单个UICollectionViewController中的多个自定义单元格，使用NavigationBarButton循环

I had Previously created three different UICollectionView's and placed three different custom cells into each of them linking them together with a simple tab bar button. After some Help i have managed to narrow the code down to just one UICollectionViewController and now i simply just need to know how to toggle between each custom cell via a NavigationBarButton.I had Previously created three different UIColl