Creating block queues with completion - ios

Question

I want to create 2 async queues with completion blocks and after finished this blocks I want to run some action. I can not achieve it with this code. Where my bad?
dispatch_queue_t queue = dispatch_queue_create("com.company.queue", 0);
dispatch_group_t group = dispatch_group_create();
dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
// block 1
dispatch_group_async(group, queue, ^{
[[WebRequests sharedInstance] request:#{#"type" : [NSNumber numberWithInt:request_uploadAdv], #"adv" : adv} withCompletion:^(id response) {
BOOL success = [response boolValue];
NSLog(#"done1 text");
// block 1 Done
}];
});
// block 2 //картинки
dispatch_group_async(group, queue, ^{
[self getImagesForAdv:adv completion:^(NSArray *images) {
[[WebRequests sharedInstance] uploadPhotos:images completion:^(BOOL success) {
uploadImagesSuccess = YES;
NSLog(#"done1 2\n");
// block 2 Done
}];
}];
});
dispatch_group_notify(group, queue, ^{
printf("all tasks are finished!\n");
});

Answer 1

First, you're missing a }); in there somewhere. Second, there's no need for the outer dispatch_group_async call anyway. Assuming it's there because you want these things to execute with background priority, you can do this instead:
dispatch_queue_t queue = dispatch_queue_create("com.company.queue", 0);
dispatch_set_target_queue(queue, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0));
dispatch_group_t group = dispatch_group_create();
// block 1
dispatch_group_async(group, queue, ^{
[[WebRequests sharedInstance] request:#{#"type" : [NSNumber numberWithInt:request_uploadAdv], #"adv" : adv} withCompletion:^(id response) {
BOOL success = [response boolValue];
NSLog(#"done1 text");
// block 1 Done
}];
});
// block 2 //картинки
dispatch_group_async(group, queue, ^{
[self getImagesForAdv:adv completion:^(NSArray *images) {
[[WebRequests sharedInstance] uploadPhotos:images completion:^(BOOL success) {
uploadImagesSuccess = YES;
NSLog(#"done1 2\n");
// block 2 Done
}];
}];
});
dispatch_group_notify(group, queue, ^{
printf("all tasks are finished!\n");
});