I'm trying to implement Peek and Pop into an app. There's only one issue- I don't have the option with my current segue setup:
What am I doing wrong, and why do I not have this option?
How are you establishing your segue? This is poorly documented, but setting up 3D Touch segues from a Storyboard appears to be unavailable if you're using a Manual Segue (controller to controller) versus an Action Segue (object to controller).
To illustrate, here's a Manual Segue with 3D Touch segues absent:
Here's an Action Segue with 3D Touch segues present: