Sends a pinching gesture with two touches.
- Xcode 7.2+
The scale of the pinch gesture. Use a scale between 0 and 1 to "pinch close" or zoom out and a scale greater than 1 to "pinch open" or zoom in.
The velocity of the pinch in scale factor per second.
The system makes a best effort to synthesize the requested scale and velocity, but absolute accuracy is not guaranteed. Some values may not be possible based on the size of the element's frame; these will result in test failures.