Apple Inc (AAPL.O) forecast its first revenue drop in 13 years and reported the slowest-ever growth in iPhone shipments as the critical Chinese market showed signs of weakening, suggesting the technology company’s period of exponential growth may be ending. “It’s disappointing to see them miss on an already downward adjusted sales number and the fact is that with their iPhone growth slowing what was needed was a product to be excited about,” said J.J. Kinahan, chief strategist at TD Ameritrade. The most valuable publicly traded U.S.