I'm tempted to provide the highest resolution icon and let iOS scale it down as necessary. Is this a bad idea, and (if so) why?
答案 0 :(得分：1)
Yes, it might be bad idea. If your icon art was produced using a vector image editor (e.g., Adobe Illustrator, Adobe Photoshop with vector primitives, Sketch, etc) you best bet is to export all required resolutions yourself. In doing so, you will guarantee the best possible output for each resolution.
Keep in mind that exporting a single high resolution image and then resizing, for each required resolution, using a bitmap editor (e.g., macOS Preview) won't produce the same results.
PS. As already pointed out, I'm not sure your binary will even be accepted by Apple if missing icon data :-(
答案 1 :(得分：1)
您肯定希望根据xCode的要求生成各种大小的文件。您希望确保应用程序运行时显示的文件质量很高。
有些工具可以自动创建应用图标所需的所有尺寸。以下是我使用的网站的链接：https://makeappicon.com/
希望有所帮助！