You might want to sign up for Apple's dev account. With that you get full access to the WWDC. The 2012 is out now and if you watch the Modern Object C and other "developer tools" Videos, you'll get a lot of insight into what the tools are and what they do.
The reason for suggesting this is that C++ is gaining more and more support by the compiler.
The usual path has been learn ObjC, Xcode, iOS, APIs, and start writing sample code and read books.
You can dig right into the dev account and watch the WWDC and install Xcode, buy a few books and jump right in. Big Nerd Ranch has a very good book on ObjC.
You might want to watch the WWDC2012 1st because things are changing. ARC is pretty much standard now, so you can skip over the older memory retain/release that many books cover. ARC is just one example of the changes, so getting a new book / tutorial can be important.
It might seem confusing at 1st, books cover Reference Counting, then you learn it's now automatic(ARC) so you don't have to learn it...
Taking some time to find where things stand, can save you a bunch of time learning things that are being replaced.
Dev accounts cost $99/yr so it's about the cost of a lunch each month.
Check the dates of books/blogs/tutorials, they tend to get out dated quick.
