Why you need to set up two copies of the same image resource for the bundle and app in Xcode

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We know that in the bundle of app settings sometimes use the image resources, and in the app we tend to use the same image resources, but we tend to use the image resources copied into 2, respectively, in the bundle and the app folder, then this is why?

Why can't we just use the same image resource?

The answer is simple, because apps on iOS can't read files from the other app's sandbox, and the bundle isn't part of our app sandbox, it's part of the app sandbox. So if we want to use these resources in our own apps, We also have to copy them into our app's own folder.

That ' s why! ;)

Why you need to set up two copies of the same image resource for the bundle and app in Xcode