Unwind seg programmatically in Xcode6 and Swift

Question

In destination screen, I put this:

@IBAction func unwindToLogin (segue : UIStoryboardSegue) {}

From storyboard view button for example, I can easily refer to this to unwind.

But I cannot do it programmatically. I tried to trigger this in current screen:

 performSegueWithIdentifier("unwindToLogin", sender: nil)

but it crashes because of nil. So it seems from storyboard "exit" I can 'catch' the unwind and link it to a button, but I can't do this programmatically.

Answer 1

Use Selector s:

Selector("unwindToLogin:")

By the way, Selector s should be automatically created from string s, so I think the problem is with the missing semicolon, but I haven't my Mac with me atm.

Answer 2

The name of the function you put in the destination view controller is not the identifier of the segue. You need to set the identifier in the storyboard, and use that string in performSegueWithIdentifier.