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”

这些细节由日志给出…

iPhone 6 Plus

Screen bounds: {{0, 0}, {414, 736}}, Screen resolution: <UIScreen: 0x7f97fad330b0; bounds = {{0, 0}, {414, 736}}; 
mode = <UIScreenMode: 0x7f97fae1ce00; size = 1242.000000 x 2208.000000>>, scale: 3.000000, nativeScale: 3.000000

iPhone 6

Screen bounds: {{0, 0}, {375, 667}}, Screen resolution: <UIScreen: 0x7fa01b5182d0; bounds = {{0, 0}, {375, 667}}; 
mode = <UIScreenMode: 0x7fa01b711760; size = 750.000000 x 1334.000000>>, scale: 2.000000, nativeScale: 2.000000

在Xcode 9中，除了将窗口比例设置为100%(⌘1)外，现在还需要在调试菜单中取消选择窗口比例的优化呈现，以便获得适当分辨率的截图。

要截取应用商店中使用的适当大小的截图:

1)。在模拟器中运行应用程序 2)。设置刻度(⌘1) 3)。取消选中优化渲染窗口缩放调试菜单 4)。使用⌘S进行截图

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.

 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)

另外，请注意，你可以设置透明度，即使你的图像实际上没有任何透明度。如果你用的是photoshop，选择“保存为网页格式”，取消选择“透明”，或者直接将图片转换成jpg格式。iTunes Connect似乎也拒绝透明度。