As I an iOS developer, I believe it is my duty to share or help other developers to find the resources that they need for their learning and development. So I am starting this post and I going to put links to the different tutorials and sites that gave me useful information and which can be useful to others…so here we go

Some of the best

http://www.raywenderlich.com/tutorials

http://www.appcoda.com/ios-programming-course/
http://www.edumobile.org/iphone/iphone-programming-tutorials/

Old but good
http://www.cocoawithlove.com/2009/04/easy-custom-uitableview-drawing.html

OpegGL iPhone Gaming
http://www.71squared.com/en/article/857/iphone-game-programming-tutorial-2-image-class

List of standard URL Type Identifiers
https://developer.apple.com/library/ios/documentation/Miscellaneous/Reference/UTIRef/Articles/System-DeclaredUniformTypeIdentifiers.html#//apple_ref/doc/uid/TP40009259-SW1

Share Data
http://enharmonichq.com/sharing-data-locally-between-ios-apps/

Blocks
http://yannickloriot.com/2011/11/working-with-blocks/#sthash.kEvsGfcl.pGeeYUmj.dpbs

Callbacks Using blocks

CallbacksWithBlocks 2

CallbacksWithBlocks3

Core Animations
http://www.mobileaware.com/core-animation-tutorials/

Reusable Controls
A huge list of reusable controls with source code

again there are more but these are some that I came across.