angularjs – 使用$resource下载文件并显示加载屏幕的Angular js

我正在使用Angular js来显示加载屏幕.它适用于除REST服务之外的所有REST服务调用以下载文件.我理解为什么它不起作用,因为下载我没有使用$resource进行任何服务调用;而不是我使用常规方法下载文件因此Angular js代码对启动/完成服务请求没有任何控制.我尝试使用$resource命中这个REST服务但是我从这个服务获取数据,在这种情况下,加载屏幕工作正常,但不知道如何使用这些数据显示给用户以角度方式下载.以下是必需的细节.请帮忙.

方法1使用iframe方法：

/*Download file */
            scope.downloadFile = function (fileId) {
                //Show loading screen. (Somehow it is not working)
                scope.loadingProjectFiles=true;
                var fileDownloadURL = "/api/files/" + fileId + "/download";
                downloadURL(fileDownloadURL);
              //Hide loading screen
                scope.loadingProjectFiles=false;
            };

            var $idown;  // Keep it outside of the function,so it's initialized once.
            var downloadURL = function (url) {
                if ($idown) {
                    $idown.attr('src',url);
                } else {
                    $idown = $('<iframe>',{ id: 'idown',src: url }).hide().appendTo('body');
                }
            };

方法2使用$resource(不确定如何在屏幕上显示数据下载)

/*Download file */
            scope.downloadFile = function (fileId) {
                //Show loading screen (Here loading screen works).  
                scope.loadingProjectFiles=true;                 
                  //File download object
                    var fileDownloadObj = new DownloadFile();
                 //Make server call to create new File
                    fileDownloadObj.$get({ fileid: fileid },function (response) {
                        //Q? How to use the response data to display on UI as download popup
                        //Hide loading screen
                        scope.loadingProjectFiles=false;
                    });

            };

scope.downloadFile = function (fileId) {
    //Show loading screen (Here loading screen works).  
    scope.loadingProjectFiles=true;                 
    var FileResource = $resource('/api/files/:idParam',{idParam:'@id'});
    //Make server call to retrieve a file
    var yourFile = FileResource.$get({ id: fileId },function () {
        //Now (inside this callback) the response data is loaded inside the yourFile variable
        //I know it's an ugly pattern but that's what $resource is about...
        DoSomethingWithYourFile(yourFile);
        //Hide loading screen
        scope.loadingProjectFiles=false;
    });
 };