1. 【Unity3D ugui】简单控件的事件监听 http://www.lai18.com/content/9917282.html
2. UGUI研究院之控件以及按钮的监听事件系统（五）http://www.xuanyusong.com/archives/3325
3. Unity3d中EventTrigger的封装 http://blog.csdn.net/liujunjie612/article/details/45532813
4. Unity3d使用UGUI实现长按功能 http://www.taikr.com/article/182
5.UGUI 如何检测UI的双击http://blog.csdn.net/qq_15267341/article/details/52893465
6. 较全，http://blog.csdn.net/qq992817263/article/details/50670583
7. 高级 https://gist.github.com/smallrice45/e1ba6a3dc567fb251067624c972d9bbb
