So I am new to Xcode and Macs and I seem to be getting a lot of errors after trying to add a new framework. I needed the NSMatrix class and it was not included in the default frameworks (Foundation, CoreGraphics, UIKit, XCTest were. So I added the AppKit framework using Project Navigator>General>Linked Frameworks and Libraries. After I added that and #imported Appkit/AppKit.h in the .h that needed the NSMatrix class the errors for NSMatrix went away and it turned blue. Indicating that it found it I assume.
After that I tried compiling the project and got these errors:
http://i1346.photobucket.com/albums/p694/parkertmorris/ScreenShot2014-04-07at42152PM_zps3a1fdfdd.png
I tried removing the AppKit framework and the reference to it and compiling but I still get these errors. I also tried cleaning the project and deleting the DerivedData folder but nothing is changing.
Any ideas how I can fix this? Tried to research this problem for at least an hour.
Thanks
You and I are both new users (although I am a long time reader) to SO, and as such I'll try my best to help :)
I noticed you tagged this under "iOS". AppKit and NSMatrix are OS X specific, not for iOS, and you may want to remove the iOS tag as such and tag the question appropriately.
When problems like this happen to me in XCode, which occur less frequently with experience but still at annoying intervals, I tend to step backwards using Git (or whatever SCM you like) to a point where things are the least messed up. Based on the fact that your compiler errors are still occurring without AppKit/NSMatrix references, your problem likely exists independent of the framework, or at least alongside the framework.
Try opening your project.pbxproj file inside your project package and looking for duplicate entries of .h files under the same groupings. These types of problems sometimes bite me when rebasing/merging in Git and 90% of the time I can fix them with a very simple change to my project.pbxproj file. Even better, try diffing your previously working .pbxproj with it's current state and see what's going on.
