https://blog.wongcw.com/2019/03/26/iphone%e5%8d%87%e7%b4%9aios-12-2%e5%be%8catt%e7%94%a8%e6%88%b6%e6%88%96%e8%a6%8b%e5%88%b0%e8%aa%a4%e5%b0%8e%e6%80%a7%e7%9a%845g-e%e4%bf%a1%e8%99%9f%e6%ac%84/