IOS: How to upload a file to specific Google drive folder using Google drive sdk library

Question

I integrated Google drive sdk with my iOS app. But I do not know how to upload a file to Google drive specific folder.

Here the code am using to upload the file. But this one uploading the file to my google drive root folder. Any one share a code to upload a file to google drive specific folder?.

My Code:

-(void)uploadFileToGoogleDrive:(NSString*)fileName
{    
GTLDriveFile *driveFile = [[[GTLDriveFile alloc]init] autorelease];

driveFile.mimeType = @"application/pdf";
driveFile.originalFilename = @"test.doc";
driveFile.title = @"test.doc";

NSString *filePath = [LocalFilesDetails getUserDocumentFullPathForFileName:fileName isSignedDocument:YES];

GTLUploadParameters *uploadParameters = [GTLUploadParameters
                                         uploadParametersWithData:[NSData dataWithContentsOfFile:filePath]
                                         MIMEType:@"application/pdf"];    

GTLQueryDrive *query = [GTLQueryDrive queryForFilesInsertWithObject:driveFile
                                    uploadParameters:uploadParameters];

[self.driveService executeQuery:query 
  completionHandler:^(GTLServiceTicket *ticket,
                       GTLDriveFile *updatedFile,
                       NSError *error) {
    if (error == nil) {
        NSLog(@"\n\nfile uploaded into google drive\\<my_folder> foler");
    } else {
        NSLog(@"\n\nfile uplod failed google drive\\<my_folder> foler");            
    }
}];
}

Answer 1

You need to set the parents property of your driveFile reference.

GTLDriveParentReference *parentRef = [GTLDriveParentReference object];
parentRef.identifier = folderIdentifier; // identifier property of the folder
driveFile.parents = @[ parentRef ];

Answer 2

I don't know iOS, so may be off base, but does this code from https://developers.google.com/drive/v2/reference/files/insert help

+ (void)insertFileWithService:(GTLServiceDrive *)service
                        title:(NSString *)title
                  description:(NSString *)description
                     parentId:(NSString *)parentId
                     mimeType:(NSString *)mimeType
                         data:(NSData *)data
              completionBlock:(void (^)(GTLDriveFile *, NSError *))completionBlock {
  GTLDriveFile *file = [GTLDriveFile object];

  file.title = title;
  file.descriptionProperty = description;
  file.mimeType = mimeType;

  GTLUploadParameters *uploadParameters =
    [GTLUploadParameters uploadParametersWithData:data MIMEType:mimeType];
  GTLQueryDrive *query =
    [GTLQueryDrive queryForFilesInsertWithObject:file
                                uploadParameters:uploadParameters];