UITabBarController

{

//初始化UITabBarController  (可以轻松地管理多个视图控制器)

UITabBarController *tabBarControllr = [[UITabBarController alloc] init];

//创建子视图控制器

FirstViewController *firstVC = [[FirstViewController alloc] init];

//设置标题

firstVC.tabBarItem.title=@"首页";

//设置图片---没选中时显示的图片

firstVC.tabBarItem.image= [UIImage imageNamed:@"tabbar_home"];

firstVC.tabBarItem.selectedImage= [UIImage imageNamed:@"tabbar_home_selected"];

//设置提示信息的红色小圆点

firstVC.tabBarItem.badgeValue=@"3";

UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:firstVC];

firstVC.navigationItem.title= firstVC.tabBarItem.title;

//将子视图控制器添加到tabBarControllr

//第一种方式

[tabBarControllr addChildViewController:nav];

[tabBarControllr addChildViewController:secondVC];

[tabBarControllr addChildViewController:thirdVC];

[tabBarControllr addChildViewController:fourVC];

[tabBarControllr addChildViewController:fifthVC];

//第二种方式按显示顺序放置

tabBarControllr.viewControllers= @[nav,secondVC,thirdVC,fourVC,firstVC];

//为tabBarControllr选中设置颜色

tabBarControllr.tabBar.tintColor= [UIColorcolor WithRed:253 / 255.0green:128 / 255.0blue:7 / 255.0alpha:1];

//设置tabBarControllr为根视图控制器

[UIApplicationshared Application].keyWindow.rootViewController= tabBarControllr;

//设置默认显示视图控制器页面从0开始

tabBarControllr.selectedIndex= 3;

//拼接上下层视图方式

UIImage *image1 = [UIImage imageNamed:@"tabbar_compose_button"];

UIImage *image2 = [UIImage imageNamed:@"tabbar_compose_icon_add"];

UIGraphicsBeginImageContextWithOptions(CGSizeMake(71, 49),NO, 0.0);

[image1 drawInRect:CGRectMake(0, 0, 71, 49)];

[image2 drawInRect:CGRectMake(23, 12, 25, 25)];

UIImage *image =UIGraphicsGetImageFromCurrentImageContext();

//关闭上下文

UIGraphicsGetCurrentContext();

ThirdViewController *thirdVC= [[ThirdViewController alloc]init];

//使用原始图片

thirdVC.tabBarItem.image= [imageimageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

thirdVC.tabBarItem.selectedImage= [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

//设置图片偏移量

thirdVC.tabBarItem.imageInsets=UIEdgeInsetsMake(6, 0, -6, 0);

}