iOS多次push,返回指定根模块

方法一

self.tabBarController.selectedIndex = 2;
[self.navigationController popToRootViewControllerAnimated:YES];

方法二

MyFunTabBarController *myFunVc = [[MyFunTabBarController alloc] init];
[self presentViewController:myFunVc animated:YES completion:nil];
self.view.window.rootViewController = myFunVc;

方法三

AppDelegate *appdelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
MyFunTabBarController *myFunVc = [[MyFunTabBarController alloc] init];
myFunVc.selectedIndex = 3;
appdelegate.window.rootViewController = myFunVc;