[]ScrollRect设置会引起其他的UI资源无法正在显示

package

{

	

	import laya.display.Node;

	import laya.display.Sprite;

	import laya.maths.Rectangle;

	import laya.ui.Image;

	import laya.utils.Handler;

	

	import ui.TestViewUI;

	

	public class TestView extends TestViewUI

	{

		private var PATH_LEN:Number = 120.0;

		private var speed:Number = 15;

		

		private var _path:Sprite = new Sprite();

		private var arr:Array = [];

		public function TestView()

		{

			super();

			_path.pivot(0,0);

			_path.pos(a.x,a.y);

			this.addChild(_path);

			_path.rotation = Math.atan2(b.y - a.y, b.x - a.x) / Math.PI * 180;

			var len:int = Math.floor(GetPathLen()/PATH_LEN)+2;

			var p:Image;

			for(var i:int = 0;i<len;i++){

				p = new Image("test/footprint.png");

				p.pos(i*PATH_LEN,0);

				arr.push(p);

				_path.addChild(p);

			}

			//注释下面这行就正常了

			_path.scrollRect = new Rectangle(0,0,(len-1)*PATH_LEN,58);

			btn_start.clickHandler = new Handler(this,StartMove,[len]);

		}

		

		private function StartMove(len:int):void

		{

			trace("[TestView.StartMove]")

			// TODO Auto Generated method stub

			Laya.timer.loop(100,this,UpdatePath,[len]);

		}

		

		private function UpdatePath(len:int):void

		{

			// TODO Auto Generated method stub

			var show:int = len -1;

			for(var i=0;i<len;i++){

				if(arr[i]){

					arr[i].x+= speed;

					if(arr[i].x>= show* PATH_LEN){

						arr[i].x-=show* PATH_LEN;

					}

				}

			}

		}

		

		private function GetPathLen():Number

		{

			// TODO Auto Generated method stub

			var disX:Number = a.x-b.x;

			var disY:Number = a.y-b.y; 

			var p:Number = Math.sqrt(disX*disX+disY*disY);

			return p;

		}		

		

		

		

	}

}