苹果官方介绍
https://developer.apple.com/watchos/
WatchKit苹果官方文档
https://developer.apple.com/documentation/watchkit
WatchConnectivity苹果官方文档
https://developer.apple.com/documentation/watchconnectivity
watchOS Release Notes苹果官方文档
https://developer.apple.com/documentation/watchos_release_notes