Do not understand Scrollview

[Shemamforash]

So I've read as much documentation/forum posts & class info as I can find, but I simply cannot get my scrollview to work. A summary of how it is supposed to work:

- I have a list that has a variable size depending on the race of the player.
- I want to be able to display each of these items in a scrollview, so I figured I would get the length of the list and then do gameobject.AddChild(myprefab) to add as many labels as I needed into the scrollview. That works fine, I can see in the inspector that it does indeed add the correct number of object at start up.
- The prefab itself has a sprite for a background, a label to display text, a UIButton & Box Collider (since it needs to be clickable), and finally a UIDrag Scroll View where the scroll view variable is set to the parent (which contains the scrollview) at runtime.

For some reason when I hit play, the scrollview will be populated by the labels, but all the sprites will merge onto eachother and overlap, I am also unable to scroll through the list with the scroll wheel, and the button functionality does not exist. I am slightly at a loss as to how all this is supposed to work, as I have managed to get scrollviews to work before, and I've probably watched that walkthrough video about 5 or 6 times now.

Here is my Start() code

1. for(int i = 0; i < techTreeScript.listOfImprovements.Count; ++i)
2.                 {                      
3.                         GameObject improvement = NGUITools.AddChild(scrollviewWindow, scrollviewButton); //Scrollviewwindow is gameobject containing scrollview, scrollviewbutton is the button prefab
4.  
5.                         improvement.GetComponent<UISprite>().depth = 20; //Depth set to 20 to ensure I can see it, will be changed when scrollview actually works
6.  
7.                         improvement.GetComponent<UILabel>().depth = 20;
8.  
9.                         improvement.GetComponent<UIDragScrollView>().scrollView = scrollviewWindow.GetComponent<UIScrollView>(); //Assigning scrollview variable of prefab
10.  
11.                         improvement.name = techTreeScript.listOfImprovements[i].improvementName; //Just naming the object in the hierarchy
12.  
13.                         improvement.GetComponent<UILabel>().text = techTreeScript.listOfImprovements[i].improvementName + "\n" + techTreeScript.listOfImprovements[i].improvementCost; //Add label text
14.  
15.                         improvementsList.Add (improvement); //Add improvement into a list so I can enable/disable improvements as needed
16.  
17.                         NGUITools.SetActive(improvement, false); //Default set improvement to false so it won't be shown in scrollview unless needed
18.  
19.                         scrollviewWindow.GetComponent<UIGrid> ().Reposition (); //Reposition in grid
20.                         scrollviewWindow.GetComponent<UIScrollView>().ResetPosition(); //Reset scrollview
21.                 }

And here is the code when I set the scrollview object to active:

1. if(systemListConstructor.systemList[selectedSystem].planetsInSystem[selectedPlanet].planetColonised == true)
2.                 {
3.                         NGUITools.SetActive(scrollviewWindow, true); //Display the scrollview
4.  
5.                         Vector3 position = new Vector3(planetElementList[selectedPlanet].spriteObject.transform.position.x - 0.5f, //Move it to an easy to see position
6.                                                        planetElementList[selectedPlanet].spriteObject.transform.position.y,
7.                                                        planetElementList[selectedPlanet].spriteObject.transform.position.z);
8.  
9.                         scrollviewWindow.transform.position = position;
10.  
11.                         scrollviewWindow.GetComponent<UIScrollView> ().Scroll (Time.deltaTime); //How does this even work?
12.  
13.                         for(int i = 0; i < techTreeScript.listOfImprovements.Count; ++i)
14.                         {
15.                                 if(techTreeScript.listOfImprovements[i].hasBeenBuilt == true || techTreeScript.listOfImprovements[i].improvementLevel > techTreeScript.techTier
16.                                    || techTreeScript.listOfImprovements[i].improvementCategory == enemyOneTurnScript.playerRace
17.                                    || techTreeScript.listOfImprovements[i].improvementCategory == enemyTwoTurnScript.playerRace)
18.                                 {
19.                                         if(improvementsList[i].activeInHierarchy == true)
20.                                         {
21.                                                 NGUITools.SetActive(improvementsList[i], false); //If tech has been built it doesnt need to be shown in the scrollview
22.                                         }
23.                                         continue;
24.                                 }
25.  
26.                                 NGUITools.SetActive(improvementsList[i], true); //If tech has not been built, set it to active so it can be shown in the scrollview
27.                                 scrollviewWindow.GetComponent<UIGrid> ().Reposition (); //Reposition grid contents
28.                                 scrollviewWindow.GetComponent<UIScrollView>().ResetPosition(); //Reset scrollview position
29.                         }
30.                 }

Finally I have included some images to show how my scrollview and stuff is set up.
Thanks v much

[Nicki]

I would split the prefabs up in a hierarchy, with

*GameObject
**Sprite
**Label

And keep your logic and collider on the GameObject with serializedfields to the sprite and label for any changes you need to do .

NGUI gets a little dodgy when you put both labels and sprites on the same game object.

[Shemamforash]

Ah okay cool, I'll see how that turns out

[kitgui]

NGUITools.AddChild is recommended instead of gameObject.AddChild, as it makes sure your hierarchy still works for NGUI

[Shemamforash]

Yep that worked! Thanks