3.0.8 f7 - ScrollBar localPosition is NaN

[doggan]

I am getting the following error when clicking on a Scroll Bar whose contents are completely contained in a subpanel:

1. transform.localPosition assign attempt for 'SubPanel' is not valid. Input localPosition is { 0.000000, NaN, 0.000000 }.
2. UnityEngine.Transform:set_localPosition(Vector3)

I am able to repro it in the NGUI Example 9 - Quest Log scene.

Steps:
1). Open the Example 9 - Quest Log scene.
2). Find the "SubPanel" game object, and change it's UIScrollView show condition to "Always".
3). Press Play and enter game view.
4). Expand the top two quests so that the scroll bar foreground shrinks.
5). Collapse the two expanded quests so that the scroll bar foreground expands to full height.
6). Click on the scroll bar and try to drag and the error will occur.

Thanks.

[ArenMook]

Thanks, I will look into this when I return on the 16th.

[drawmaster77]

I am having the same issue, I just updated to 3.0.9.f2 and it's still happening.

[ArenMook]

Thanks for the reminder. You can fix it by changing UIScrollBar.LocalToValue function to this one:

1.         protected override float LocalToValue (Vector2 localPos)
2.         {
3.                 if (mFG != null)
4.                 {
5.                         float halfSize = Mathf.Clamp01(mSize) * 0.5f;
6.                         float val0 = halfSize;
7.                         float val1 = 1f - halfSize;
8.                         Vector3[] corners = mFG.localCorners;
9.  
10.                         if (isHorizontal)
11.                         {
12.                                 val0 = Mathf.Lerp(corners[0].x, corners[2].x, val0);
13.                                 val1 = Mathf.Lerp(corners[0].x, corners[2].x, val1);
14.                                 float diff = (val1 - val0);
15.                                 if (diff == 0f) return value;
16.  
17.                                 return isInverted ?
18.                                         (val1 - localPos.x) / diff :
19.                                         (localPos.x - val0) / diff;
20.                         }
21.                         else
22.                         {
23.                                 val0 = Mathf.Lerp(corners[0].y, corners[1].y, val0);
24.                                 val1 = Mathf.Lerp(corners[3].y, corners[2].y, val1);
25.                                 float diff = (val1 - val0);
26.                                 if (diff == 0f) return value;
27.  
28.                                 return isInverted ?
29.                                         (val1 - localPos.y) / diff :
30.                                         (localPos.y - val0) / diff;
31.                         }
32.                 }
33.                 return base.LocalToValue(localPos);
34.         }

[drawmaster77]

thank you that fixed it.