【UI7Kit】
UI7Kit is a GUI toolkit which can backport flat-style UIKit from iOS7 to iOS5/iOS6. Additionally, UI7Kit can also be used to patch legacy UIKit to UI7Kit in runtime.
NOTE: This project is not mature yet and is being refined. You may come across some bugs or unexpected behaviors for complex real-world product.（2014/04/21）
More Information：https://github.com/youknowone/UI7Kit