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    <p>I recently used protocol buffers to great effect in this particular area. It's got very very little overhead and performs better than the native objective C serialization/deserialization(at least on the ipod touch I'm testing for performance with, since it is the slowest device we want to support).</p> <p>It took me a while to set them up as a newbie in iOS development though(the python side was really easy though).</p> <p>This blog post really helps: <a href="http://nserror.me/blog/2011/06/03/protocol-buffers-and-xcode/" rel="nofollow">http://nserror.me/blog/2011/06/03/protocol-buffers-and-xcode/</a></p> <p>To summarize on how to integrate protocol buffers into an objective C project -- This took me a whole day to piece together so I'm putting it up in the hope someone in my situation finds it useful:</p> <ul> <li>get protocol buffers from <a href="http://code.google.com/p/protobuf/" rel="nofollow">here</a></li> <li>configure/make/make install</li> <li>get <a href="https://github.com/booyah/protobuf-objc" rel="nofollow">this</a> project(that's git clone <a href="https://github.com/booyah/protobuf-objc.git" rel="nofollow">https://github.com/booyah/protobuf-objc.git</a> for the lazy)</li> <li>autogen.sh/configure/make/make install</li> <li>In protobuf-objc/src/runtime there is an xcode project. Open it, build and then close xcode again. It is really important you do this.</li> <li>open up your project in Xcode. Go to the "build rules" tab in the target. Add a custom build rule for *.proto files.</li> </ul> <p>The script:</p> <pre><code>/usr/local/bin/protoc --plugin=/usr/local/bin/protoc-gen-objc \ --proto_path=${INPUT_FILE_DIR} \ --objc_out=${DERIVED_SOURCES_DIR} \ ${INPUT_FILE_PATH} </code></pre> <p>The output files:</p> <pre><code>${DERIVED_SOURCES_DIR}/${INPUT_FILE_BASE}.pb.h ${DERIVED_SOURCES_DIR}/${INPUT_FILE_BASE}.pb.m </code></pre> <ul> <li>copy the protobuf-objc project into the same directory you have your .xcodeproj in</li> <li>Add a reference to the project in protobuf-obj/src/runtime (just drag into from finder into your project</li> <li>Under "build phases" for your target add a dependency on ProtocolBuffers</li> <li>Under "build settings" select the "all" view and add the following to your header search paths: ${SOURCE_ROOT}/protobuf-objc/src/runtime/Build/Products</li> <li>In the summary for your target, add a link to the .a file generated by the ProtocolBuffers project.</li> <li>And that's it, from now on, you just add your .proto files to the project(and to the list of files to be compiled) and you can use protocol buffers</li> </ul>
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