モバイルカメラから撮影した画像のexif情報を変更する方法

私はiOSアプリケーションで画像を選択するためにUIImagePickerControllerを使用し、exif情報はinfo[UIImagePickerControllerMediaMetadata]で得ることができます。しかし、UIImageで自分のサーバーに画像をアップロードすると、exif情報のほとんどがストライプされています。 Httpリクエストで画像にexif情報を追加できるかどうかは疑問です(その後jpgとしてアップロードされた画像)。そうでない場合、どうすればこの問題を解決できますか? Make、Mod

以下は私のコードスニペットです:

func Tapped() {
let myPickerController = UIImagePickerController()

myPickerController.delegate = self
myPickerController.sourceType = UIImagePickerControllerSourceType.Camera
myPickerController.allowsEditing = false
self.presentViewController(myPickerController, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
let image = info[UIImagePickerControllerOriginalImage] as? UIImage
myImageView.image = image
UIImageWriteToSavedPhotosAlbum(image!, self, #selector(ViewController.image(_:didFinishSavingWithError:contextInfo:)), nil)
self.dismissViewControllerAnimated(true, completion: nil)
}

func myImageUploadRequest()
{

let myUrl = NSURL(string: “https://XXXXXX/Uploadfile”)

let request = NSMutableURLRequest(URL:myUrl!)
request.HTTPMethod = “POST”

let param = [
“userId” : “7”
]

let boundary = generateBoundaryString()

request.setValue(“multipart/form-data; boundary=(boundary)”, forHTTPHeaderField: “Content-Type”)

let imageData = UIImageJPEGRepresentation(myImageView.image!, 1)

if(imageData == nil) { return; }

request.HTTPBody = createBodyWithParameters(param, filePathKey: “file”, imageDataKey: imageData!, boundary: boundary)

myActivityIndicator.startAnimating()

let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
data, response, error in

if error != nil {
print(“error=(error)”)
return
}

// You can print out response object
print(“******* response = (response)”)

// Print out response body
let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)
print(“****** response data = (responseString!)”)

do{
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSDictionary

}catch{
print(error)
}

dispatch_async(dispatch_get_main_queue(),{
self.myActivityIndicator.stopAnimating()
self.myImageView.image = nil
})

}

task.resume()
}

func createBodyWithParameters(parameters: [String: String]?, filePathKey: String?, imageDataKey: NSData, boundary: String) -> NSData {
let body = NSMutableData();

if parameters != nil {
for (key, value) in parameters! {
body.appendString(“–(boundary)
“)
body.appendString(“Content-Disposition: form-data; name=”(key)”

“)
body.appendString(“(value)
“)
}
}

let filename = “test.jpg”

let mimetype = “image/jpg”

body.appendString(“–(boundary)
“)
body.appendString(“Content-Disposition: form-data; name=”(filePathKey!)”; filename=”(filename)”
“)
body.appendString(“Content-Type: (mimetype)

“)
body.appendData(imageDataKey)
body.appendString(”
“)

body.appendString(“–(boundary)–
“)

return body
}

func generateBoundaryString() -> String {
return “Boundary-(NSUUID().UUIDString)”
}

extension NSMutableData {
func appendString(string: String) {
let data = string.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)
appendData(data!)
}
}

はい!最後に、EXIF情報を変更するトリックを作成しました。最初は、UIImageJPEGRepresentationによってUIImageからEXIFを選択せずにinfo [UIImagePickerControllerMediaTata]とNSDataからEXIF情報を取得できます。次に、変更されたEXIF情報を使用して新しいNSDictionaryを作成できます。その後、私の

func saveImageWithImageData(data: NSData, properties: NSDictionary, completion: (data: NSData, path: NSURL) -> Void) {

let imageRef: CGImageSourceRef = CGImageSourceCreateWithData((data as CFDataRef), nil)!
let uti: CFString = CGImageSourceGetType(imageRef)!
let dataWithEXIF: NSMutableData = NSMutableData(data: data)
let destination: CGImageDestinationRef = CGImageDestinationCreateWithData((dataWithEXIF as CFMutableDataRef), uti, 1, nil)!

CGImageDestinationAddImageFromSource(destination, imageRef, 0, (properties as CFDictionaryRef))
CGImageDestinationFinalize(destination)

var paths: [AnyObject] = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let savePath: String = paths[0].stringByAppendingPathComponent(“exif.jpg”)

let manager: NSFileManager = NSFileManager.defaultManager()
manager.createFileAtPath(savePath, contents: dataWithEXIF, attributes: nil)

completion(data: dataWithEXIF,path: NSURL(string: savePath)!)

print(“image with EXIF info converting to NSData: Done! Ready to upload! “)

}