https://github.com/calda/WatchKitTimePicker これ使いたいけど、CocoaPodではなくてCarthage（カルタゴ） brew install carthage carthage bootstrap --platform watchOS してから carthage update --platform watchOS

Swift UI https://developer.apple.com/tutorials/swiftui/creating-a-watchos-app 古い？TODO https://pusher.com/tutorials/to-do-list-apple-watch#building-our-watchos-app Qiita watchOS 6 の注目点をふまえてSwiftUIでWatch Appを作ってみた!! - Qiita