Swift如何修改从移动相机拍摄的图像中的exif信息

  • Z时代
  • 2024-01-10
  • 分类：问答

我曾经UIImagePickerController在我的iOS应用程序中选择图像，并且知道exif信息" title="exif信息">exif信息可以通过获取info[UIImagePickerControllerMediaMetadata]。但是，当我通过上载图像到服务器时UIImage，大多数exif信息已经被删除。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（此后以jpg格式上传的图像）。如果没有，我应该如何解决这个问题？我想更改“制作”，“模型”属性（换句话说，使用什么设备拍摄这张照片）

以下是我的代码段：

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!)
    }
}

回答：

是! 最后，我做了一个技巧来修改EXIF信息。首先，您可以通过UIImageJPEGRepresentation从info

[UIImagePickerControllerMediaMetadata]和NSData中获取EXIF信息，而无需从EXImage中获取NSData。然后，您可以使用修改后的EXIF信息创建一个新的NSDictionary。之后，在下面调用我的函数，就可以使用修改后的EXIF获取图像NSData！

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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