internal static UIView ClosestCommonAncestor(this UIView a, UIView b)
{
var aSuper = a.Superview;
var bSuper = b.Superview;
if (ReferenceEquals(a, b))
{
return(a);
}
if (ReferenceEquals(a, bSuper))
{
return(a);
}
if (ReferenceEquals(b, aSuper))
{
return(b);
}
if (ReferenceEquals(aSuper, bSuper))
{
return(aSuper);
}
var ancestorsOfA = a.Ancestors();
var ancestorsOfB = b.Ancestors();
foreach (var ancestor in ancestorsOfB)
{
if (ancestorsOfA.Contains(ancestor))
{
return(ancestor);
}
}
return(null);
}