It would be easier to pickup ObjC while you are at C++ than to switch back from a web development background. Once ObjC is under your belt try to get some basic understanding of iOS development in general.

Then you can watch a few of the videos that kind of gives you a hands-on feeling since some of the drag/drop, ctrl-drag are something to see rather than to read and keep in mind. Rory Lewis and AzamSharp videos helped me a lot while Ray Wenderlich book gave some nice step-by-step instructions.

Armed with these you basically should start a real project of yours so you can learn things on the fly and those would last in your memory longer than any tutorials. Good luck! Believe me....it's hard but not crazy.