The crash is generally a sign the project file has been corrupted. Here's a list of possible things you can do to try to fix it.
1. Fix a corrupted *.pbxproj file
Caused by a merge conflict
If you are using version control, it might be caused by a merge conflict that has not yet been resolved.
- Using Finder, open the directory that holds your project.
- Right click the project file
YOUR_PROJECT_NAME.xcodeproj and Open With your preferred text editing tool such as Sublime Text.
- Look for merge conflicts which are usually marked using a series of
========= bars.
- Resolve the merge conflicts manually or remove the changes of one side.
Caused by unreadable XML
If that fails go into the file and quickly scroll through to see if anything seems out of place - it should generally be readable XML. You could even try an XML validator against it to see if anything amiss was found.
2. Reset your workspace
- Using Finder, open the directory that holds yor project.
- Right click the project file
MyProject.xcodeproj and choose Show Package Contents.
- Delete the
xcuserdata folder, which should contain a folder with your username on it.
- Repeats step 2 and 3 for your workspace file
MyProject.workspace
As elaborated by KennyWinker and Paul R on the answers below.
3. Recreate your Xcode project
Note that this should be your last resort as it is quite tedious to do for large projects.
Lastly you could simply re-create it. That might seem like a big pain, but basically you could just create a new project and drag everything under the "Classes" folder into Xcode to start using it (don't forget to also add the frameworks you need).
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