Scroll ScrollRect to the first entry if all entrys loaded from Webserver

Hi guys,

I am loading a txt file from my webserver with update informations. In my UI I have a ScrollRect. In my script I load the file, split it to an string array and in an foreach loop I instantiate for every entry a new Text UI element and set the content Rect of my ScrollRect as parent.

The problem is, that the ScrollRect beginns at the bottom. I have tested to set it to the top with

Code (CSharp):

1.  scrollrect.normalizedPosition = new Vector2(0, 1);

but nothing happens.

Here is the complete code:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using UnityEngine.UI;
4. using System;
5. public class UpdateInformater : MonoBehaviour {
6.     private string[] content;
7.     public Transform textBox;
8.     public Text infoText;
9.     public ScrollRect scrollrect;
10.  
11.     // Use this for initialization
12.     void Start () {
13.         string url = "http://example.com/update_informations.txt";
14.         WWW www = new WWW(url);
15.         StartCoroutine(WaitForRequest(www));
16.        
17.     }
18.     IEnumerator WaitForRequest(WWW www)
19.     {
20.         yield return www;
21.         // check for errors
22.         if (www.error == null)
23.         {
24.             content = www.text.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.RemoveEmptyEntries);
25.  
26.             foreach (string cont in content) {
27.                 Debug.Log(cont);
28.                 Text updateInfo = Instantiate(infoText, new Vector2(0,0), Quaternion.identity) as Text;
29.                 if (cont != "#paragraph")
30.                 {
31.                     updateInfo.text = cont;
32.                 }
33.                 else {
34.                     updateInfo.text = "- - - - - - - - - - - \n - - - - - - - - - - - - ";
35.                 }
36.                
37.                 updateInfo.transform.SetParent(textBox, false);
38.              
39.             }
40.             scrollrect.normalizedPosition = new Vector2(0, 1);
41.  
42.         }
43.         else {
44.             Debug.Log("WWW Error: " + www.error);
45.         }
46.      
47.     }
48. }
49.  

Any ideas, how to solve the problem?

Cheers

 

You probably have to wait a frame before setting the position or do a LayoutRebuilder.ForceRebuildLayoutImmediate on the content RectTransform before you can set the position.

 

The position you want to change is the AnchoredPosition, you should do this in a LateUpdate call.

Check the various ScrollRect implementations and extensions in the UI Extensions project (link in sig) for more detail.
What you want is the localposition of the first child index really, applied to the Context GO of the ScrollRect