ios - 使用 Segue，如何控制不同视图控制器中视图的可见性？

Question

我有两个通过 segue 链接的视图控制器。一个视图控制器 ( ViewController2) 在其中有多个视图，它们响应pageIndex第一个视图控制器 ( ViewController1) 中的 。所以我想要实现的是，onClick如果pageIndex == 0在 上ViewController1，其中一个视图应该变得可见。我已经多次这样做了Labels，ImageViews但是在使视图可见时，我似乎无法实现。所以我需要帮助来实现它。

视图控制器1：

  override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    if segueIdentifier(for: segue) == .reveal,
      let secondViewController = segue.destination as? ViewController2 {

      if pageIndex == 0 {
        //secondViewController.viewabc.isHidden = false

      }else if pageIndex == 1{
        //secondViewController.viewdef.isHidden = false

      }else{
        //secondViewController.viewghi.isHidden = false

      }


      secondViewController.transitioningDelegate = self

      }

  }

  @IBAction func handleTap() {
    performSegue(withIdentifier: .reveal, sender: self)


  }
}

extension ViewController1: SegueHandlerType {
  enum SegueIdentifier: String {
    case reveal
  }
}

视图控制器2：

  @IBOutlet weak var viewabc: UIView!
  @IBOutlet weak var viewdef: UIView!
  @IBOutlet weak var viewghi: UIView!

  override func viewDidLoad() {
    super.viewDidLoad()


      }

在情节提要中，所有 3 个视图都设置为隐藏

Answer 1

将 pageIndex 值从 ViewController1 传递给 ViewController2。

class ViewController1: UIViewController {
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segueIdentifier(for: segue) == .reveal,
            let secondViewController = segue.destination as? ViewController2 {
            secondViewController.transitioningDelegate = self
            secondViewController.pageIndex = pageIndex
        }
    }
}

并根据 pageIndex 值更新 ViewController2 视图

class ViewController2: UIViewController {
    var pageIndex: Int?
    @IBOutlet weak var viewabc: UIView!
    @IBOutlet weak var viewdef: UIView!
    @IBOutlet weak var viewghi: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()
        if pageIndex == 0 {
            self.viewabc.isHidden = false
        }else if pageIndex == 1{
            self.viewdef.isHidden = false
        }else{
            self.viewghi.isHidden = false
        }
    }
}