How to 'fit' the cells of UICollectionView FlowLayout? - uicollectionview

My aim is to create an UICollectionView with different cell sizes and all cells "fit in". There should be no empty place around the cells.
Here is an image of my Demo Application:
The sizes of t he Cells are quarter, quaver and semiquaver (1/4, 1/8 and 1/16).
So how can i realize that? How can i delete the white space around the cells to push them all together to get a look like mosaic?
thanks for your help,
brush51

Take a look at RFQuiltLayout https://github.com/bryceredd/RFQuiltLayout it is exactly what you need.

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