https://blog.wongcw.com/2018/09/20/ios-12-1-%e6%96%b0%e8%af%81%e6%8d%ae%e8%a1%a8%e6%98%8e-ipad-pro-%e5%b0%86%e6%94%b9%e7%94%a8-usb-c-%e7%ab%af%e5%8f%a3/