[Unity] Auto height increase based on number of lineCount in TMP_Text

UIDialogTutorial.cs

using UnityEngine;
using UnityEngine.UI;
using TMPro;

#if UNITY_EDITOR
using UnityEditor;
#endif

namespace Game
{
    [ExecuteAlways] // Allow execution in Editor and Play mode
    public class UIDialogTutorial : MonoBehaviour
    {
        [SerializeField] private RectTransform rectTransform;
        [SerializeField] private TMP_Text textContent;


        [Header("Dialog Settings")]
        [SerializeField] private float minUIHeight = 210f;


        /// <summary>
        /// Resizes dialog height based on text content
        /// </summary>

        private byte currentLineCountAtMinHeight = 2;
        public void SetupHeight()
        {
            if (textContent == null || rectTransform == null) return;
            textContent.ForceMeshUpdate();
            Canvas.ForceUpdateCanvases();

            // Now preferredHeight is valid
            float preferredHeight = textContent.GetPreferredValues(textContent.text, textContent.rectTransform.rect.width, 0).y;
            int lineCount = textContent.textInfo.lineCount;
            float heightExtraPerLine = preferredHeight / lineCount;

            // Convert to line count
            float newHeight =  Mathf.Max(minUIHeight, minUIHeight + (lineCount - currentLineCountAtMinHeight) * heightExtraPerLine);
            rectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, newHeight);
        }

#if UNITY_EDITOR
        // Automatically update in editor when something changes (to help debugging)
        private void OnValidate()
        {
            Debug.Log("OnValidate");
            // Delay to next frame so TMP updates first
            EditorApplication.delayCall += () =>
            {
                if (this != null) SetupHeight();
            };
        }
#endif
    }
}