what is this?

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ImageMetadata is a tool to read and write metadata of image.

how to use

You can select a image in the album of your phone and read metadata of Exif,GPS and tiff.when adding data in a image,to write with a specific format and saves,the image will contain the data you need.

codes

• Use UIImagePickerController to support the function of album browsing,you need import <AssetsLibrary/AssetsLibrary.h> and <ImageIO/ImageIO.h>,add the delegate of UIImagePickerControllerDelegate and UINavigationBarDelegate.

• Add the imagePickerController to browse local album

   UIImagePickerController *ctrl = [[UIImagePickerController alloc] init];
   ctrl.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
   trl.delegate = self;
   [self presentViewController:ctrl animated:YES completion:nil];
       
  

• Read and write data in the method imagePickerController: didFinishPickingMediaWithInfo of UIImagePickerControllerDelegate.