https://blog.wongcw.com/2018/11/02/ios-12-1%e6%9b%9d%e5%87%ba%e7%be%a4%e7%bb%84%e8%a7%86%e9%a2%91%e9%80%9a%e8%af%9d%e5%8a%9f%e8%83%bdbug-%e6%b3%84%e9%9c%b2iphone%e8%81%94%e7%b3%bb%e4%ba%ba%e8%af%a6%e6%83%85/