How can I wait for delegate to complete before returning completion handler in method?

Question

I have a method which performs an action.

- (void)mutualDeleteDialog:(QBChatDialog *)dialog success:(void (^) ())successBlock failure:(void (^)(NSError *))failureBlock {
  QBChatMessage *deleteMessage = [self generateDeleteDialogMessage:dialog];
  [self sendMessage:deleteMessage success:^{
    [QBChat deleteDialogWithID:dialog.ID delegate:self];
  } failure:^(NSError *error) {
    failureBlock(error);
  }];

The deleteDialogWithID method calls a third party service and calls a delegate method when complete. When this delegate method is called I want to return the success/failure block to the caller of my original method...is this possible and how can I do it?

i.e.

//Delegate Method
- (void)completedWithResult:(QBResult *)result {
  successBlock();
}

Answer 1

If you can guarantee that there's exactly one of these at a time, you could add a property to your class:

@property (copy) void(^successBlock)();

and then in mutualDeleteDialog:

self.successBlock = successBlock;

and then in completedWithResult:

self.successBlock();

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This is pretty unconventional. You may want to reevaluate what it is you're trying to do. There might be a better way.