title: iOS swift move elements after some hidden
body: <p>I have some question about moving elements in ScrollView, let say i have some form from few elements and button in the bottom on screen.
  This view is scrolling and now i have some problems when i need to hidden some elements on this form, elements witch will goes after that stay as is, and as a result i have some blank space on form where places some hidden elements.
  I think what is elements have Top space to options if i hidden some of them all others will move up after that but it's not.
  I can not find some way how make auto up this elements what some elements was hidden.</p>
  
  <p>Thank you</p>