Collectionview Cell spacing

how can i add cell spacing to my cells . i need a space of 10 after 1st column and 5 after each column. please help.

<img width="621" alt="screen shot 2016-12-02 at 2 56 28 am" src="https://cloud.githubusercontent.com/assets/1468654/20814337/02e00564-b83b-11e6-997c-bab9399d73bb.png">
