UGUI背景图片高度如何自适应

文字区内容少时如下图：

文字区内容多时，背景图片自动调整如下图：

可以看见蓝色背景图的高度随着文字内容的多少，高度方向上自动调整，具体做法如下：

边框图片需要图片剪切一下，防止出现拉升变形

SimpleHight_Self_Adaption脚本内容如下：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using TMPro;

/// <summary>
/// text上的consizefetter组件取消掉
/// interval 属性 更改上下的间隙。
/// </summary>
public class SimpleHight_Self_Adaption : MonoBehaviour {

    
    public TextMeshProUGUI text1;

    public Text text2;
    public float interval = 150;

    private void Start()
    {
        ChangeText("999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999");
    }
    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            ChangeText("99999999999999999999999999999ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff999999977777777777777777777777777777777777777777777777777777777777777777777777777777777777777779999999999999999999999998888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888899999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999");
        }
    }
    private void OnEnable()
    {
        text1 = GetComponentInChildren<TextMeshProUGUI>();

        text2 = GetComponentInChildren<Text>();

        (transform as RectTransform).pivot = new Vector2(0.5f,0);
    }

    public void ChangeText(string text) {

        if (text1)
        {
            text1.text = text;

            SetTitleHint(text1.preferredHeight, text1.rectTransform);
        }

        if (text2)
        {
            text2.text = text;

            SetTitleHint(text2.preferredHeight, text2.rectTransform);
        }
    }

    void SetTitleHint(float prefabHight, RectTransform text)
    {

        text.sizeDelta = new Vector2(text.sizeDelta.x, prefabHight);

        RectTransform rect = transform as RectTransform;

        rect.sizeDelta = new Vector2(rect.sizeDelta.x, Mathf.Clamp(prefabHight + interval,295,1000) );

        Canvas.ForceUpdateCanvases();
    }
}

FR：海涛高软（Hunk Xu)

UGUI背景图片高度如何自适应

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