/**
* 屏幕宽高比
* -------------------------------------------------------------------------------
*| Device | 尺寸 | 开发尺寸 (pt) | 像素尺寸 (px) | 宽高比 | 倍图 | 像素密度 (ppi) |
* ------------------------------------------------------------------------------
*| 4/4S | 3.5 | 320x480 | 640x960 | 1.5 | @2x | 326 |
* -------------------------------------------------------------------------------
*| 5/5S/5C | 4.0 | 320x568 | 640x1136 | 1.78 | @2x | 326 |
* -------------------------------------------------------------------------------
*| 6/6S/7/8 | 4.7 | 375x667 | 750x1334 | 1.78 | @2x | 326 |
* -------------------------------------------------------------------------------
*| 6/7/8(Plus) | 5.5 | 414x736 | 1242x2208 | 1.78 | @3x | 401 |
* -------------------------------------------------------------------------------
*| X | 5.8 | 375x812 | 1125x2436 | 2.17 | @3x | 458 |
* -------------------------------------------------------------------------------
*| XS | 5.8 | 375x812 | 1125x2436 | 2.17 | @3x | 458 |
* -------------------------------------------------------------------------------
*| XS Max | 6.5 | 414x896 | 1242x2688 | 2.16 | @3x | 458 |
* -------------------------------------------------------------------------------
*| XR | 6.1 | 414x896 | 828x1792 | 2.16 | @2x | 326 |
* -------------------------------------------------------------------------------
*/
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