https://blog.wongcw.com/2018/11/09/ios-12-1%e6%96%b0%e5%a2%9eemoji%e8%aa%bf%e6%9f%a5%ef%bc%9a%e6%8e%a8%e7%89%b9%e7%b6%b2%e5%8f%8b%e6%9c%80%e5%96%9c%e6%ad%a1%e7%94%a8%e7%a6%bf%e9%a0%ad%e7%ad%89%e8%a1%a8%e6%83%85/