How to integrate cocos2d-iphone-3.1.0 into existing iOS project?

Question

I am working on old project in which i need to update code. The project also uses cocos 2d older version. When i build project with latest Xcode 6.0, it gives many errors. I tried the old way to integrate. I followed the steps given into Adding Cocos2D only to already existing project? not solves my problem. I am getting error like "Could not build module 'UIKit' " and many more similar error for other framework. So i decided to integrate new version of cocos 2d 3.1.0. Thanks in advance.