I'm a big fan of all of the Big Nerd Ranch books. Also, Objective-C is pretty simple to learn, the real hurdle is learning the Cocoa/Cocoa Touch framework in addition to others. I would recommend the BNR books (they have one on iOS programming as well as one that teaches Objective-C) as well as watching the video lectures from Stanford since your focus is learning to program for iOS.
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I'm a big fan of all of the Big Nerd Ranch books. Also, Objective-C is pretty simple to learn, the real hurdle is learning the Cocoa/Cocoa Touch framework in addition to others. I would recommend the BNR books (they have one on iOS programming as well as one that teaches Objective-C) as well as watching the video lectures from Stanford since your focus is learning to program for iOS.