layer.pinchable.threshold < number>

The minimal distance between two pointers before the gesture is recognized. Set to 0 by default.
译：在手势识别之前的两个指针之间的最小距离。默认设置为0。

layerA = new Layer
layerA.pinchable.enabled = true

# Set the minimal distance to 10 
layerA.pinchable.threshold = 10