What is the best book of objective c and from where i can download it?

what is the best book of objective c and from where i can download it?

Before purchasing a book be sure to exhaust the excellent resources on the Apple Developer Site. There are quite a few guides, references, and samples for Objective-C.
Learning Objective-C: A Primer
The Objective-C Programming Language
Object-Oriented Programming with Objective-C
etc.
If you are developing for Mac or iOS, there are plenty of other documents describing the frameworks, including the Cocoa Fundamentals Guide,  iOS App Programming Guide, etc.
If you want to create iOS apps, start here.
Start Developing iOS Apps Today

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