ios - 需要 UISegmentControl 和 UINavigationController 来推送 ViewControllers

Question

我有三个 UIViewController 和一个带有 UISegmentControl 的单独视图控制器，我必须使用导航控制器推送 3 个视图控制器。I want all these views to appear below UISegmentControl when any segmentcontrol is selected. 我尝试了推送和弹出逻辑，但无法得到正确的结果。以下是一个控制器的代码 -

-(IBAction)valueChanged:(id)sender{

segmentControl=(UISegmentedControl*)sender;

if (segmentControl.selectedSegmentIndex==1) {

    firstView = [self.storyboard instantiateViewControllerWithIdentifier:@"FirstTopViewController"];

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

    [self.navigationController popViewControllerAnimated:NO];

    self.navigationController.navigationItem.titleView=segmentControl;


    NSLog(@"1");
    }
}

谁能告诉我我在这里做错了什么？