American west coast time on June 2, 2014, Apple held WWDC in Moscone Center as scheduled. While the long-expected iPhone 6 and iWatch didn’t show up, Apple’s chief executive Tim Cook announced the launch of new OS X 10.10 and iOS 8. OS X 10.10 is designed to be more flat of course, and the new system is named as Yosemite. It adopts a more friendly user interface and is added more functions. Main changes are as follows.
