如何在iOS的ftp服务器上上传.png或.jpg图像?

我想从我的iOS应用程序将图像上传或保存到FTP服务器.但是每次我收到 ftp未连接

I want to upload or save image to FTP server from my iOS app. but every time I get error that ftp not connected

我使用SCRFTPRequest库.

I use SCRFTPRequest library.

这是我的代码...

UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
NSData * imageData = UIImagePNGRepresentation(image);
NSFileManager * fileManager = [NSFileManager defaultManager];
NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString * documentsDirectory = [paths objectAtIndex:0];
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png",image]];
[fileManager createFileAtPath:fullPath contents:imageData attributes:nil];
NSLog(@"image saved");
[picker dismissViewControllerAnimated:YES completion:nil];

ftpRequest = [SCRFTPRequest requestWithURL:[NSURL URLWithString:@"ftp://myURL"] toUploadFile:fullPath];
ftpRequest.username = @"DemoUser";
ftpRequest.password = @"DemoUser";
ftpRequest.customUploadFileName = @"inapp";
ftpRequest.delegate = self;
[ftpRequest startAsynchronous];