xcode won't compile iOS apps, crashes when .xib or .storyboard files are opened

Question

I\'m running the very latest version of xcode (4.2.1). And I\'m signed up to the ios developer program.

When I create a new iOS Application for iPhone or iPad, using

Answer 1

did you installed TotalFinder?

I had the same problem caused by TotalFinder's Asepsis feature.

Asepsis current Version (1.1) Conflicts with Xcode 4.2 and Glims (see image).

The Website lists this known issue:

Xcode 4.2, iOS 5.0 Simulator

Some developers reported that Asepsis breaks iOS 5.0 Simulator and causes Xcode 4.2 fail in loading XIB files

to uninstall just run this command from Terminal:

sudo open /System/Library/Extensions/Asepsis.kext/Contents/Resources/Asepsis\ Uninstaller.app

Answer 2

Try removing (you can try just moving them rather than deleting them) these user directories. Make sure your developer tools are not running when you do this.

~/Library/Application\ Support/iPhone\ Simulator
~/Library/Application\ Support/Developer
~/Library/Developer

These directories are particular to your user.

Answer 3

I hate to say it, but it sounds like you may need to do a clean system install followed by a clean XCode install.

Or do you have another machine you can try a clean install of XCode on first?

If you can't just create a new project and run it in the simulator without it crashing you either have an issue with XCode or with your system. Since reinstalling XCode you still have an issue, I am afraid that leaves your system in question.

Answer 4

I have same problem within xcode4.5 and iOS6. When I startup iOS simulator 6, it always report "The simulated application quit" and ask me to switch SDKS. Whatever I choose the right location of SDK5.0 or SDK6.0 for the simulator, the problem is still here. So I can't run even a simplest program with SDK6.0, but the old projects with SDK5.0 are ok.

I don't why, because it works well before today. So I follow @quellish's way, close xcode and simulator, remove these directory in my finder: ~/Library/Application\ Support/iPhone\ Simulator ~/Library/Application\ Support/Developer ~/Library/Developer

Then run Xcode again, everything goes ok again! thanks quellish!

I think some files in these directory was broken, so the strange problem happened. If someone know exactly why it happened, it's appreciate you can tell me.

Answer 5

I had this same problem and deleting everything in your "Derived Data" folder fixed my issues. In your case: /Users/mark/Library/Developer/Xcode/DerivedData/EmptyViewTest

Maybe this thread will help: How can I safely delete in my ~/Library/Developer/Xcode/DerivedData directory?

Answer 6

It's a pretty fundamental problem and so unlikely it's anything you're doing wrong. I'd suggest reinstalling Xcode. If that doesn't work, try uninstalling it first and install it again. (Bit of a pain, sorry. Stock up on coffee first.)