VerticalTabbarController

A vertical tabbar controller for iPad.

使用方法一:
    1、继承此类
    2、设置 self.viewControllers
    3、设置 self.dock.dockItems (可设置属性包括:title, image, selectedImage, 
                                backgroundColor, selectedBackgroundColor)
    4、设置 self.dock.itemHeight 和 self.dock.dockWidth 默认是 80*80
    5、设置此类为启动页
    例:
          UIViewController *vc1 = [[UIViewController alloc] init];
          UIViewController *vc2 = [[UIViewController alloc] init];

          self.viewControllers = @[vc1, vc2];

          self.dock.dockItems = @[[DockItem itemWithImage:image
                                            selectedImage:selectedImage
                                                    title:title],……];
使用方法二:
    在AppDelegate中设置

          VerticalTabbarController *vc = [[VerticalTabbarController alloc] init];
          
          UIViewController *vc1 = [[UIViewController alloc] init];
          UIViewController *vc2 = [[UIViewController alloc] init];

          vc.viewControllers = @[vc1, vc2];

          vc.dock.dockItems = @[[DockItem itemWithImage:image
                                          selectedImage:selectedImage
                                                  title:title], ...];
          self.window.rootViewController = vc;
          [self.window addSubview:vc.view];