ThreeKingdomsSlingshot/Assets/Scripts/OutGame/UI/UiFitHeight.cs

using UnityEngine;

namespace TKS.OutGame
{
    /// <summary>
    /// 본문 높이 맞춤(PD #1100) — 부모가 기준 높이보다 낮으면(3:4 등) 같은 비율로 줄이고 가로는 부모를 꽉 채운다 · 높거나 같으면 부모와 같은 크기(기존 늘림과 같음).
    /// </summary>
    public class UiFitHeight : MonoBehaviour
    {
        public float designHeight = 1546f;
        Vector2 last = new Vector2(-1f, -1f);

        void OnEnable()
        {
            last = new Vector2(-1f, -1f);
            Apply();
        }

        void Update()
        {
            Apply();
        }

        public float Scale
        {
            get { return transform.localScale.x; }
        }

        void Apply()
        {
            var rt = (RectTransform)transform;
            var parent = rt.parent as RectTransform;
            if (parent == null || designHeight <= 0f) return;
            var size = parent.rect.size;
            if (size == last || size.y <= 0f) return;
            last = size;
            float s = Mathf.Min(1f, size.y / designHeight);
            rt.anchorMin = rt.anchorMax = new Vector2(0.5f, 1f);
            rt.pivot = new Vector2(0.5f, 1f);
            rt.localScale = new Vector3(s, s, 1f);
            rt.sizeDelta = s < 1f ? new Vector2(size.x / s, designHeight) : size;
            rt.anchoredPosition = Vector2.zero;
        }
    }
}