Question

Is there any way that I can have a method sleep until a notification is posted? This is for an asynchronous NSURLConnection. I cannot move to a synchronous connection for multiple reasons.

Answer 1

Methods cannot “sleep”; that only applies to threads. Just split the code that needs to wait out into another method and have that method called when the notification arrives.

- (void) doStuffBeforeConnection {

    [self doPreConnectionStuff];

    NSURL * url = [NSURL URLWithString:@"/U/R/L"];

    NSURLRequest * request = [NSURLRequest requestWithURL:url
                                            cachePolicy:NSURLRequestReturnCacheDataElseLoad
                                         timeoutInterval:0];
    NSURLConnection * conn = [NSURLConnection connectionWithRequest:request
                                                         delegate:self];

    return;
    // We are now "waiting"...
}

- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {

    [self nowDoStuffThatNeededToWait:response];
}