On_PinchIn用来检测为挤压   

float zoom = Time.deltaTime * gesture.deltaPinch/25;

Vector3 scale = transform.localScale ;

if (scale.x - zoom>0.1)

transform.localScale = new Vector3( scale.x - zoom, scale.y -zoom,1f);

缩小

On_PinchOut用来检测扩张

float zoom = Time.deltaTime * gesture.deltaPinch/25;

Vector3 scale = transform.localScale ;

if ( scale.x + zoom<3 )

transform.localScale = new Vector3( scale.x + zoom, scale.y +zoom,1f);

放大

Twist  用来旋转gesture.twistAngle

On_Drag  拖动

gesture.GetTouchToWordlPoint（获得当前点的位置）

if (gesture.touchCount==1){

Vector3 position = gesture.GetTouchToWordlPoint(1);

if (newPivot){

deltaPosition = position - transform.position;

newPivot = false;

}

transform.position = position - deltaPosition;

}