unity文本大小自适应文本框第一种方法

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using System.Collections;
using System.Collections.Generic;
using UnityEditor.VersionControl;
using UnityEngine;
using UnityEngine.UI;

public class Test : MonoBehaviour
{
    public enum StartAxisType
    {
        Horizontal,
        Vertical
    }

    public bool mAdaptiveSize = false;
    public StartAxisType mStartAxis = StartAxisType.Horizontal;
    public int mBeginFontSize;
    public Vector2 mRectSize;
    public Text mText;
    void Awake()
    {
        mRectSize = transform.GetComponent<RectTransform>().sizeDelta;
        mText = transform.GetComponent<Text>();
        mBeginFontSize = mText.fontSize;
    }

    void Start()
    {
        if (!mAdaptiveSize)
            return;
        switch (mStartAxis)
        {
            case StartAxisType.Horizontal:
                while (mText.preferredWidth > mRectSize.x)
                {
                    mText.fontSize -= 1;
                }
                break;
            case StartAxisType.Vertical:
                while (mText.preferredHeight > mRectSize.y)
                {
                    mText.fontSize -= 1;
                }
                break;
        }
    }
}

第二种，直接设置text上的BestFit属性为true即可

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