转发：http://www.cnblogs.com/qianLL/p/5521228.html

方式一

代码实现 这种要写很多代码 ，每个控制器都要写

UIImage *image=[UIImage imageNamed:@"tabBar_friendTrends_click_icon"];

//    不让tabbar底部有渲染的关键代码

image=[image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

vc01.tabBarItem.selectedImage=image;

更改tabbar下方的文字样式，大小， 颜色

NSMutableDictionary *atts=[NSMutableDictionary dictionary];

// 更改文字大小

atts[NSFontAttributeName]=[UIFont systemFontOfSize:12];

// 更改文字颜色

atts[NSForegroundColorAttributeName]=[UIColor darkGrayColor];

NSMutableDictionary *selectedAtts=[NSMutableDictionary dictionary];

selectedAtts[NSFontAttributeName]=[UIFont systemFontOfSize:12];

selectedAtts[NSForegroundColorAttributeName]=[UIColor greenColor];

[vc01.tabBarItem setTitleTextAttributes:selectedAtts forState:UIControlStateSelected];

方式二

在 Assets.xcassets文件夹中更改 改变之后不用代码  并且在所有的控制器里面都会被作用到

具体操作

appearance属性

//    通过appearance统一设置所有的UITabBarItem的文字属性

//    后面带有UI_APPEARANCE_SELECTOR的方法，都可以通过appearance同意设置

例如UITabBarItem的文字属性

案例；

NSMutableDictionary *atts=[NSMutableDictionary dictionary];

atts[NSFontAttributeName]=[UIFont systemFontOfSize:12];

atts[NSForegroundColorAttributeName]=[UIColor grayColor];

NSMutableDictionary *selectedAtts=[NSMutableDictionary dictionary];

selectedAtts[NSFontAttributeName]=atts[NSFontAttributeName];

selectedAtts[NSForegroundColorAttributeName]=[UIColor darkGrayColor];

// 在这里 只要更改，所有的文字都改

UITabBarItem *item=[UITabBarItem appearance];

[item setTitleTextAttributes:atts forState:UIControlStateNormal];

[item setTitleTextAttributes:selectedAtts forState:UIControlStateSelected];

//    添加子控制器

UIViewController *vc01=[[UIViewController alloc]init];

vc01.view.backgroundColor=[UIColor redColor];

vc01.tabBarItem.title=@"精华";

vc01.tabBarItem.image=[UIImage imageNamed:@"tabBar_essence_icon"];

UIImage *image=[UIImage imageNamed:@"tabBar_friendTrends_click_icon"];

//    不让tabbar底部有渲染的关键代码

image=[image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

vc01.tabBarItem.selectedImage=image;

// 把控制器 添加到 UITabBarController里面去

[self addChildViewController:vc01];

UIViewController *vc02=[[UIViewController alloc]init];

vc02.tabBarItem.title=@"新帖";

vc02.tabBarItem.image=[UIImage imageNamed:@"tabBar_new_click_icon"];

vc02.tabBarItem.selectedImage=[UIImage imageNamed:@"tabBar_new_click_icon"];

vc02.view.backgroundColor=[UIColor cyanColor];

[self addChildViewController:vc02];

UIViewController *vc03=[[UIViewController alloc]init];

vc03.view.backgroundColor=[UIColor blueColor];

vc03.tabBarItem.title=@"关注";

vc03.tabBarItem.image=[UIImage imageNamed:@"tabBar_friendTrends_icon"];

vc03.tabBarItem.selectedImage=[UIImage imageNamed:@"tabBar_friendTrends_click_icon"];

[self addChildViewController:vc03];

UIViewController *vc04=[[UIViewController alloc]init];

vc04.tabBarItem.title=@"我";

vc04.tabBarItem.image=[UIImage imageNamed:@"tabBar_me_icon"];

vc04.tabBarItem.selectedImage=[UIImage imageNamed:@"tabBar_me_click_icon"];

vc04.view.backgroundColor=[UIColor yellowColor];

[self addChildViewController:vc04];