iPhone开发逻辑分辨率

逻辑分辨率（iOS开发及设计人员使用）：

2008-2011
iPhone 4s/4/3GS/3G: {{0, 0}, {320, 480}}  宽高比   0.666

2012-2013
iPhone 5/5S/5c/SE: {{0, 0}, {320, 568}}     0.5633

2014
iPhone 6：      {{0, 0}, {375, 667}}     0.5622
iPhone 6Plus：  {{0, 0}, {414, 736}}     0.5625

2015
iPhone 6s：     {{0, 0}, {375, 667}}
iPhone 6s Plus：{{0, 0}, {414, 736}}

2016
iPhone 7：      {{0, 0}, {375, 667}}
iPhone 7Plus：  {{0, 0}, {414, 736}}

2017
iPhone 8：       {{0, 0}, {375, 667}}
iPhone 8Plus：   {{0, 0}, {414, 736}}
iPhone X         {{0, 0}, {375, 812}}       0.4618

2018
iPhone XS       {{0, 0}, {375, 812}}
iPhone XS MAX   {{0, 0}, {414, 896}}        0.4620
iPhone XR       {{0, 0}, {414, 896}}