Xcode 8及之前的版本是可以直接在iTunes Connect上添加App icon。而Xcode 9则是把App icon放置在项目的asset catalog。
在Info.plist 添加key CFBundleIconName:
<key>CFBundleIconName</key>
<string>AppIcon</string>
在项目的asset catalog添加图标：
需要添加以下尺寸的图标：
- 20pt 1x, 2x, 3x
- 29pt 1x, 2x, 3x
- 40pt 1x, 2x, 3x
- 60pt 1x, 2x, 3x
- 76pt 1x, 2x
- 85.5pt 2x
- 1024pt 1x
如果没有正确添加iOS App图标，上传到App Store后可能会受到拒绝邮件，大概内容如下：
Dear developer,
We have discovered one or more issues with your recent delivery for "". To process your delivery, the following issues must be corrected: Missing Info.plist value - A value for the Info.plist key CFBundleIconName is missing in the bundle ''. Apps that provide icons in the asset catalog must also provide this Info.plist key. For more information seehttp://help.apple.com/xcode/mac/current/#/dev10510b1f7. Once these issues have been corrected, you can then redeliver the corrected binary. Regards, The App Store team