unity使用iTextSharp生成PDF文件

iTextSharp 可以在VS中工具下面得NuGet包管理器中下载，具体操作可以搜一下很多，
我直接把我得生成pdf代码附上我这个是生成我一个csv文件内容和图片
csharp 复制代码
using System.IO;
using UnityEngine;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.Collections.Generic;
using UnityEngine.UI;
using System.Text;
using Font = iTextSharp.text.Font;
using Image = iTextSharp.text.Image;
using UnityEngine.Networking;
using System.Collections;
public class PDFGenerator : MonoBehaviour
{
    public string reportTitle = "Unity 报告";
    public Text printSuccessText;
    private BaseFont chineseBaseFont;

    // 在Awake或Start中预加载字体
    private IEnumerator Start()
    {
        yield return StartCoroutine(LoadChineseFont());
    }

    private IEnumerator LoadChineseFont()
    {
        // 关键：注册编码提供程序
        Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

        // 1. 优先尝试使用内置字体
        try
        {
            chineseBaseFont = BaseFont.CreateFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);
            Debug.Log("成功加载内置字体 STSong-Light");
            yield break;
        }
        catch (System.Exception e)
        {
            Debug.LogWarning($"内置字体加载失败: {e.Message}");
        }

        // 2. 尝试从StreamingAssets加载字体
        string fontPath = Path.Combine(Application.streamingAssetsPath, "SIMFANG.TTF");
        Debug.Log("尝试加载字体路径: " + fontPath);

        // 处理不同平台的路径
#if UNITY_STANDALONE_WIN || UNITY_EDITOR
        // Windows平台特殊处理
        if (File.Exists(fontPath))
        {
            try
            {
                // 添加额外的编码参数
                chineseBaseFont = BaseFont.CreateFont(fontPath,
                    BaseFont.IDENTITY_H,
                    BaseFont.EMBEDDED,
                    true, // 强制缓存
                    null, // 字体数据
                    null, // 字体度量
                    true, // 强制读取
                    true); // 缓存到文件
                Debug.Log("成功从文件系统加载字体: " + fontPath);
                yield break;
            }
            catch (System.Exception e)
            {
                Debug.LogError($"Windows平台字体加载失败: {e.Message}\n{e.StackTrace}");
            }
        }
        else
        {
            Debug.LogWarning($"字体文件不存在: {fontPath}");
        }
#elif UNITY_ANDROID && !UNITY_EDITOR
    // Android平台特殊处理
    string url = "jar:file://" + Application.dataPath + "!/assets/SIMFANG.TTF";
    using (UnityWebRequest www = UnityWebRequest.Get(url))
    {
        yield return www.SendWebRequest();
        
        if (www.result == UnityWebRequest.Result.Success)
        {
            byte[] fontData = www.downloadHandler.data;
            try
            {
                chineseBaseFont = BaseFont.CreateFont(
                    "SIMFANG.TTF", 
                    BaseFont.IDENTITY_H, 
                    BaseFont.EMBEDDED, 
                    false, 
                    fontData, 
                    null);
                Debug.Log("成功从Android资源加载字体");
                yield break;
            }
            catch (System.Exception e)
            {
                Debug.LogError($"Android字体加载失败: {e.Message}\n{e.StackTrace}");
            }
        }
        else
        {
            Debug.LogError($"无法加载Android字体文件: {www.error}");
        }
    }
#elif UNITY_IOS && !UNITY_EDITOR
    // iOS平台特殊处理
    if (File.Exists(fontPath))
    {
        try
        {
            chineseBaseFont = BaseFont.CreateFont(fontPath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
            Debug.Log("成功从iOS资源加载字体");
            yield break;
        }
        catch (System.Exception e)
        {
            Debug.LogError($"iOS字体加载失败: {e.Message}\n{e.StackTrace}");
        }
    }
#endif

