title: UICollectionView - How to update all cells with change from one cell
body: <p>I have a <code>CollectionView</code> and inside each <em>cell</em> of this <code>collectionView</code> there is one <code>textField</code>. </p>
  
  <p>If all content of the <code>textfield</code> is <code>nil</code>, when I change content of one <code>textfield</code> (for example <strong>cell_1</strong>) all other <code>textfield</code>s will auto update content with <strong>value</strong> like the content of <code>textfield</code> in <strong>cell_1</strong>.</p>
  
  <p>I have tried with <code>collectionView.visibleCells</code> but it does not work properly for my scene.</p>
  
  <p>Is there any way that I can change one cell then update for all cells in <code>CollectionView</code>?</p>
  
  <p>Please help. Thanks in advance!</p>