I also tried exporting without alpha it did not work for me but I figured it out that why I was getting error. I create an AppIcon using Figma & Sketch, but I tried to make a 2D geometry shape to 3D viewable. So I assume that I can achieve it by using some shadows & the same geometry but with lower alpha-like %70. After that, I got the AppIcon and export it without Alpha ticking but the problem was the main source of the image includes a container with lower alpha-like I did. So I change it to another graphical shape without alpha and it worked.

如果ionic3项目在上传到iTunes Connect时显示此错误，请检查此答案

这是我的项目错误，当我试图诋毁。

最后遵循这个答案，错误解决了。

使用Alpha通道移除器。它可以让你把图标拖到应用程序中，它会消除透明度。

从这里下载:http://alphachannelremover.blogspot.com

更新:这不是我的网站

错误信息本身是这样的:

“无效的应用商店图标。在资产目录中的应用程序商店图标 “YourApp。应用不能透明，也不能包含alpha通道。”

所有应用程序图标必须是方形的，不透明或半透明(alpha值!= 1.0)。

提示:应用程序图标可能有圆角。(在这里分享你的应用程序图标)

以下是苹果应用程序图标-人机界面指南

I also tried exporting without alpha it did not work for me but I figured it out that why I was getting error. I create an AppIcon using Figma & Sketch, but I tried to make a 2D geometry shape to 3D viewable. So I assume that I can achieve it by using some shadows & the same geometry but with lower alpha-like %70. After that, I got the AppIcon and export it without Alpha ticking but the problem was the main source of the image includes a container with lower alpha-like I did. So I change it to another graphical shape without alpha and it worked.

我还shell脚本使用ffmpeg调整图像大小没有阿尔法通道。它适用于png格式。

# Export ios app icons by ffmpeg scale command
# usage: sh export_ios_icons.sh {path_to_your_img}
# example: sh export_ios_icons.sh ./app_icon.png

# sizes of images
# you can get other size images by editing thisarray
size=(20 40 60 29 58 87 80 120 180 76 152 167 1024)
for i in "${size[@]}"
do
   : 
    ffmpeg -i $1 -vf scale=$i:$i output_$ix$i.png
done