https://blog.wongcw.com/2018/10/03/%e8%8b%b9%e6%9e%9c%ef%bc%9aios-12-1%e5%b0%86%e5%8a%a0%e5%85%a570%e5%a4%9a%e4%b8%aa%e6%96%b0emoji%e8%a1%a8%e6%83%85/