Apple is struggling in China as sales decline amid cutthroat competition with domestic brands, but CEO Tim Cook says he is confident of a rebound on the back of rising demand for the iPhone 17 line-up.The US tech giant’s revenue in Greater China, which covers mainland China, Hong Kong and Taiwan, dropped 4 per cent year on year to US$14.5 billion in the three months ended September, the company reported on Thursday.On a conference call with analysts, Cook attributed China’s sales weakness to...