code snippet not working

i tried to add simple touch and drag code snippet to a symbol for air to ios.

when testing app on iphone x it doesn't work. why?

/* Touch and Drag Event

Allows the object to be moved by holding and dragging the object.

*/

Multitouch.inputMode = MultitouchInputMode.TOUCH_POINT;

green.addEventListener(TouchEvent.TOUCH_BEGIN, fl_TouchBeginHandler_2);

green.addEventListener(TouchEvent.TOUCH_END, fl_TouchEndHandler_2);

var fl_DragBounds_2:Rectangle = new Rectangle(0, 0, stage.stageWidth, stage.stageHeight);

function fl_TouchBeginHandler_2(event:TouchEvent):void

{

event.target.startTouchDrag(event.touchPointID, false, fl_DragBounds_2);

}

function fl_TouchEndHandler_2(event:TouchEvent):void

{

event.target.stopTouchDrag(event.touchPointID);

}