I have search a lot for iPhone material to get started, but I found most of the stuff that divided either in iPhone development or in learning Objective-C only.
Can someone please send me links/ebooks/articles/videos where once can learn Objective-C and iPhone together?
It is arguably better if you learn objective-c before delving into the iphone framework (Cocoa Touch and associated frameworks). The iphone sdk is built around objective-c and a firm understanding of the language is absolutely essential for understanding the documentation about how to use the iphone sdk.
Having said that, an excellent book that teaches objective-c and then provides an introductiojn to iphone programming is Kochan’s Programming in Objecitve-C This will get you up and running with objective-c in a minimal amount of time, after which you can start with Beginning iPhone 3 Development for a thorough coverage of the main iphone sdk paradigms.