Apple Software Engineer interview questions

I have applied through the website. After few weeks a recruiter for that group contacted me via email and scheduled a phone conversation with her. After she scheduled a phone interview with the hiring manager that was about 1 hour technical discussion. I had another phone interview with another person for about 1 hour. Then they invited me onsite for a full day of interviews with 5 or more engineers, one hour each. Topics ranged from Cocoa development, software architecture, but most of interviews was knowledge-specific in detail. So my advice is to know your stuff.