Can someone please explain it to me?
I want to know the difference between them regarding things like:
- The amount of space taken from the device (wether the the app is active or terminated).
- Memory usage.
- The ability to read and write data (on the user's end).
- What stays and what gets removed (or changed) when the app is: Updated form the Appstore/ Deleted.
And any other details you may find necessary.
the mainBundle is the installed app
- it is the size of the extracted ipa (you can see that in xcode beforehand)
- it is ReadOnly and won't contain user files (e.g. documents)
- deleted with your app (it is the app)
- when updating from the App Store, older ioses replace the whole bundle, downloading it as a whole. newer oses 6+ IIRC, do delta updates, only downloading changed files. you can't say how much is downloaded -- at least the amount of bytes you changed.
the documents dir is where your user generated contents are stored.
- Its size depends on what your user/your app creates as documents ;) it starts with 0 mb
- It is ReadWrite
- deleted with your app
- remains untouched by updates
that answers question 1 and 3 and 4
question 2 is wrong .. a filesystem folder doesn't consume memory unless files are loaded by the app/the os
- the os obviously loads the necessary parts of your app and the required frameworks
- your app can load documents.
memory usage is only vaguely / not really related to file size
