ngFileUpload在safari上发布空文件

我使用ngFileUpload发送图像到云服务，我的应用程序是建立在ionic上，并打算在ios和android上运行，我有以下代码来上传图像:

.service('photoUploadService', ['$q','Upload', '$ionicLoading', 'AppModel',
	function($q, $upload, $ionicLoading, AppModel){
    // creating a return object with a data property, matching the structure we return from the router resolve
    var ref = this;
    ref.dataURItoBlob = function(dataURI) {
		var contentType = 'image/png';
	  	var sliceSize = 512;
	  	var byteCharacters = atob(dataURI.split(',')[1]);
		  var byteArrays = [];
		  for (var offset = 0; offset < byteCharacters.length; offset += sliceSize) {
		    var slice = byteCharacters.slice(offset, offset + sliceSize);
		    var byteNumbers = new Array(slice.length);
		    for (var i = 0; i < slice.length; i++) {
		      byteNumbers[i] = slice.charCodeAt(i);
		    }
		    var byteArray = new Uint8Array(byteNumbers);
		    byteArrays.push(byteArray);
		  }
		    
		  var blob = new Blob(byteArrays, {type: contentType});
		  return blob;
	};
    ref.uploadPhoto = function(imageData, waitMessage, sucessCallback, sucessCBParameters){
    	var deferred = $q.defer();
    	var filename = Math.floor(Math.random()*90000) + 10000 + ".png";
		//var imageBase64 = finalAd.ad.image.split(',')[1];
		var blob = ref.dataURItoBlob(imageData);//new Blob([imageBase64], {type: 'image/png'});
		var file = new File([blob], filename, {type: 'image/png'});
		
		file.upload = $upload.upload({
			url: "https://api.cloudinary.com/v1_1/xxxxx/upload",
			data: {
				upload_preset: "xxxxx",
				tags: 'myphotoalbum',
				context: 'photo=' + filename,
				file: file
			}
		}).progress(function (e) {
			file.progress = Math.round((e.loaded * 100.0) / e.total);
			file.status = "Uploading... " + file.progress + "%";
			$ionicLoading.show({template: waitMessage + (file.progress) + "%"});
		}).success(function (data, status, headers, config) {
            sucessCBParameters.data = data;
            sucessCallback(sucessCBParameters);
            deferred.resolve(AppModel.ad.ad);
            
        }).error(function (data, status, headers, config) {
        	file.result = data;
        	console.error('PENDING ERROR HANDLER');
        	deferred.reject(data);
        });
        return deferred.promise;
    };
}]);

当我在android下运行我的代码时，它可以完美地工作，并且图像上传到服务器，但在IOs上运行时，我从cloudary得到一个"空文件"错误。调试代码，文件似乎是正确创建的，我得到的唯一错误是"空文件"。

到目前为止，我还不能确定实际的问题是，如果它与ngFileUpload或我创建图像字段的方式。

到目前为止，我已经尝试了这篇文章中描述的步骤，在angularjs中将base64数据url转换为图像文件，在angularjs和http://ourcodeworld.com/articles/read/150/how-to-create-an-image-file-from-a-base64-string-on-the-device-with-cordova中转换base64数据图像文件，没有运气。