How do I solve a 'NSUnknownKeyException' … setValue:forUndefinedKey:]: …not key value coding compliant [duplicate]

Answer 1

Look in your storyboard or xib (whichever you're using) for the ViewControllerWelcome object. The most likely source of this error is that something has a connection to an action or outlet called done that doesn't exist in the code for that class.

Answer 2

For my situation I added -all_load in "Other Linker Flags" to prevent Xcode from stripping my library binary code.

Answer 3

If you are using a storyboard then just click on every ViewController and select the connections inspector of them. Check whether there exit any exclamatory sign(for lost connections).

Delete them properly.Then run your project again.

Answer 4

The easiest way to check that is to Ctrl+Click on your Controller in the Storyboard View and look for something in the resulting popup which has a yellow warning mark next to it. Simply delete it by pressing the (x) next to the Outlet name.

Answer 5

In my case it was some weird cache on xcode, even with all the removed references to the IBOutlets was still making it crash. IBOutlets were pointing to a older version of my file so not even removing and adding back files or removing all referencing outlets from my nib worked...

SOLUTION: closing xcode made the trick, also cleaning/deepCleaning the project might have helped.

Answer 6

I have encountered the same problem, I used a xib for the viewcontroller but then I deleted it. However in the code,the connection still get connections from the deleted xib. So the way to walk around is create a new xib for the viewcontroller. Then problem solved.