Yii makes it really easy for all to use their already made objects that automate everything we do. It provides also great power of flexibility and styling but hey, we programmers tend to complicate our lives and push a little more the power of our tools.
In Yii 2.0, the yii widgets that use Twitter Bootstrap CSS & JS directly, are part of the yii2-bootstrap extension, starting with yii/bootstrap namespace. For customizing bootstrap extension specific widget assets, you could configure your own assets (CSS/JS) using the new Yii Asset Manager in your Yii Config file. Something like:
In this tutorial will be explained a method to manage some configuration runtime. This excellent tutorial follows a similar approach, but requires to write a masterclass which all controllers are supposed to extend, following this wiki you can achieve the same by only editing the configuration.
I recently created a project called Yii-App on GitHub to kickstart my development of smaller Yii applications. The main goal of the project is to provide a ready-to-use application template that includes my bootstrap extension and many other useful extensions. After reading this article you will be able to use this project as a starting point for all of your Yii projects.