实现各种各样的图形、动画效果。例子中展现的是各种各样视图出现和消失的例子，例如视图的淡入淡出、飞进飞出等等。-FTUtils iPhone Utility Code Library =================================== The code in FTUtils is common utility code extracted from [Free Time Studios](http://www.freetimestudios.com/) iPhon

一个可以展开的多级列表，以树的形式组织数据，完成了折叠和展开动画-A multi-level list can be expanded in order to organize the data in the form of a tree, complete the folding and unfolding animation

一款非常好用的目录树展开的demo程序.-A very useful directory tree, expand the demo program.