overview-develop 1. Develop Develop your application with the iOS SDK and a wealth of technical resources in the iOS Dev Center. Learn more

With the iOS SDK, you can get started developing your iOS application for iPad, iPhone, and iPod touch today. Access the iOS Dev Center for a wealth of resources including videos, sample code, technical documentation, Apple Developer Forums, and more.

Development Tools in the iOS SDK

Development Resources

Xcode

Complete development environment provides project management, a powerful source editor, and a graphical debugger.

Apple Developer Forums

Post iOS SDK development topics and questions for an open discussion with other iOS developers and Apple engineers.

iOS Simulator

Run, test, and debug your application locally on your Mac using a simulated iPhone and iPad.

Getting Started Videos & Documents

Cover a range of topics, from tools and frameworks to development best-practices and design methods.

Instruments

Collect, display, and compare performance data graphically in real-time to optimize your application.

iOS Developer Library

A rich collection of documentation, guides, and articles categorized so you can quickly find the information you’re looking for.

Interface Builder

Interface Builder makes designing a user interface as easy as drag and drop.

Coding Resources

Inspire your own development with a library of sample code and Coding How-To’s. Use these examples to add new functionality or to enhance your application’s current design.

Source used: http://www.apple.com

special thanks to Apple!