UINavigationController *navigationController=[[UINavigationController alloc] initWithRootViewController:loginController];

    navigationController.title=@"登录";

    //modelForm show login

    [[YlInfoKit sharedInstance].rootViewController presentViewController:navigationController animated:YES completion:^{

       //codeing

    }];

//入栈

[self.navigationController pushViewController:createController animated:YES];

//出栈

 [self.navigationController popViewControllerAnimated:YES];