SDWebImage如何设置header

SDWebImageDownloader *downloader = [SDWebImageDownloader sharedDownloader]; [downloadersetValue:@"xxxxx" forHTTPHeaderField:@"xxxxx"];        

WeakSelf(weakSelf);

[downloaderdownloadImageWithURL:[NSURLURLWithString:dic[EV07B_KEY34_PHOTO_URL]]options:0progress:nilcompleted:^(UIImage*_Nullableimage,NSData*_Nullabledata,NSError*_Nullableerror,BOOLfinished) {                            If(image && finished){

                weakSelf.iconView.image= image;

            }

        }];