我可以使用圆形 iPhone 应用程序图标吗?

Can I use a circular iPhone app icon?

显然图像文件本身是 120x120,但内部是完全透明正方形中的圆圈。

我应该要求完整的方形图标吗?

因为客户的原因,我不想分享我的图标。

答案是 "soft no" -- 来自 HIG:

Avoid transparency. An app icon should be opaque. If the icon’s boundaries are smaller than the recommended sizes—or you use transparency to create “see-through” areas—the resulting icon can appear to float on a dark background, which tends to look especially unattractive on the beautiful wallpapers that users choose.

基本上,它看起来会非常错误和糟糕。一个选项是为应用程序图标选择纯色背景字段颜色,然后在上面加上圆圈。