self.window = [[UIWindow alloc] init];
self.window.frame = [UIScreen mainScreen].bounds;
oneViewController *oneview = [[oneViewController alloc] init];
//设置tabbarItem的图片并且设置渲染模式为UIImageRenderingModeAlwaysOriginal（不渲染，使用原始图片） 默认渲染
oneview.tabBarItem.image = [[UIImage imageNamed:@"tabbar_discover_selected"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
//设置选中控制器的tabbarItem的图片并且设置渲染模式为UIImageRenderingModeAlwaysOriginal（不渲染，使用原始图片） 默认渲染
oneview.tabBarItem.selectedImage = [[UIImage imageNamed:@"tabbar_discover_os7"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
twoViewController *twoview = [[twoViewController alloc] init];
twoview.tabBarItem.image = [[UIImage imageNamed:@"tabbar_home"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
twoview.tabBarItem.selectedImage = [[UIImage imageNamed:@"tabbar_home_selected_os7"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
XJTabBarController *tabC = [[XJTabBarController alloc] init];
//添加子控制器方式一
// [tabC addChildViewController:oneview];
//添加子控制器方式二
tabC.viewControllers = @[oneview,twoview];
self.window.rootViewController = tabC;