如何防止imageView在ContainerView中的导航栏下延伸

请帮忙解决这个问题。我有一个viewcontroller与两个容器视图，每个指向一个单独的视图控制器。如何防止imageView在ContainerView中的导航栏下延伸

第一个viewcontroller应该显示一个图像，但顶部被导航栏截断。

我没有选中“延伸到顶部边缘”。

我的两个容器视图的viewcontrollers几乎是空的。

任何想法？

class ViewController: UIViewController { 

var teamMember:TeamMember! 

override func viewDidLoad() { 
    super.viewDidLoad() 

    if let name = teamMember.firstName { 
     title = name 
    } 
    navigationController?.view.setNeedsLayout() 
} 


override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
    if (segue.identifier == "PictureViewController") { 
     var destination = segue.destination as? UINavigationController 
     var vc = destination?.topViewController as? PictureViewController 
     vc?.teamMember = teamMember 
    } 

    if (segue.identifier == "BioContentViewController") { 
     var vc = segue.destination as? BioContentViewController 
     vc?.teamMember = teamMember 
    } 
}

编辑：我还设置自定义导航栏的项目，我不知道如果这会引起一个问题

override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
    if (segue.identifier == "PictureViewController") { 

     let backItem = UIBarButtonItem() 
     backItem.title = "Meet The Team" 
     navigationItem.backBarButtonItem = backItem 
    } 

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
    if (segue.identifier == "teamMemberDetailView") { 

     let backItem = UIBarButtonItem() 
     backItem.title = "Meet The Team" 
     navigationItem.backBarButtonItem = backItem 

     var vc = segue.destination as? TeamMemberDetailViewController 
     vc?.teamMember = teamArray[selectedTeamMemberIndex] 
    } 
}