1)iPhone X screenshot support in iTunes Connect.October 27, 2017.

 2)You can now upload screenshots for iPhone X. 
  You’ll see a new tab for 5.8-inch displays under Screenshots and App Previews on your iOS app  version information page.

 3)Note that iPhone X screenshots are optional and cannot be used for smaller devices sizes. 
  5.5-inchdisplay screenshots are still required for all apps that run on iPhone.

 4)iPhone X Screenshot Resolutions
  1125 by 2436 (Portrait)
  2436 by 1125 (Landscape)

 1)iPhone X screenshot support in iTunes Connect.October 27, 2017.

 2)You can now upload screenshots for iPhone X. 
  You’ll see a new tab for 5.8-inch displays under Screenshots and App Previews on your iOS app  version information page.

 3)Note that iPhone X screenshots are optional and cannot be used for smaller devices sizes. 
  5.5-inchdisplay screenshots are still required for all apps that run on iPhone.

 4)iPhone X Screenshot Resolutions
  1125 by 2436 (Portrait)
  2436 by 1125 (Landscape)

截至2017年6月14日更新，来源如下: http://help.apple.com/itunes-connect/developer/#/devd274dd925

截图说明

5.5-Inch Retina Display 1242 x 2208 pixels for portrait 2208 x 1242 pixels for landscape 4.7-Inch Retina Display 750 x 1334 pixels for portrait 1334 x 750 pixels for landscape 4-Inch Retina Display 640 x 1096 pixels for portrait (without status bar) 640 x 1136 pixels for portrait (full screen) 1136 x 600 pixels for landscape (without status bar) 1136 x 640 pixels for landscape (full screen) 3.5-Inch Retina Display 640 x 920 pixels for portrait (without status bar) 640 x 960 pixels for portrait (full screen) 960 x 600 pixels for landscape (without status bar) 960 x 640 pixels for landscape (full screen) 12.9-Inch Retina Display 2048 x 2732 pixels for portrait 2732 x 2048 pixels for landscape 9.7-Inch Retina Display High Resolution: 2048 x 1496 pixels for landscape (without status bar) 2048 x 1536 pixels for landscape (full screen) 1536 x 2008 pixels for portrait (without status bar) 1536 x 2048 pixels for portrait (full screen) Standard resolution: 1024 x 748 pixels for landscape (without status bar) 1024 x 768 pixels for landscape (full screen) 768 x 1004 pixels for portrait (without status bar) 768 x 1024 pixels for portrait (full screen) macOS One of the following, with a 16:10 aspect ratio. 1280 x 800 pixels 1440 x 900 pixels 2560 x 1600 pixels 2880 x 1800 pixels tvOS 1920 x 1080 pixels watchOS 312 x 390 pixels

这个答案是更新的Xcode 13。

App Store Connect目前要求以下类别的图像:

iPhone 6.7”显示屏

这是1290 x 2796像素。您可以使用以下模拟器来创建这些截图:

iPhone 14 Pro Max

iPhone 6.5”显示屏

这是1242 x 2688像素。您可以使用以下模拟器来创建这些截图:

iPhone 13 Pro Max iPhone 12 Pro Max iPhone 11 Pro Max iPhone XS Max iPhone XR

iPhone 5.5”显示屏

这是1242 x 2208像素。您可以使用以下模拟器来创建这些截图:

iPhone 8 Plus iPhone 7 Plus iPhone 6s Plus

iPad Pro(第三代)12.9英寸显示屏

这是2048 x 2732像素。您可以使用iPad Pro(12.9英寸)(第五代)模拟器创建此大小的图像。

iPad Pro(第二代)12.9英寸显示屏

这是2048 x 2732像素。这是与iPad Pro(12.9英寸)(第五代)完全相同的尺寸，所以大多数人可以在这里使用相同的截图。但是看看这个。

笔记

Data source: Official Screenshot specifications page on the Apple site. Thanks to this answer for the link. Not all of the devices listed above produce the exact pixel dimensions listed, but Apple seems to accept the proportions. Use File > New Screen Shot (Command+S) in the simulator to save a screenshot to the desktop. On a real device press Sleep/Wake+Home on the iPhone/iPad (images available in Photo app) The pixel dimensions above are the full screen portrait orientation sizes. You shouldn't include the status bar, so you can either paste background color over the status bar text and icons or crop them out and scale the image back up.

对于iPhone 5.5”显示器，你需要在iPhone 8 Plus上将模拟器更改为“物理大小”

我知道有很多精心设计的答案。我从苹果网站上找到了一个正确的文档，他们已经指定了截图要求的规范。下面是链接 https://help.apple.com/app-store-connect/#/devd274dd925