(五) uni 实现文件预览（解决 IOS端 文件名乱码问题）_uni.opendocument

先贴代码

tapDown(fileId) {
		const userInfo = this.$apiCache.getUserInfo();
		uni.downloadFile({
			url: 'http://192.168.100.4:31173/My_OAModule/ResourceFile/downFile?loginMark=' + userInfo.loginMark + '&token=' + userInfo.token + '&data=' + fileId,
			success: function(res) {
					//安卓端 没有问题
					//苹果端 因为下载文件 后台会返回中文下载文件名 IOS 需要 url解码 
					const filePath = res.tempFilePath; //临时文件路径
					//const decodePath = decodeURIComponent(filePath); //解码后路径
					//plus.runtime.openFile(filePath);
					uni.openDocument({
						filePath: filePath,
						success: function(res) {
							console.log('打开文档成功');
						}
					});
			},
			fail: function(err) {
				//console.log(err);
			}
		});
}

前台代码就是这样，主要解决方案 放在后台 设置请求头

         /// <summary>
        /// 普通下载
        /// </summary>
        /// <param name="FileName">文件虚拟路径</param>
        ///  /// <param name="name">返回客户端名称</param>
        public static void DownLoadold(string FileName, string name)
        {
            string destFileName = FileName;
            if (File.Exists(destFileName))
            {
                FileInfo fi = new FileInfo(destFileName);
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.ClearHeaders();
                HttpContext.Current.Response.Buffer = false;
 
                //这段代码在IOS 浏览器下载时候 会出现 文件名乱码
                //HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(name, System.Text.Encoding.UTF8));
                
                //主要代码这里设置头信息
                StringBuilder headerValue = new StringBuilder();
                headerValue.Append("attachment;");
                headerValue.Append(" filename=\"" + encodeURIComponent(name) + "\";");
                headerValue.Append(" filename*=utf-8''" + encodeURIComponent(name));
 
                HttpContext.Current.Response.AppendHeader("Content-Disposition", headerValue.ToString());
                HttpContext.Current.Response.AppendHeader("Content-Length", fi.Length.ToString());
                HttpContext.Current.Response.ContentType = "application/octet-stream";
                HttpContext.Current.Response.WriteFile(destFileName);
                HttpContext.Current.Response.Flush();
                HttpContext.Current.Response.End();
            }
        }
 
 
         /// <summary>
        ///  符合 RFC 3986 标准的“百分号URL编码”在这个方法里，空格会被编码成%20，而不是+和浏览器的encodeURIComponent行为一致
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        private static string encodeURIComponent(string value)
        {
            try
            {
                return HttpUtility.UrlEncode(value, Encoding.UTF8).Replace("\\+", "%20");
            }
            catch (Exception ex)
            {
                HttpContext.Current.Response.Write("Error:" + ex.Message);
                return null;
            }
        }

搞了一下午 总结下

大致原因就是 苹果设备自带浏览器 与 windows上面的浏览器的解析编码不一致，你也可以在苹果端下载个360 或者其他浏览器试试