NGUI 3.8.2 UITexture Flicker

[vincentmmc]

I made a product list by using NGUI 3.8.2 Unity 5.2.3.
When i change the product texture ,all textures are flickering.
The strange thing is sometimes it flickering,but sometimes not!
It's very hard to figure out,can someone help me?

Here is my hierarchy:
UI ROOT
--UIPanel
----ScrollView
------ItemGroup
--------Item1
----------UITexture
--------Item2
----------UITexture
--------Item3
----------UITexture

The item script:

1. public class ProductItem
2. {
3.     public void SetData(ProductData param)
4.     {
5.          
6.          //set name,set price...
7.          ...
8.          ...
9.  
10.          //set texture
11.          StartCoroutine(LoadImage(param.url));
12.     }
13.  
14.     IEumerator LoadImage(String url)
15.     {
16.         WWW www=new WWW(url);
17.         yield return www;
18.         if(www.isDone)
19.         {
20.              transform.FindChild("UITexture").getComponent<UITexture>().mainTexture=www.texture;
21.         }
22.     }
23. }
24.  

----------
I try to call UIPanel.Refresh() but it does not work;

[ArenMook]

You can force-update draw calls immediately using NGUITools.ImmediatelyCreateDrawCalls(widget.gameObject), where 'widget' is your UITexture.