If you're on macOS, Apple's docs are best viewed through Dash. While it can't overcome the documentation's fundamental lack of visibility into inherited API, it

If you're on macOS, Apple's docs are best viewed through Dash. While it can't overcome the documentation's fundamental lack of visibility into inherited API, its search and presentation are fantastic. If you're not on macOS and just searching open source Swift docs, try swiftpackageindex.org and swiftinit.org. Swift Init especially has fast rendering and better search, though ultimately is based off the same inline docs as Apple's.