Swift如何修改从移动相机拍摄的图像中的exif信息 [英] Swift how to modify exif info in images taken from mobile camera
问题描述
我使用UIImagePickerController在我的iOS应用程序中选择图像,我知道可以通过info [UIImagePickerControllerMediaMetadata]获取exif信息。但是当我通过UIImage将我的图像上传到我的服务器时,大多数exif信息都被条带化了。我想知道是否可以在Http请求中将exif信息添加到我的图像中(之后上传为jpg的图像)。如果没有,我该如何解决这个问题?我想改变Make,Model属性(换句话说,用什么设备来拍这张照片)
I use UIImagePickerController to pick images in my iOS App and I know exif info can be got by info[UIImagePickerControllerMediaMetadata]. But when I upload my image to my server by UIImage, most of exif info has been striped. I wonder whether I can add exif info to my image in Http request(image uploaded as jpg after that). If not, how should I solve this problem? I wanna change Make, Model attributes(in other words, what device was used to take this picture)
以下是我的代码片段:
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: "http://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)\r\n")
body.appendString("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.appendString("\(value)\r\n")
}
}
let filename = "test.jpg"
let mimetype = "image/jpg"
body.appendString("--\(boundary)\r\n")
body.appendString("Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n")
body.appendString("Content-Type: \(mimetype)\r\n\r\n")
body.appendData(imageDataKey)
body.appendString("\r\n")
body.appendString("--\(boundary)--\r\n")
return body
}
func generateBoundaryString() -> String {
return "Boundary-\(NSUUID().UUIDString)"
}
extension NSMutableData {
func appendString(string: String) {
let data = string.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)
appendData(data!)
}
}
推荐答案
是的!最后我做了一个修改EXIF信息的技巧。首先,您可以通过UIImageJPEGRepresentation从信息[UIImagePickerControllerMediaMetadata]和没有EXIF的NSData获取EXIF信息。然后,您可以使用修改的EXIF信息创建新的NSDictionary。在此之后,打电话给我的功能在下面,你可以得到图像的NSData与修改EXIF
Yes! Finally I made a trick to modify the EXIF info. At first, you can get EXIF info from info[UIImagePickerControllerMediaMetadata] and NSData without EXIF from picked UIImage by UIImageJPEGRepresentation. Then, you can create a new NSDictionary with modified EXIF info. After that, call my function in the following, you can get image NSData with modified EXIF!
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! ")
}
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