在视图层次结构中查找和隐藏视图

Question

我有一个给定的视图层次结构，如下所示：

View F
  > View C
    > View D
      > View A
      > View P
    > View B

如何隐藏View C？

我想出了以下逻辑。但是，我想知道这样做是否正确？

func givenViews (view1 : UIView , view2: UIView)
{
    aViews = [UIView]()
    bViews = [UIView]()

   var aView = view1
   var bView = view2


   // first put all superviews into array
   while aView.superview != nil
   {
    aViews.append(aView)
    aView = aView.superview
   }

   while bView.superview != nil
   {
    bViews.append(bView)
    bView = bView.superview
   }

   // find the first common view which is C and hide it
   for a in aViews
   {
     for b in bViews
     {
       if a == b
       {
        a.hidden = true
        break 
       }
     }
   }
}

Answer 1

如果我正确理解您的代码，您将试图隐藏第一个共同祖先。

如果是这样，那么您可以像这样使用isDescendant(of:)：

func givenViews(view1: UIView, view2: UIView) -> UIView? {
    if view2.isDescendant(of: view1) { return view1 }

    var aView: UIView? = view1
    while let testView = aView, !view2.isDescendant(of: testView) {
        aView = testView.superview
    }

    return aView
}