Problems with the first and last sentences of UGUI Text Chinese symbolic sentences

 In game development, we often encounter the problem of abnormal display of Chinese symbols at the beginning or end of a sentence, but TextMeshPro does not have these problems because TMP supports configuration, so for the case where TMP cannot be used in the project, UGUI’s Text is used situation, what should I do?

For example, in the picture below: the double quotation mark is placed alone at the end of the sentence, which is particularly unsightly, and the version office requires revision.

 

After solving:

There is also this kind, the period is at the beginning of the sentence, which is also very strange.

 Baidu and Google did not find a suitable solution, or the solution found was flawed, so a class was specially written to solve this situation. It supports the configuration of symbols to avoid appearing at the end of the line, symbols to avoid appearing at the beginning of the line, etc. You can directly take to use.

code show as below:

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

/// <summary>
/// 该类解决中文符号在句首或句尾的问题，符号在句尾会自动换行
/// </summary>
public class TextBreaking : MonoBehaviour
{
    public Text textToReformat;
    [Multiline]
    public string debugString;

    [Header("Debug")] 
    private readonly List<string> avoidLineEndingList = new List<string>() {"“"};//避免在行尾的符号
    private readonly List<string> avoidLineHeadList = new List<string>() {"，", "！", "。"};//避免在行首的符号
    private readonly List<string> lineEndingList = new List<string>() {"\r\n", "\n", "\r"};//换行符列表
    [Multiline]
    private List<string> lineTextList = new List<string>();
    private string lineText;
    private int lineStartIndex;

    void Start()
    {
        Format();
    }

    [ContextMenu("Format")]
    void Format()
    {
        if (!string.IsNullOrEmpty(debugString))
        {
            textToReformat.text = debugString;
        }
        
        var generator = new TextGenerator();
        
        var settings = CopyFrom(textToReformat.GetGenerationSettings(textToReformat.rectTransform.rect.size));

        float boundWidth = textToReformat.rectTransform.sizeDelta.x;
        
        lineTextList.Clear();
        
        var value = textToReformat.text;
        //将\r\n替换为效果一样的\n，方便计算
        value = value.Replace("\r\n", "\n");
        
        var updatedText = "";
        int length = 0;
        lineText = "";
        lineStartIndex = 0;
        int lineLength = 0;
        while (length < value.Length)
        {
            length++;
            updatedText = value.Substring(0, length);
            //Debug.Log(updatedText + "==" + length); 
            
            lineLength++;
            if (lineStartIndex + lineLength > value.Length)
            {
                break;
            }
            lineText = value.Substring(lineStartIndex, lineLength); 

            float w = generator.GetPreferredWidth(lineText, settings) / settings.scaleFactor;
            
            var endValue = lineText.Substring(lineText.Length - 1, 1);
            //检测\r\n 这个上面将\r\n过滤掉了，可能不需要这样判断了
            var endValue2 = lineText.Length > 2 ? lineText.Substring(lineText.Length - 2, 2) : "";
            bool isLineEnding = lineEndingList.Contains(endValue2);
            if (!isLineEnding)
            {
                isLineEnding = lineEndingList.Contains(endValue);
            }

            if (isLineEnding)
            {
                length += 1;//判断是回车，长度需要增加1
                lineLength = 1;
                //lineText = value.Substring(lineStartIndex, 1);
                lineStartIndex = updatedText.Length;
                lineTextList.Add(lineText);
                continue;
            }
            if (w >= boundWidth)
            {
//                var endValue = lineText.Substring(lineText.Length - 1, 1);
                var endValue3=lineText.Length > 2 ? lineText.Substring(lineText.Length - 2, 1) : "";

                //判断句尾
                if (avoidLineEndingList.Contains(endValue3))
                {
                    int insertIndex = updatedText.Length - 2;
                    value = value.Insert(insertIndex, "\n");
                    lineText = value.Substring(lineStartIndex, insertIndex-lineStartIndex);
                    length -= 1;//插入后长度索引减掉
                    lineLength = 0;
                    lineStartIndex = insertIndex + 1;
                }
                //判断句首
                else if (avoidLineHeadList.Contains(endValue))
                {
                    int insertIndex = updatedText.Length - 2;
                    value = value.Insert(insertIndex, "\n");
                    lineText = value.Substring(lineStartIndex, insertIndex-lineStartIndex);
                    length -= 1;//插入后长度索引减掉
                    lineLength = 0;
                    lineStartIndex = insertIndex + 1;
                }
                else
                {
                    lineLength = 1;
                    lineText = value.Substring(lineStartIndex, lineText.Length - 1);
                    lineStartIndex = updatedText.Length-1;
                }
                lineTextList.Add(lineText);

                //Debug.Log("[AA]"+lineText + "==" + w + "===" + length);
            }
        }
 
        textToReformat.text = updatedText;
    }
    
    TextGenerationSettings CopyFrom(TextGenerationSettings o) {
        return new TextGenerationSettings {
            font = o.font,
            color = o.color,
            fontSize = o.fontSize,
            lineSpacing = o.lineSpacing,
            richText = o.richText,
            scaleFactor = o.scaleFactor,
            fontStyle = o.fontStyle,
            textAnchor = o.textAnchor,
            alignByGeometry = o.alignByGeometry,
            resizeTextForBestFit = o.resizeTextForBestFit,
            resizeTextMinSize = o.resizeTextMinSize,
            resizeTextMaxSize = o.resizeTextMaxSize,
            updateBounds = o.updateBounds,
            verticalOverflow = o.verticalOverflow,
            horizontalOverflow = o.horizontalOverflow,
            generationExtents = o.generationExtents,
            pivot = o.pivot,
            generateOutOfBounds = o.generateOutOfBounds
        };
    }
}

How to configure symbols, see the figure below

Realization principle

The principle of implementation is actually very violent. It is to traverse each line, test whether it is exceeded one by one, judge whether it is at the end or the beginning of the line, and manually add a newline to make the display normal.

https://github.com/cooloo/TextBreakinghttps://github.com/cooloo/TextBreaking