我们在做项目市经常遇到这样的需求：点击按钮跳转到购物车或者首页。方法如下：
self.tabBarController.selectedIndex = 0;//更改selectedIndex选择tabbar的选项
[self.navigationController popToRootViewControllerAnimated:YES];
或者
[self.navigationController popToRootViewControllerAnimated:YES];
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
appDelegate.window.rootViewController = [[TabBarViewController alloc]init];