In iOS apps, what's the difference between the main package and the document catalog?

Question

Can someone explain this to me?

I want to know the difference between them regarding things like:

• The amount of space taken from the device (for example, the application is active or terminated).
• Memory usage.
• The ability to read and write data (at the end of the user).
• What remains and what is deleted (or changed) when the application: Updated from Appstore / Deleted.

And any other details that you may need.

Answer 1

mainBundle is an installed application

• this is the size of the extracted ipa (you can see this in xcode in advance)
• it is ReadOnly and will not contain user files (e.g. documents).
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• ReadWrite

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