The new Force Touch trackpad adds a whole new dimension to user interactions. OS X 10.11 introduces system controls that support pressure behaviors. Understand how to integrate with these behaviors and support them in custom controls. See how to use the Taptic Engine to provide subtle physical feedback based on trackpad input. Hear best practices for adopting new swiping gestures.
WWDC 2015 > App Frameworks > Adopting New Trackpad Features