Asynchronous url requests inside dispatch_async

Question

I am trying to implement asynchronous url requests in a particular function, I want all these requests to complete and then do a particular action but the action precedes th

Answer 1

You can create a dispatch_group_t and then use dispatch_group_notify to execute the updateUIFunction when the previous block of the group finish running, for example:

dispatch_queue_t fetchQ = dispatch_queue_create("Featured Doc Downloader", NULL);
dispatch_async(fetchQ, ^{
    dispatch_group_t group = dispatch_group_create();
    dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{
        [self myAsyncMultipleURLRequestFunction];
    });
    dispatch_group_notify(group, dispatch_get_global_queue(0, 0), ^{
        dispatch_async(dispatch_get_main_queue(), ^{
            [self updateUIFunction];
        });
    });
});