What's in my iOS toolbox? 
I'd recommend <a href="http://www.objc.io/" rel="nofollow">http://www.objc.io/</a> under Continuous Learning. <a href="http://www.mobile-patterns.com/" rel="nofollow">http://www.mobile-patterns.com/</a> is also good for design/inspiration, curated by a former Foursquare designer