How to use Xcode to open decrypted IPA contents
I have a decrypted IPA file. How do I use Xcode to open the contents of this file and make code modifications to it?
An IPA is just a zip file containing a "Payload" folder, which in turn contains the app bundle. As such there is no code in an IPA - just the compiled executable. You can unzip it and look in the "Payload" folder, but all you'll see is executable code. You could possibly disassemble the code (don't ask me how - I've never tried such a thing), but if you need to do that I wonder why you don't have access to the source in the first place...
You can't get the source from an IPA file. It's an executable. See Stack Overflow question Is it possible to reverse-engineer my iPhone application?.
Xcode compiles apps from Objective C to machine code, then they are packaged with all the other resources (images, nibs) into an IPA file. So you can't get it back to source code, only machine code.
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