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下面是关于屏幕尺寸的信息。这些细节摘自苹果官网

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

为了获得适当大小的屏幕截图，而无需手动创建它们——在最新版本的Xcode中运行你的应用，并选择你需要截图的iPhone，然后在查看模拟器时点击cmd-s。这将保存一个完整分辨率的截图到你的桌面，你需要提交。

正如下面@HoffZ所指出的，确保比例设置为100%。

在Xcode中选择模拟器:

在模拟器菜单中将比例设置为100%:

按cmd-s保存:

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。

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

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”