从子ViewController检选

我遇到了将子视图控制器“ B”呈现到另一个视图控制器“ A”的情况。视图控制器“ B”具有5个按钮,可将按钮锁定(按入)到第三个视图控制器“ C”。问题是一旦我进入视图控制器“ C”,我希望能够使用展开命令从C-> A转到中间,而不会出现B。

    // view controller A class

    class AViewController: UIViewController {        

            @IBAction func goToViewControllerB(_ sender: UIButton) {
                   let viewControllerB = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "viewControllerB_ID") as! BViewController
                   self.addChild(viewControllerB)
                   viewControllerB.view.frame = self.view.frame
                   self.view.addSubview(viewControllerB.view)
                   viewControllerB.didMove(toParent: self)
           }

           @IBAction func unwindToStart(segue: UIStoryboardSegue) {
                  print("back from view controller C!")
           }

   }

   //view controller B class

   class BViewController: UIViewController {

           override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
                  if let identifier = segue.identifier {
                        switch identifier {
                              case "segueFromBToC_1":
                                    if let destVC = segue.destination as? CViewController {
                                        //pass data
                                    }
                              // ... cases 2-4
                              case "segueFromBToC_5":
                                    if let destVC = segue.destination as? CViewController {
                                        //pass data
                                    }
                              default: break
                         }                   
                  }
          }

    }

    // empty CViewController class

我知道将以下代码放入我的视图控制器B类中会将其从父视图控制器“ A”中删除,但是由于“ B”不存在,我无法再将其从“ B”选择为“ C” 。

   self.view.removeFromSuperview()
   self.removeFromParent()
   self.willMove(toParent: nil)

I was wondering where I should put the above code or if I should segue from a child view controller at all? I also haven't used navigation controllers as I don't know how to implement them with a child view controller. Should I have @IBAction outlets for each of the 5 buttons and put the above code in there?

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  • 衮开、
    衮开、 回复

    UPDATE: I was able to fix it by detaching the 5 push segues from the buttons and have each of the 5 push segues go directly from view controller B to view controller C. I then had an @IBAction for each button where I had the following code in view controller B:

        @IBAction func segueFromBToCUsingButton1(_ sender: UIButton) {
              self.performSegue(withIdentifier: "segueFromBToC_1", sender: self)
              self.view.removeFromSuperview()
              self.removeFromParent()
              self.willMove(toParent: nil)
        }
    
        // repeat above code for the four other buttons
    

    不确定这是否是最佳做法。