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Well, that’s everything you will ever need to know to write brilliant applications for iOS and Mac OS X.
That’s what I wish I could tell you. I know you have worked hard to get to this point.
The truth is that you have completed the first leg of a fun and rewarding journey. It is, however, a very long journey. It is now time for you to spend some time studying the standard frameworks that Apple makes available to Objective-C developers like you.
Let me repeat that last phrase so you can relish it: “Objective-C developers like you.” Congratulations.
If you are learning to develop applications for iOS, I recommend that you work through iOS Programming: The Big Nerd Ranch Guide, but there are several other books on iOS, and you are ready for any of them.