AFNetworking image download without using AFImageRequestOperation - ios

Question

I want to download a image from url and get NSData in response object.
This is how I set up the operation:
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
AFHTTPResponseSerializer *responseSerializer = [AFHTTPResponseSerializer serializer];
responseSerializer.acceptableContentTypes = [NSSet setWithObject:#"image/jpeg"];
manager.responseSerializer = responseSerializer;
AFHTTPRequestSerializer *requestSerializer = [AFHTTPRequestSerializer serializer];
[requestSerializer setValue:#"image/jpeg" forHTTPHeaderField:#"Accept"];
[requestSerializer setValue:#"image/jpeg" forHTTPHeaderField:#"Content-Type"];
manager.requestSerializer = requestSerializer;
[manager GET:url parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSData *data = responseObject;
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
}];
Response object is always nil, url is correct, when openned in browser it shows up the image, the operation descriptions shows content-length and content type(image/jpeg), but response object doesn't seem to pick it up.
Thank you
Answer: instead of responseObject, operation.reponseData need to be used.

Answer 1

You will need to tell AFNetworking that you expect image data and that to should be deserialized as that.
manager.responseSerializer = [AFImageResponseSerializer serializer];
AFImageResponseSerializer Class Reference
By default, AFImageSerializer accepts the following MIME types, which
correspond to the image formats supported by UIImage or NSImage:
image/tiff
image/jpeg
image/gif
image/png
image/ico
image/x-icon
image/bmp
image/x-bmp
image/x-xbitmap
image/x-win-bitmap
Answer: instead of responseObject, operation.reponseData need to be used.
if you would user proper serialization, it would be responseObject, transformed into a object you can immediately use. operation.reponseData contains the raw data sent from the server. usually it is not what you need.