iOS -Nav, tab jump, return

 TabBarViewController *tab =(TabBarViewController *) [UIApplicationsharedApplication].windows.firstObject.rootViewController;    

    tab.selectedViewController=tab.viewControllers[1];

self.navigationController.tabBarController.selectedIndex=0;

[self.navigationController popViewControllerAnimated:YES];

[self.navigationControllerpopToViewController:[self.navigationController.viewControllersobjectAtIndex:2] animated:YES];

[self presentViewController:nav animated:YES completion:nil];

[ self dismissViewControllerAnimated : YES completion : nil ];