给图片文件写入exif信息（ios）

http://code.google.com/p/iphone-exif/

What

An Exif Tag library editor that enables direct viewing and editing of EXIF Meta Data tags in Jpeg files on the iPhone.

Uses

The most obvious use is to manage Geo location tags into the image. However, it is also possible to edit any of the Exif tags or add your own that are not in the spec.

This is really useful for image uploads from the phone for sites like Picasa and Flickr.

Features

On device parsing and editing of EXIF in JPEG files
Full support for GPS tag formats
Roundtrips existing tags in the image
Read/Write access to all EXIF tags
Read access to JFIF data
Allows custom handlers to override normal processing of any tag data
Allows extra handlers to be registered to add user defined tags
Builds as a static library which can be imported easily into an iphone project

Documentation

There is some documentation in the project directory and an early version user guide is in the download section. There is an initial getting started discussion at http://iphone-land.blogspot.com