Temporarily Ignore GCController Input - UIKit

I'm setting up a player selection screen, where first player one chooses a character and then player two chooses their character. The GCControllers player indexes are assigned, and I'd like to not allow player 2 to pick while it's player one's turn, and vice versa.

Is there a way to temporarily pause input from a controller?

The selection happens with a UICollectionView.


Thanks!