Apple Software Engineer Applications interview questions

First round interview(no online assessment whatsoever). Call me through FaceTime. Ask basic questions about my experience and personal information. Ask a simple question about App interface design problem.

Phone screen then onsite interview. 2-3 puzzle questions then coding a red black tree with a loop in language of choice. Then analyze Olog(n). Coded in front of a panel of engineers on white board with 20 minutes on the clock. Called back to interview with manager four weeks later, but I had accepted another offer.