A custom tab bar controller for iOS.

Available in [CocoaPods](http://cocoapods.org/?q= BSTabBarController)

pod 'BSTabBarController'

or

1. Copy BSTabBarController folder to your project;
2. Install 'Masonry' via CocoaPods or other way.

1. Use BSTabBarController instead of UITabBarController
2. Use bsTabBarController property instead of tabBarController of UIViewController

Note that, this tab bar controller only can be initialize with tab bar item once, it won't observer changes of tab bar item.

You can custom tab bar of BSTabBarController like demo in the repo.