ForceTouchGestureRecognizer
A simple UIGestureRecognizer subclass that detects 3D touch.
## Usage
It's super simple. Create a ForceTouchGestureRecognizer, and add it to a view, as you would any other gesture recognizer:
let recognizer = ForceTouchGestureRecognizer(target: self, action: "forceGestureRecognizerChanged:")
view.addGestureRecognizer(recognizer)
You can optionally give the recognizer a forceThreshold – a normalized value at which the gesture should end. This defaults to 1.0 (the deepest touch possible):
recognizer.forceThreshold = 0.8
The recognizer will report its state as Changed whenever the touch's force changes. It exposes a normalized version of the touch force through its normalizedForce property.
Once the normalizedForce reaches the forceThreshold, the gesture's state will change to Ended.