        // 3. 最后尝试使用系统字体
        try
        {
            chineseBaseFont = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.EMBEDDED);
            Debug.LogWarning("使用默认系统字体（可能不支持中文）");
        }
        catch (System.Exception e)
        {
            Debug.LogError($"系统字体加载失败: {e.Message}");
            chineseBaseFont = null;
        }
    }

    public void GeneratePDF(string pdfName, string csvFilePath, string imageFolderPath, string outputFolderPath)
    {
        if (chineseBaseFont == null)
        {
            Debug.LogError("字体未加载完成，无法生成PDF");
            return;
        }

        Document document = new Document();

        if (!Directory.Exists(outputFolderPath))
        {
            Directory.CreateDirectory(outputFolderPath);
        }

        string pdfPath = Path.Combine(outputFolderPath, pdfName + ".pdf");
        try
        {
            PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(pdfPath, FileMode.Create));
            document.Open();

            // 使用预加载的字体
            iTextSharp.text.Font chineseFont = new iTextSharp.text.Font(chineseBaseFont, 12);

            // 添加标题
            document.Add(new Paragraph(reportTitle, chineseFont) { Alignment = Element.ALIGN_CENTER });
            document.Add(new Paragraph(" ", chineseFont));

            // 添加表格内容
            PdfPTable table = CreatePdfTable(csvFilePath, chineseFont);
            document.Add(table);
            document.Add(new Paragraph(" ", chineseFont));

            // 添加图片
            AddImagesToPdf(document, imageFolderPath);

            document.Close();

            if (printSuccessText != null)
            {
                printSuccessText.text = $"PDF生成成功: {pdfPath}";
                printSuccessText.gameObject.SetActive(true);
            }
        }
        catch (System.Exception e)
        {
            Debug.LogError($"PDF生成失败: {e.Message}\n{e.StackTrace}");
            if (printSuccessText != null)
            {
                printSuccessText.text = $"PDF生成失败: {e.Message}";
                printSuccessText.gameObject.SetActive(true);
            }
        }
    }

    private PdfPTable CreatePdfTable(string csvFilePath, Font font)
    {
        List<string[]> csvData = ReadCSVFile(csvFilePath);
        if (csvData.Count == 0) return new PdfPTable(1);

        PdfPTable table = new PdfPTable(csvData[0].Length);
        table.WidthPercentage = 100;

        foreach (var row in csvData)
        {
            foreach (string cellValue in row)
            {
                table.AddCell(new PdfPCell(new Phrase(cellValue, font)));
            }
        }
        return table;
    }

    private void AddImagesToPdf(Document document, string imageFolderPath)
    {
        if (!Directory.Exists(imageFolderPath)) return;

        foreach (string imageFile in Directory.GetFiles(imageFolderPath, "*.png"))
        {
            try
            {
                Image image = Image.GetInstance(imageFile);
                image.ScaleToFit(document.PageSize.Width - 40, document.PageSize.Height - 40);
                image.Alignment = Element.ALIGN_CENTER;
                document.Add(image);
                document.Add(new Paragraph(" "));
            }
            catch (System.Exception e)
            {
                Debug.LogError($"添加图片 {imageFile} 到 PDF 失败: {e.Message}");
            }
        }
    }

    private List<string[]> ReadCSVFile(string filePath)
    {
        List<string[]> data = new List<string[]>();
        try
        {
            using (StreamReader reader = new StreamReader(filePath, Encoding.UTF8))
            {
                while (!reader.EndOfStream)
                    data.Add(reader.ReadLine().Split(','));
            }
        }
        catch (System.Exception e)
        {
            Debug.LogError($"读取CSV文件失败: {e.Message}");
        }
        return data;
    }
}
这个时候在编辑器运行是没错但是打包出来就会出问题PDF中不显示中文
还需要找到Unity编辑器的安装路径
例如：2019.4.34f1c1\Editor\Data\MonoBleedingEdge\lib\mono\unityjit找到以下dll
I18N.CJK.dll 、I18N.dll、I18N.MidEast.dll
I18N.Other.dll、I18N.Rare.dll、I18N.West.dll
这些文件我是放在了打包出来exe同级文件夹里面成功得，也有人是放在XXXX_Data\Managed
请大家自行测试