Matthias Tretter (@myell0w) 的库在四边放tabBar，我的这个库的目的是四个边可以放自定义的view。
TODO:Just have a look at the provided Demo-Application and the header files to see what's possible.
NGTabBarController was created by Matthias Tretter (@myell0w).
NGTabBarController is available under the MIT license. See the LICENSE file for more info. For usage without attribution contact NOUSguide.