We've been writing Apps a long time now, back since early 2009 and have picked up quite a few tips and tricks on our journey through the whole iOS experience. We wouldn't swap it for any other platform and Android is a dirty word here at FiddleMeRagged central.
Here's a collection of things that came in handy, from the basic to the advanced. We'll add to the list when time permits, so watch this space. We'll also link to anything interesting we find on Stack Overflow - our best resource.
Using NSString (conveting between NSString and numbers and various tests for situations)