https://blog.wongcw.com/2018/12/29/%e8%b2%b7iphone-xr%e7%9a%84%e5%ae%89%e5%8d%93%e5%8f%9b%e9%80%86%e7%94%a8%e6%88%b6%e5%a4%9a%e4%bd%86%e8%87%aa%e5%ae%b6%e5%b0%91%e4%b8%80%e9%bb%9e/