https://kaleidalabs.blog/2013/11/17/ios-7-0-4%e3%81%a7%e3%82%82%e8%a7%a3%e6%b1%ba%e3%81%95%e3%82%8c%e3%81%aa%e3%81%84hdr%e3%82%aa%e3%83%95%e5%95%8f%e9%a1%8c/