“Unrecognized selector sent to instance” in swift

Question

I have no idea what I am doing wrong. I am also quite new to programming so I am not very good at debugging. This was a test app so that I can see how swift ties in with app

Answer 1

Adding an @IBAction function to your code and then deleting or renaming it without updating your storyboard will also cause this error.

Look at the selector in the error message:

'-[HelloWorld.ViewController yourActionFunction:]: unrecognized selector sent to instance 0x157e0c830'
                             ^^^^^^^^^^^^^^^^^^

Do you have a function named yourActionFunction? If not, select the storyboard and edit the connections on your control (e.g. button).