Question ScrolLTo() method doesnt work

Hi, Unity version 2022.2.6.f1 and this is my code:

Code (CSharp):

1. public class NewBehaviourScript : MonoBehaviour
2. {
3.     // Start is called before the first frame update
4.     void Start()
5.     {
6.  
7.         ScrollView sw = GetComponent<UIDocument>().rootVisualElement.Q<ScrollView>();
8.         VisualElement element = GetComponent<UIDocument>().rootVisualElement.Q<VisualElement>("bu");
9.  
10.         Debug.Log("sw: " + sw.name);
11.         Debug.Log("element: " + element.name);
12.         sw.ScrollTo(element);
13.     }
14. }

My test.uxml


When I start the game, It doesnt scroll


Can you help me please. I also tried 2021 LTS version

 

You are right, thank so much. I prefered solving it with async await. But your solution is more proper way to handle the situation. I will leave my solution too anyway:

Code (CSharp):

1. public class NewBehaviourScript : MonoBehaviour
2. {
3.     // Start is called before the first frame update
4.     async void Start()
5.     {
6.         ScrollView sw = GetComponent<UIDocument>().rootVisualElement.Q<ScrollView>();
7.         VisualElement element = GetComponent<UIDocument>().rootVisualElement.Q<VisualElement>("bu");
8.         await Task.Delay(250); // wait 0.25s before scrolling
9.         sw.ScrollTo(element);
10.     }
11. }

 

Just use

Code (CSharp):

1. IEnumerator Start()
2.  
3. yield return new WaitForEndOfFrame()

 

Or use UniTask and you can just do:

Code (CSharp):

1. await UniTask.Yield(PlayerLoopTiming.PreLateUpdate);

in async code.

 

Yes, I think this is another proper solution. But with only a handicap that GetComponent<>() needs MonoBehaviour. In my case I dont want to inherit but I still use your solution because I already keep root of visual asset source in a variable of a singleton named UIManager. So my final code is here:

Code (CSharp):

1. public class NewBehaviourScript
2. {
3.     ScrollView sw; // Start is called before the first frame update.
4.     IEnumerator Start()
5.     {
6.         sw = UIManager.root.Q<ScrollView>();
7.         //await Task.Delay(250);
8.         yield return new VisualElement element = sw.contentContainer.Q<VisualElement>("bu");
9.         // await Task.Delay(250); // wait 0.25s before scrolling
10.  
11.         // sw.ScrollTo(element); // It also works, it makes element to seem in viewport
12.  
13.         // I aimed to scroll center and it worked
14.         sw.verticalScroller.value = sw.verticalScroller.highValue / 2;
15.         sw.horizontalScroller.value = sw.horizontalScroller.highValue / 2;
16.     }
17.  
18. }
19.  
20.  

And my UIManager script taht is attached to the UI Document object in the scene:

Code (CSharp):

1. public class UIManager : MonoBehaviour
2. {
3.     public static VisualElement root;
4.  
5.     private void Start()
6.     {
7.         root = GetComponent<UIDocument>().rootVisualElement;
8.     }
9. }

 

Thank you! I don't have enough knowledge of "await async" s in unity and this is an important information for me, I will keep it in mind.