后退按钮有问题

Question

我的后退按钮出了问题。我有2个VC。每个VC都有自己的后退按钮（它们不是默认值，它们被添加为左栏按钮项。当我从VC1（与Home View Controller链接，未显示）连接到VC2时，我看到VC2但是当我回来时到VC1我看到VC1的导航栏和VC2的视图。我需要做什么？ 我也尝试添加func但它没有帮助。

override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.identifier == "comeBack" {
        let backVC = self.storyboard?.instantiateViewController(withIdentifier: "CollectionVC") as! RecipeCollectionViewController
        self.navigationController?.pushViewController(backVC, animated: true)
    }
}

Answer 1

使用它来推送VC1到VC2

let vc = self.storyboard?.instantiateViewControllerWithIdentifier("VC2") as! VC2
self.navigationController?.pushViewController(vc, animated: true)

并将其用于从VC2到VC1的返回

self.navigationController?.popViewControllerAnimated(true) 

Answer 2

用于弹出特定视图控制器

 let viewControllers: [UIViewController] = self.navigationController!.viewControllers
  for vc in viewControllers {
  if VC is YourViewController {
    self.navigationController!.popToViewController(vc, animated: true)
 }
}

如果弹出前一个控制器而不是使用

self.navigationController?.popViewControllerAnimated(true)