Xcode 4.2 not ask to save changes

Why xcode 4.2 will not ask: "to save changes or not", for example when I delete \ altering anything in the StoryBoard and elsewhere? Wen I close xcode, it's just save any changes I did, but I do not want to do this. That's bad, I can do any modifications in my project and then just hit close button and it's will be saved without any warning messages, but if i do not want to save?

Llessur999 wrote:
KT is pointing you to the very first first preference, Xcode > Preferences > General > Auto-save.
No he isn't.  Those links just go the introductory pages, which say nothing about this.  As usual for him.
There is no preference for this in Xcode, which is probably WHY THIS GUY ASKED.
This situation is a lot worse than simply not asking to save a file.  Lion is deleting work.
Last night I typed a non-trivial paragraph of code into a source file.  And saved it.  I hit Command-S after every line of code, no exaggeration.  A few minutes later, I was scrolling up and down madly looking for it and couldn't find it.  In case I accidentally put it in the wrong file, I searched the whole project for a string I knew I'd used.  Nowhere to be found.
Suddenly Xcode presents a dialog complaining that it couldn't autosave the file because it had been modified externally.  Did I want to "revert", or save what was in the editor?
I've been seeing these dialogs on both my machines intermittently for weeks.  Same versions of everything on each system: OS, dev tools.  Same project.  Usually I opt to save what's in the editor, thinking that it must be the correct version.  Well now I know otherwise.  I hit "Revert", and the block of code magically reappeared on my screen.
No, there was nothing else running that could've deleted code.  At least, not anything visible.
But it occurred to me that this might be Lion file-management crap gone seriously and dangerously wrong.  And now that other people are reporting the same thing, it looks like that suspicion is being borne out.

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