How to check the NSDATA type?

问题

I have the class which downloads images

First I have NSMutable URLRequest than I establish NSURLConnection and than I want to check which data I received in this function

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

If it is image than write to the folder when it is some text than skip to the next image.

How do I check the type of received data?

回答1:

In delegate method of NSURLConnection, you can get header of response, from which you can get content type. If content type is set correctly from server, you will get content type in response over here correctly.

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
       NSDictionary *dicFields = [response allHeaderFields];
}

来源：https://stackoverflow.com/questions/6507070/how-to-check-the-nsdata-type