Weird behavior when trying to add an index to a button

Questions & Answers
1

Sometimes I like to index my GameObjects (for example, if I have several of them as children of another Gameobject). I created a custom script that has a single variable index:

IndexedGameObject

public class IndexedGameObject : MonoBehaviour
{
    public int index;
    void Start()
    {
        index = 0;
    }
}

I was trying to create several buttons via code and mark them each with an index when I came across some behavior I didn’t understand.

for (int i = 0; i < 5; i++)
{
    GameObject testButton = Resources.Load<GameObject>("Prefabs/testButton");
    GameObject instantiatedTestButton = Instantiate(testButton, Vector3.zero, Quaternion.identity);
    instantiatedTestButton.transform.SetParent(craftingScrollViewContent.transform, false);
    int currentIndex = i;
    instantiatedTestButton.GetComponent<Button>().onClick.AddListener(delegate { MyTestButton(instantiatedTestButton, currentIndex); });
    instantiatedTestButton.GetComponent<IndexedGameObject>().index = currentIndex;
}

Whenever I click my buttons in game, they run this function:

public void MyTestButton(GameObject button, int index)
{
    print(button.GetComponent<IndexedGameObject>().index);
    print(index);
}

Interestingly, print(button.GetComponent<IndexedGameObject>().index); always prints 0, and print(index); prints the ith index (correctly).

Why isn’t the index that’s part of my IndexedGameObject updating?

2

probably because the index at ‘button.Getcomponent().index’ is different than ‘print(index)’?

The index parameter won’t be going in ‘button.Getcomponent().index’