MenuViewController * menuViewController = [[MenuViewController alloc] init];

    menuViewController.delegate = self;

    UIViewController * controller = self.view.window.rootViewController;

    controller.modalPresentationStyle = UIModalPresentationCurrentContext;

    menuViewController.view.backgroundColor = [UIColor clearColor];

    menuViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;

    UINavigationController * jackNavigationController = [[UINavigationController alloc] initWithRootViewController:menuViewController];

imageNamed:@"navigationBar_bg.png"] forBarMetrics:UIBarMetricsDefault];

    [self presentViewController:jackNavigationController animated:YES completion:^{

     }];

这样你就可以在present出来的viewController里畅通使用push方法退出其他界面了。

对了，

UIViewController * controller = self.view.window.rootViewController;

    controller.modalPresentationStyle = UIModalPresentationCurrentContext;

这两句是在第二个UIViewController中可以设置alph看到第一个UIViewController的界面；也就是第一个UIViewController作为背景了，，，