title: UICollectionView 3x in one row
body: <p>I'm trying to make an app that will show images in a UICollectionView, each row there must be 3 images. I've tried different a way like taking the whole view width and dividing it by 3, but it did not work for devices other than the iPhone 6+. Is there anyway I can make it such that it would be able to. One example of what I am trying to do is the instagrame timeline or suggested photos where the photos are in a 3x grid.</p>