Unity UGUI Text Text box adaptation

One 、 The size of the text box is fixed , Text adaptation

1、 Check the of the text box Best Fit, It is found that the effect is not particularly ideal , When there is more text, you should wrap first , The font will not shrink until it is full , If there are spaces in the text , It seems that it can

2、 Customize text

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

/// <summary>
/// Text
///  Auto shrink 
///  Check Best Fit after , The font size will be reduced only after exceeding the text box 
/// </summary>
public class ShrinkText : Text
{
    /// <summary>
    ///  Number of currently visible text lines 
    /// </summary>
    public int VisibleLines { get; private set; }

    private void _UseFitSettings()
    {
        TextGenerationSettings settings = GetGenerationSettings(rectTransform.rect.size);
        settings.resizeTextForBestFit = false;

        if (!resizeTextForBestFit)
        {
            cachedTextGenerator.PopulateWithErrors(text, settings, gameObject);
            return;
        }

        int minSize = resizeTextMinSize;
        int txtLen = text.Length;
        for (int i = resizeTextMaxSize; i >= minSize; --i)
        {
            settings.fontSize = i;
            cachedTextGenerator.PopulateWithErrors(text, settings, gameObject);
            if (cachedTextGenerator.characterCountVisible == txtLen) break;
        }
    }

    private readonly UIVertex[] _tmpVerts = new UIVertex[4];
    protected override void OnPopulateMesh(VertexHelper toFill)
    {
        if (null == font) return;

        m_DisableFontTextureRebuiltCallback = true;
        _UseFitSettings();

        // Apply the offset to the vertices
        IList<UIVertex> verts = cachedTextGenerator.verts;
        float unitsPerPixel = 1 / pixelsPerUnit;
        int vertCount = verts.Count;

        // We have no verts to process just return (case 1037923)
        if (vertCount <= 0)
        {
            toFill.Clear();
            return;
        }

        Vector2 roundingOffset = new Vector2(verts[0].position.x, verts[0].position.y) * unitsPerPixel;
        roundingOffset = PixelAdjustPoint(roundingOffset) - roundingOffset;
        toFill.Clear();
        if (roundingOffset != Vector2.zero)
        {
            for (int i = 0; i < vertCount; ++i)
            {
                int tempVertsIndex = i & 3;
                _tmpVerts[tempVertsIndex] = verts[i];
                _tmpVerts[tempVertsIndex].position *= unitsPerPixel;
                _tmpVerts[tempVertsIndex].position.x += roundingOffset.x;
                _tmpVerts[tempVertsIndex].position.y += roundingOffset.y;
                if (tempVertsIndex == 3)
                    toFill.AddUIVertexQuad(_tmpVerts);
            }
        }
        else
        {
            for (int i = 0; i < vertCount; ++i)
            {
                int tempVertsIndex = i & 3;
                _tmpVerts[tempVertsIndex] = verts[i];
                _tmpVerts[tempVertsIndex].position *= unitsPerPixel;
                if (tempVertsIndex == 3)
                    toFill.AddUIVertexQuad(_tmpVerts);
            }
        }

        m_DisableFontTextureRebuiltCallback = false;
        VisibleLines = cachedTextGenerator.lineCount;
    }
}

Two 、 The size of the text box changes with the text content

1、 add to Content Size Fitter Components , Choose horizontal variable or vertical variable according to your needs , The corresponding Fit Change it to Perferred Size

3、 ... and 、 The size of the text box with background changes with the text content

1、 stay Text Add Content Size Fitter and Vertical Layout Group Components

2、Text Can't check Best Fit

3、 Adjust the parent object Content Size Fitter and Vertical Layout Group Components to achieve the desired effect

Reference resources

[Unity] UGUI expand - Better text scaling ShrinkText - Simple books (jianshu.com)

(2 Bar message ) Unity -UGUI in Text Automatic adjustment of text box , Adaptive adjustment of font size _ Guoyun's blog -CSDN Blog _ugui Text adaptation