If you are developing an iOS app yourself, there will probably be a point where you get stuck and cannot find the answer to your development question through Google searches. Bookmark this page and any time you get to that point, you can just go down the list and you should be able to get an answer on one of these forums. Also remember that the more you put in, the more you usually get out, so take the time to help people too.
You might know MacRumors as an Apple news and rumors website, but also have a fairly active iPhone and iPad Programming Forum too. Most threads have at least 2 or 3 replies and there are a wide variety of topics, so it is definitely worth posting your question.
This is one of the most active technical Q&A sites out there and was started by Jeff Atwood and Joel Spolsky in 2008. Search the iOS tag to see if your question has already been answered because it is very likely that it has. If you ask a question without doing a search first and it has already been answered, be prepared to hear about it. You can also check out the iPad and iPhone tags to see if there is any other information that you may have missed.
Ray's forum is very no nonsense. There are only three main topics: General Discussion, Official Tutorials (questions about the tutorials on his site) and Tips/Tricks/Advice. You have probably seen at least one of their tutorials at some point, so you know that he and his writers know their stuff. His site is a tremendous developer resource. The only downside? The text on his site sometimes line breaks in the middle of words. We can live with that.
Like MacRumors, you may think that InsanelyMac is just a news site, but it does have a large and active forum, complete with an iOS developers section. Be sure to explore the rest of the forum also, because there are a wide range of topics and there are even discussions in a variety of different languages.
Let's not forget about the Apple Developer Forums. Get responses from fellow developers and Apple Engineers. The nice thing is that you need to be a registered developer to post on the forum, so there is less chance of spam. But you knew that already.
This is an active community of developers and app marketers and there are a wide variety of topics. Definitely worth checking out and asking your question.
This is not actually a forum, but we feel that it is still a great resource for getting your development questions answered. Clarity.fm is a site where you can find iOS developers who charge by the minute for phone consultations.
Prices start at $1 per minute, so if you have a short question, it can be very inexpensive to get your question answered. Schedule calls with multiple developers if you need a second or third opinion.
There are also Facebook and LinkedIn groups that might be able to help you. The only trouble with a lot of these groups is that you have to sort through a lot of groups to find the ones where developers really help each other out and are not just pitch-fests. Also look for developers on Twitter and see if they would be willing to help you out or at least point you in the right direction. But since these options take a lot more time, give the seven resources mentioned above a shot first.
Do you have any other good general developer resources? Leave a comment and let us know.