title: how to check if UIScrollView content doesn't need to use scroll
body: <p>My problem is I need to change the label text color below my scroll view if the content of my scroll view is not all visible.</p>
  
  <p><strong>For example:</strong> I have a label colored red, if all the content of the scroll view can be seen on the screen(not using scroll at all), and the label colored blue if all the content inside of my scroll view is not visible. how to do it programmatically? </p>
  
  <p><strong>NOTE: I have a contentView -> scrollView (programmatically) -> stackView (programmatically).
  (stackview inside scrollview and scrollview inside contentview. and a label below the content view)</strong></p>
  
  <p>Thanks.</p>