RectTransform.sendChildDimensionsChange

Description

Whether the RectTransform notifies components when a child RectTransform changes dimensions.

If true, this RectTransform calls MonoBehaviour.OnChildRectTransformDimensionsChange on all components attached to the same GameObject when any of its child RectTransforms change dimensions.

using UnityEngine;

[RequireComponent(typeof(RectTransform))]
public class OnChildRectTransformDimensionsChangeExample : MonoBehaviour
{
    RectTransform rt;

    void OnEnable()
    {
        if (rt == null)
            rt = GetComponent<RectTransform>();

        rt.sendChildDimensionsChange = true;
    }

    void OnDisable()
    {
        rt.sendChildDimensionsChange = false;
    }

    void OnChildRectTransformDimensionsChange()
    {
        Debug.Log("A child RectTransform has changed dimensions.");
    }
}