iOS中 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];

aTabBarItem.title = @"小韩哥";
bTabBarItem.title = @"iOS编程";
cTabBarItem.title = @"ios开发";
dTabBarItem.title = @"苹果系统";

[aTabBarItem setFinishedSelectedImage:[UIImage imageNamed:@"aa_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"1.png"]];
[bTabBarItem setFinishedSelectedImage:[UIImage imageNamed:@"bb_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"2.png"]];
[cTabBarItem setFinishedSelectedImage:[UIImage imageNamed:@"cc_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"3.png"]];
[dTabBarItem setFinishedSelectedImage:[UIImage imageNamed:@"dd_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"4.png"]];

 UIImage* tabBarBackground = [UIImage imageNamed:@"tabbar1.png"];
 [[UITabBar appearance] setBackgroundImage:[tabBarBackground resizableImageWithCapInsets:UIEdgeInsetsZero]];
 [[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"tabbar.png"]];

[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                   [UIColor grayColor], UITextAttributeTextColor,
                                                   nil 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 nil] forState:UIControlStateHighlighted];

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