UINavigationController 常用方法

设置tabbaritem 图片的样式

childVc.tabBarItem.image = [UIImage imageNamed:image];childVc.tabBarItem.selectedImage = [[UIImage imageNamed:selectedImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

设置tabbaritem 文字的样式

    NSMutableDictionary *titleDic = [NSMutableDictionary dictionary];    titleDic[NSForegroundColorAttributeName] = [UIColor lightGrayColor];    [childVc.tabBarItem setTitleTextAttributes:titleDic forState:UIControlStateNormal];    titleDic[NSForegroundColorAttributeName] = [UIColor orangeColor];    [childVc.tabBarItem setTitleTextAttributes:titleDic forState:UIControlStateSelected];