ios引导页与应用图标尺寸整理

常用引导页尺寸：

Xs max 1242x2688

Xs 1125x2436

X 1125x2436

Xr 828x1792

Retina hd 5.5 1242x2208

Retina hd 4.7 750x1334

2x 640x960

Retina 4 640x1136

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Ios应用图标尺寸

1024px 1x

83.5px 2x

76px 1x 2x

60px 2x 3x

40px 1x 2x 3x

29px 1x 2x 3x

20px 1x 2x 3x