UIImagePickerController and extracting EXIF data from existing photos

#import "EXFJpeg.h"

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {
    NSLog(@"image picked %@ with info %@", image, editingInfo);
    NSData* jpegData = UIImageJPEGRepresentation (image,0.5);
    EXFJpeg* jpegScanner = [[EXFJpeg alloc] init];
    [jpegScanner scanImageData: jpegData];
    EXFMetaData* exifData = jpegScanner.exifMetaData;
    EXFJFIF* jfif = jpegScanner.jfif;
    EXFTag* tagDefinition = [exifData tagDefinition: [NSNumber numberWithInt:EXIF_DateTime]];
    //EXFTag* latitudeDef = [exifData tagDefinition: [NSNumber numberWithInt:EXIF_GPSLatitude]];
    //EXFTag* longitudeDef = [exifData tagDefinition: [NSNumber numberWithInt:EXIF_GPSLongitude]];
    id latitudeValue = [exifData tagValue:[NSNumber numberWithInt:EXIF_GPSLatitude]];
    id longitudeValue = [exifData tagValue:[NSNumber numberWithInt:EXIF_GPSLongitude]];
    id datetime = [exifData tagValue:[NSNumber numberWithInt:EXIF_DateTime]];
    id t = [exifData tagValue:[NSNumber numberWithInt:EXIF_Model]];
....
....

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    // Try to get the original file.
    NSURL *originalFile = [info objectForKey:UIImagePickerControllerMediaURL];
    if (originalFile) {
        NSData *fileData = [NSData dataWithContentsOfURL:originalFile];
    }
}

-(void) imagePickerController:(UIImagePickerController *)picker
           didFinishPickingMediaWithInfo:(NSDictionary *)info
{
  NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
  if ([mediaType isEqualToString:(NSString*)kUTTypeImage]) {
    NSURL *url = [info objectForKey:UIImagePickerControllerReferenceURL];
    if (url) {
      ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset) {
      CLLocation *location = [myasset valueForProperty:ALAssetPropertyLocation];
      // location contains lat/long, timestamp, etc
      // extracting the image is more tricky and 5.x beta ALAssetRepresentation has bugs!
    };
    ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError *myerror) {
      NSLog(@"cant get image - %@", [myerror localizedDescription]);
    };
    ALAssetsLibrary *assetsLib = [[ALAssetsLibrary alloc] init];
    [assetsLib assetForURL:url resultBlock:resultblock failureBlock:failureblock];
  }
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

  id thumbnailView = [[[[[[[[[[picker.view subviews]
                  objectAtIndex:0] subviews]
                  objectAtIndex:0] subviews]
                objectAtIndex:0] subviews]
                objectAtIndex:0] subviews]
              objectAtIndex:0];

  NSString *fullSizePath = [[[thumbnailView selectedPhoto] fileGroup] pathForFullSizeImage];
  NSString *thumbnailPath = [[[thumbnailView selectedPhoto] fileGroup] pathForThumbnailFile];

  NSLog(@"%@ and %@", fullSizePath, thumbnailPath);

}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    // Try to get the original file.
    NSURL *originalFile = [info objectForKey:UIImagePickerControllerMediaURL];
    if (originalFile) {
        NSData *fileData = [NSData dataWithContentsOfURL:originalFile];
    }
}