After some research, I used AFHttpClient enqueueBatchOfHTTPRequestOperations
to accomplish multiple file downloads.
Here is how it goes:
//Consider I get destFilesArray filled with Dicts already with URLs and local paths
NSMutableArray * opArray = [NSMutableArray array];
AFHTTPClient *httpClient = nil;
for (id item in destFilesArray)
{
NSDictionary * fileDetailDict = (NSDictionary *)item;
NSString * url = [fileDetailDict objectForKey:@"fileURL"];
if (!httpClient)
httpClient = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:url]];
NSString * filePath = [photoDetailDict objectForKey:@"filePath"];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
operation.outputStream = [NSOutputStream outputStreamToFileAtPath:filePath append:NO];
[opArray addObject:operation];
}
[httpClient enqueueBatchOfHTTPRequestOperations:opArray progressBlock:nil completionBlock:^(NSArray *operations)
{
//gets called JUST ONCE when all operations complete with success or failure
for (AFJSONRequestOperation *operation in operations)
{
if (operation.response.statusCode != 200)
{
NSLog(@"operation: %@", operation.request.URL);
}
}
}];