This extension provides JSON support from multiple vendors. The vendors are listed below.

• Core
• Network

Add the extThree20JSON.xcodeproj file to your project. Add extThree20JSON+<vendor>.a to your "Link Binary With Libraries" phase, and add extThree20JSON+<vendor> as a dependency.

Import the following into your precompiled header or wherever you need access to TTURLJSONResponse.

#import "extThree20JSON/extThree20JSON.h"

• SBJSON 2.2.3 (March 7, 2010) https://code.google.com/p/json-framework/
• YAJL 0.2.16 (April 15, 2010) https://lloyd.github.com/yajl/

This library provides targets for each supported vendor. When you include extJSON in your app, you can choose which library you want to build against by adding the specific lib to your linking phase as well as adding the lib's target to your dependencies.

Once you have selected a vendor, you may use TTURLJSONResponse to handle JSON responses. All vendors expose a TTURLJSONResponse object for use so that you can seamlessly switch vendors without breaking any of your code.

Solution 1) Remove the vendor from your project and use the version included in Three20 (which will generally be up-to-date). You can access your vendor's header files using

#import "extThree20JSON/<vendor headers>"

For example, with SBJSON:

#import "extThree20JSON/SBJSON.h"

Solution 2) Take a look at TTURLJSONResponse and copy the implementation into your own project. It's pretty simple.

You'd likely want to use this solution if you strictly depend on an older version of one of the above vendors.