If you’ve created a new UICollectionViewCell object and XCode doesn’t seem to want to let you control drag from your storyboard or xib to your class, select the cell you want to drag from and set the ‘Custom Class’ property.

Screen Shot 2017-01-09 at 8.27.46 AM.png

This will then enable you to control drag.

Screen Shot 2017-01-09 at 8.28.57 AM.png