UITabBarController中自定义UITabBar

1.创建多个视图控制器，放如UITabBarController中

AViewController  *aa = [[AViewController alloc] init];
UINavigationController* ayNav = [[UINavigationController alloc]initWithRootViewController:aa];

BViewController  *bb = [[BViewController alloc] init];
UINavigationController* bNav = [[UINavigationController alloc]initWithRootViewController:bb];

CViewController  *cc = [[CViewController alloc] init];
UINavigationController* cNav = [[UINavigationController alloc]initWithRootViewController:cc];

DViewController  *dd = [[DViewController alloc] init];
UINavigationController* dNav = [[UINavigationController alloc]initWithRootViewController:dd];
2.初始化tabbar
UITabBarController *tabBarController = [[UITabBarController alloc]init];
tabBarController.delegate=self;
tabBarController.viewControllers=[[NSArray alloc]initWithObjects:ayNav,bNav,cNav,dNav,nil];

3.获取到tabBarController中的tabBar，在从tabBar中获取到每个items

UITabBar *tabBar = tabBarController.tabBar;
UITabBarItem *aTabBarItem = [tabBar.items objectAtIndex:0];
UITabBarItem *bTabBarItem = [tabBar.items objectAtIndex:1];
UITabBarItem *cTabBarItem = [tabBar.items objectAtIndex:2];
UITabBarItem *dTabBarItem = [tabBar.items objectAtIndex:3];

4. 设置tabBar中items的标题

aTabBarItem.title = @"aaa";
bTabBarItem.title = @"bbb";
cTabBarItem.title = @"ccc";
dTabBarItem.title = @"ddd";

5.设置tabBar中items的图片

[aTabBarItem setFinishedSelectedImage:[UIImage imageNamed:@"aa_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"aa.png"]];
[bTabBarItem setFinishedSelectedImage:[UIImage imageNamed:@"bb_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"bb.png"]];
[cTabBarItem setFinishedSelectedImage:[UIImage imageNamed:@"cc_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"cc.png"]];
[dTabBarItem setFinishedSelectedImage:[UIImage imageNamed:@"dd_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"dd.png"]];

6.设置tabBar的背景图片

// Change the tab bar background
UIImage* tabBarBackground = [UIImage imageNamed:@"tabbarbg.png"];
[[UITabBar appearance] setBackgroundImage:[tabBarBackground resizableImageWithCapInsets:UIEdgeInsetsZero]];
[[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"tabbar_selected.png"]];

7.改变tabBar中items上字体的颜色

// Change the title color of tab bar items
[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
[UIColor grayColor], UITextAttributeTextColor,
nil] forState:UIControlStateNormal];
UIColor *titleHighlightedColor = [UIColor colorWithRed:153/255.0 green:192/255.0 blue:48/255.0 alpha:1.0];
[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
titleHighlightedColor, UITextAttributeTextColor,
nil] forState:UIControlStateHighlighted];

8.将tabBarController加入window中

self.window.rootViewController = tabBarController;
[self.window makeKeyAndVisible];