Unity3D 加载PDF文件以及简单的切换页面

Posted 2022-01-24 菜菜ANY

先导入插件 PDFRenderer

链接: https://pan.baidu.com/s/1Un-FoINPmK8iVBRLS0jkTw 提取码: z78q 

然后使用以下代码就可以

using Paroxe.PdfRenderer;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;

public class PlayPDF : MonoBehaviour

    public RawImage rawImage;   //显示PDF的UI
    PDFDocument pdfDocument;    //PDF文件
    PDFRenderer pdfRenderer;    //PDF渲染
    int curPDFPage;    //当前显示的PDF页数
    int countOfPDFAllPage;    //PDF文件总页数
    //PDF网络路径 （这里填入自己的网络PDF路径）
    string url= "https:// xx.xxxx.xxxx.pdf";
    // Start is called before the first frame update
    void Start()
    
        StartCoroutine(DownLoadFile(url));
    

    /// <summary>
    /// 加载本地PDF文件
    /// </summary>
    /// <param name="url"></param>
    void LoadLocalPDF(string url)
    
        pdfDocument = new PDFDocument(url);
        if (pdfDocument.IsValid)    //判断该文档是否有效
        
            curPDFPage = 0;
            countOfPDFAllPage = pdfDocument.GetPageCount();
            ScreenShowPDF(GetCurPagePDFTexture(curPDFPage));

        
        else
        
            if (File.Exists(url))
            
                File.Delete(url);
            
            pdfDocument = null;
        
    

    /// <summary>
    /// 获取当前页面的PDF画面
    /// </summary>
    /// <param name="page"></param>
    /// <returns></returns>
    Texture2D GetCurPagePDFTexture(int page)
    
        if (pdfDocument == null) return null;
        Texture2D tex = pdfDocument.Renderer.RenderPageToTexture(pdfDocument.GetPage(page));
        //纹理的过滤模式
        tex.filterMode = FilterMode.Bilinear;
        //随着值变大，纹理在浅角度下会更清晰。值越低，表示纹理在浅角度下更模糊。‎
        tex.anisoLevel = 8;

        return tex;
    

    /// <summary>
    /// 下载网络PDF文件到本地
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    IEnumerator DownLoadFile(string url)
    
        yield return new WaitForSeconds(0.5f);
        string directoryPath = Application.persistentDataPath + "/FileCache";
        if (!Directory.Exists(directoryPath))
        
            Directory.CreateDirectory(directoryPath);
        
        string downloadFileName = url.Substring(url.LastIndexOf('/') + 1);
        string localpath = directoryPath + "/" + downloadFileName;
        Debug.Log(downloadFileName);
        //MDebug(localpath);
        //如果本地文件已存在 直接加载
        if (File.Exists(localpath))
        
            LoadLocalPDF(localpath);
            yield break;
        

        //UnityWebRequest webRequest = new UnityWebRequest();
        UnityWebRequest webRequest = UnityWebRequest.Get(url);
        webRequest.timeout = 60;
        yield return webRequest.SendWebRequest();
        if (webRequest.isNetworkError)
        
            Debug.Log("Download Error: " + webRequest.error);
            if (File.Exists(localpath))
            
                File.Delete(localpath);
            
        
        else
        
            var file = webRequest.downloadHandler.data;
            FileStream nFile = new FileStream(localpath, FileMode.Create);
            nFile.Write(file, 0, file.Length);
            nFile.Close();
            LoadLocalPDF(localpath);
        
    
    /// <summary>
    /// 切换PDF页面
    /// </summary>
    void ChangePDFPage()
    
        Texture2D tex= GetCurPagePDFTexture(curPDFPage);
        ScreenShowPDF(tex);
    

    /// <summary>
    /// 显示PDF在UI或者物体上
    /// </summary>
    /// <param name="texture"></param>
    private void ScreenShowPDF(Texture2D texture)
    
        if (texture == null) return;
        if (texture.width >= 2048 || texture.height >= 2048)
            return;

        RectTransform recttrans = rawImage.GetComponent<RectTransform>();
        //3DUI PDF rawimage 大小
        float maxWidth = 1920;
        float maxHeight = 1080;
        float scalex = texture.width * 1.0f / maxWidth;
        float scaley = texture.height * 1.0f / maxHeight;
        if (scalex > scaley)
        
            float d = 1.0f / scalex;
            scaley = scaley * d;
            scalex = 1.0f;
        
        else
        
            float d = 1.0f / scaley;
            scalex = scalex * d;
            scaley = 1.0f;
        
        recttrans.sizeDelta = new Vector2(maxWidth * scalex, maxHeight * scaley);
        rawImage.GetComponent<RawImage>().texture = texture;
        rawImage.GetComponent<RawImage>().color = new Color(1.0f, 1.0f, 1.0f, 1.0f);
    

    // Update is called once per frame
    void Update()
    
        //翻页 翻页时关闭自动播放
        if (Input.GetKeyDown(KeyCode.RightArrow))
        

            StopAllCoroutines();
            curPDFPage += 1;
            if (curPDFPage >= countOfPDFAllPage) curPDFPage = 0;
            ChangePDFPage();
        
        if (Input.GetKeyDown(KeyCode.LeftArrow))
        
            StopAllCoroutines();
            curPDFPage -= 1;
            if (curPDFPage < 0) curPDFPage = countOfPDFAllPage-1;
            ChangePDFPage();
        
           
            //自动播放
            if (Input.GetKeyDown(KeyCode.A))
            
                StartCoroutine(AutoTurnPage());
            
         //停止自动播放
            if (Input.GetKeyDown(KeyCode.S))
            
                StopAllCoroutines();
            
    

添加自动翻页功能

bool IsAutoPlayLoop = false;    //循环播放
        bool autoTurnPageOver = false;  //自动播放结束
        /// <summary>
        /// 自动翻页
        /// </summary>
        /// <returns></returns>
        IEnumerator AutoTurnPage()
        
            yield return new WaitForSeconds(2);
            curPDFPage += 1;
            if (curPDFPage < countOfPDFAllPage)
            
                autoTurnPageOver = false;
                ChangePDFPage();
                StartCoroutine(AutoTurnPage());
            
            else
            
                
                if (IsAutoPlayLoop)  //循环自动播放
                
                    curPDFPage = 0;
                    ChangePDFPage();
                    StartCoroutine(AutoTurnPage());
                
                else//非循环自动播放
                
                    if (autoTurnPageOver)
                    
                        curPDFPage = 0;
                        ChangePDFPage();
                        StartCoroutine(AutoTurnPage());
                    
                
                autoTurnPageOver = true;