSURL(fileURLWithPath: documentDirectory)
let localPath         = photoURL.appendingPathComponent(imageName!)

您正在将 localPath 创建为 URL。
所以当你在做的时候：

let imageURL = NSURL(fileURLWithPath: localPath)

它给出了错误，因为 localPath 是 URL 而不是 String。这里可以直接用as:

let imageURL = localPath!

Answer 2

我找到了解决问题的方法：

let imageAWSName = "ios_" + NSUUID().uuidString + ".jpg"

    let image = info[UIImagePickerControllerOriginalImage] as! UIImage
    let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first!
    let photoURL          = NSURL(fileURLWithPath: documentDirectory)
    let localPath         = photoURL.appendingPathComponent(imageAWSName)

    if !FileManager.default.fileExists(atPath: localPath!.path) {
        do {
            try UIImageJPEGRepresentation(image, 1.0)?.write(to: localPath!)
            print("file saved")
        }catch {
            print("error saving file")
        }
    }
    else {
        print("file already exists")
    }

    let credentialProvider = AWSCognitoCredentialsProvider(regionType: .USEast1, identityPoolId: “your identity pool id”)
    let configuration = AWSServiceConfiguration(region: .APSoutheast1, credentialsProvider: credentialProvider)
    AWSServiceManager.default().defaultServiceConfiguration = configuration

    let transferManager = AWSS3TransferManager.default()

    let uploadRequest = AWSS3TransferManagerUploadRequest()!
    let yourBucketName = “your bucket name”
    uploadRequest.bucket = yourBucketName

    uploadRequest.key = imageAWSName
    uploadRequest.body = localPath! as URL
    uploadRequest.contentType = "image/jpg"

    uploadRequest.uploadProgress = { (bytesSent, totalBytesSent, totalBytesExpectedToSend) -> Void in
        DispatchQueue.main.async(execute: {
            //self.amountUploaded = totalBytesSent // To show the updating data status in label.
            //self.fileSize = totalBytesExpectedToSend
            print("progress : \(totalBytesSent)/\(totalBytesExpectedToSend)")
        })
    }

    transferManager.upload(uploadRequest).continueWith(executor: AWSExecutor.mainThread(), block: { (task:AWSTask<AnyObject>) -> Any? in
        if let error = task.error {
            print("Upload failed with error: (\(error.localizedDescription))")
        }
        if task.result != nil {

            let s3URL = URL(string: "https://s3-ap-southeast-1.amazonaws.com/\(yourBucketName)/\(imageAWSName)")!
            print("Uploaded to:\(s3URL)")
        }
        return nil
    })

    self.picker.dismiss(animated: true, completion: nil)

确保 localPath 中使用的 imageAWSName 始终与我所做的不同。这是最主要的事情，否则即使您从选择器中选择不同的图像，AWS 也会多次保存相同的图像。

希望对以后的人有所帮助！

Amazon S3 Cognito - 从图像选择器上传图像 - Swift 3

Amazon S3 Cognito - Upload image from image picker - Swift 3

amazon-s3

uiimagepickercontroller

amazon-web-services

ios

swift3