苹果设备3.5英寸，4英寸，4.7英寸，5.5英寸屏幕像素指南

由于开发的时候老是记不住各个设备屏幕尺寸对应的像素，特此在苹果开发者文档上将这些记录了下来，方便查阅.

• iPhone8 5.8-inch:       2436×1125
• iPhone5 5.5-inch:       2208 x 1242
• iPad (9.7):                  2048x1536
• iPad (12.9):                2732x2048

Device	Specifications	Editable
3.5-Inch Retina Display Screenshots(required)	One screenshot is required. Up to four additional screenshots can be uploaded. You can rearrange the screenshots when you create or edit the iTunes Connect record. Don’t include the device status bar in your screenshots. Screenshot requirements are: 72 dpi, RGB, flattened, no transparency High-quality JPEG or PNG image file format Any of the following sizes: 640 x 920 pixels for hi-res portrait (without status bar) minimum 640 x 960 pixels for hi-res portrait (full screen) maximum 960 x 600 pixels for hi-res landscape (without status bar) minimum 960 x 640 pixels for hi-res landscape (full screen) maximum	Locked
4-Inch Retina Display Screenshots (Required)	You’re required to upload at least one of these screenshots. Up to four additional optional screenshots can be uploaded. You can rearrange the screenshots when you create or edit the iTunes Connect record. Don’t include the device status bar in your screenshots. Screenshot requirements are: 72 dpi, RGB, flattened, no transparency High-quality JPEG or PNG image file format Any of the following sizes: 640 x 1096 pixels for portrait (without status bar) minimum 640 x 1136 pixels for portrait (full screen) maximum 1136 x 600 pixels for landscape (without status bar) minimum 1136 x 640 pixels for landscape (full screen) minimum	Locked
4.7-inch Retina screenshot	If your app indicates that it is optimized for the iPhone 6, at least one 4.7-inch screenshot is required. Up to four additional screenshots can be uploaded. You can rearrange the screenshots when you create or edit the iTunes Connect record. Don’t include the device status bar in your screenshots. Screenshot requirements are: 72 dpi, RGB, flattened, no transparency High-quality JPEG or PNG image file format 750 x 1334 pixels for hi-res portrait 1334 x 750 pixels for hi-res landscape	Locked
5.5-inch Retina screenshot	If your app indicates that it is optimized for the iPhone 6 Plus, at least one 5.5-inch screenshot is required. Up to four additional screenshots can be uploaded. You can rearrange the screenshots when you create or edit the iTunes Connect record. Don’t include the device status bar in your screenshots. Screenshot requirements are: 72 dpi, RGB, flattened, no transparency High-quality JPEG or PNG image file format 1242 x 2208 pixels for hi-res portrait 2208 x 1242 pixels for hi-res landscape	Locked
iPad Screenshots(required if app runs on iPad)	If your binary indicates that your app runs on iPad, you’re required to upload at least one iPad screenshot. Up to four additional screenshots can be uploaded. You can rearrange the screenshots when you create or edit the iTunes Connect record. Don’t include the device status bar in your screenshots. Screenshots requirements are: 72 dpi, RGB, flattened, no transparency High-quality JPEG or PNG image file format Any of the following sizes: 1024 x 748 pixels for landscape (without status bar) minimum 1024 x 768 pixels for landscape (full screen) maximum 2048 x 1496 pixels for hi-res (without status bar) minimum 2048 x 1536 pixels for hi-res landscape (full screen) maximum 768 x 1004 pixels for portrait (without status bar) minimum 768 x 1024 pixels for portrait (full screen) maximum 1536 x 2008 pixels for hi-res portrait (without status bar) minimum 1536 x 2048 pixels for hi-res portrait (full screen) maximum	Locked