IOS 返回根视图

1.导航栏返回根视图

[self.navigationController popToRootViewControllerAnimated:YES];

2.导航栏返回特定视图
for (UIViewController *controller in self.navigationController.viewControllers) {            if ([controller isKindOfClass:[要返回的类名 class]]) {                [self.navigationController popToViewController:controller animated:YES];            } }

3.dissmiss 返回根视图
[self.presentingViewController.presentingViewController dismissViewControllerAnimated:NO completion:nil