I ran into the same question and found a different solution that works for me.
I use the classic"old school" approach for turning async operations into a sync flow by using a semaphore as follows:
// create the object that will perform an async operation
MyConnection *conn = [MyConnection new];
STAssertNotNil (conn, @"MyConnection init failed");
// create the semaphore and lock it once before we start
// the async operation
NSConditionLock *tl = [NSConditionLock new];
self.theLock = tl;
[tl release];
// start the async operation
self.testState = 0;
[conn doItAsyncWithDelegate:self];
// now lock the semaphore - which will block this thread until
// [self.theLock unlockWithCondition:1] gets invoked
[self.theLock lockWhenCondition:1];
// make sure the async callback did in fact happen by
// checking whether it modified a variable
STAssertTrue (self.testState != 0, @"delegate did not get called");
// we're done
[self.theLock release]; self.theLock = nil;
[conn release];
Make sure to invoke
[self.theLock unlockWithCondition:1];
In the delegate(s) then.
