Unity3D 加載PDF檔案以及簡單的切換頁面

先匯入插件 PDFRenderer

鏈接: https://pan.baidu.com/s/1Un-FoINPmK8iVBRLS0jkTw 提取碼: z78q

然后使用以下代碼就可以

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;   //顯示PDF的UI
    PDFDocument pdfDocument;    //PDF檔案
    PDFRenderer pdfRenderer;    //PDF渲染
    int curPDFPage;    //當前顯示的PDF頁數
    int countOfPDFAllPage;    //PDF檔案總頁數
    //PDF網路路徑 （這里填入自己的網路PDF路徑）
    string url= "https:// xx.xxxx.xxxx.pdf";
    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine(DownLoadFile(url));
    }

    /// <summary>
    /// 加載本地PDF檔案
    /// </summary>
    /// <param name="url"></param>
    void LoadLocalPDF(string url)
    {
        pdfDocument = new PDFDocument(url);
        if (pdfDocument.IsValid)    //判斷該檔案是否有效
        {
            curPDFPage = 0;
            countOfPDFAllPage = pdfDocument.GetPageCount();
            ScreenShowPDF(GetCurPagePDFTexture(curPDFPage));

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

    /// <summary>
    /// 獲取當前頁面的PDF畫面
    /// </summary>
    /// <param name="page"></param>
    /// <returns></returns>
    Texture2D GetCurPagePDFTexture(int page)
    {
        if (pdfDocument == null) return null;
        Texture2D tex = pdfDocument.Renderer.RenderPageToTexture(pdfDocument.GetPage(page));
        //紋理的過濾模式
        tex.filterMode = FilterMode.Bilinear;
        //隨著值變大，紋理在淺角度下會更清晰，值越低，表示紋理在淺角度下更模糊，?
        tex.anisoLevel = 8;

        return tex;
    }

    /// <summary>
    /// 下載網路PDF檔案到本地
    /// </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);
        //如果本地檔案已存在 直接加載
        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>
    /// 切換PDF頁面
    /// </summary>
    void ChangePDFPage()
    {
        Texture2D tex= GetCurPagePDFTexture(curPDFPage);
        ScreenShowPDF(tex);
    }

    /// <summary>
    /// 顯示PDF在UI或者物體上
    /// </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()
    {
        //翻頁 翻頁時關閉自動播放
        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();
        }
           
            //自動播放
            if (Input.GetKeyDown(KeyCode.A))
            {
                StartCoroutine(AutoTurnPage());
            }
         //停止自動播放
            if (Input.GetKeyDown(KeyCode.S))
            {
                StopAllCoroutines();
            }
    }
}

添加自動翻頁功能

bool IsAutoPlayLoop = false;    //回圈播放
        bool autoTurnPageOver = false;  //自動播放結束
        /// <summary>
        /// 自動翻頁
        /// </summary>
        /// <returns></returns>
        IEnumerator AutoTurnPage()
        {
            yield return new WaitForSeconds(2);
            curPDFPage += 1;
            if (curPDFPage < countOfPDFAllPage)
            {
                autoTurnPageOver = false;
                ChangePDFPage();
                StartCoroutine(AutoTurnPage());
            }
            else
            {
                
                if (IsAutoPlayLoop)  //回圈自動播放
                {
                    curPDFPage = 0;
                    ChangePDFPage();
                    StartCoroutine(AutoTurnPage());
                }
                else//非回圈自動播放
                {
                    if (autoTurnPageOver)
                    {
                        curPDFPage = 0;
                        ChangePDFPage();
                        StartCoroutine(AutoTurnPage());
                    }
                }
                autoTurnPageOver = true;
            }
            
        }