title: How can I set custom horizontal scroll for Collection View in Swift, XCode?
body: <p>I want to set custom horizontal scroll for my CollectionView, that it will be scrolling by 1 cell (not by the whole width of my screen). </p>
  
  <p>I could set HORIZONTAL scroll, but not custom. (See screens). 
  1 screen: my extension of my collectionView for UIScrollViewDelegate. 
  *I saw, that in console (see too) "x" - my offset = 290 - it's true! But on fact it is not 290. Paging was marked in "true" 2 screen: delegate and dataSource.</p>
  
  <p><img src="https://i.stack.imgur.com/vt4ef.jpg" alt="enter image description here"></p>
  
  <p>Help, please!</p>