Apple published a great doc for newcomers. It’s also a good source of links and articles for all the basics in iOS, from enrolling as developer to publish your first app.
Find all related docs links below:
- Tutorial: Your first iOS app
- Manage your workflow in XCode
- Write Objective-C code
- Acquire basic programming skills
- Survey the major frameworks
- Integrate your code with the frameworks
- Streamline your app with design patterns
- Design with the user in mind
- Design your app with care
- Know the core objects of your app
- Prepare for App Store submission
- Find documentation quickly
- iOS technology overview
- iOS Human Interface Guidelines
- Developing for the App Store
- The Objective-C programming language
- Concepts in Objective-C programming
- iOS App Programming Guide
- App Store Review Guidelines