UIButton action generates a SIGABRT but no breakpoint triggers - swift

Question

I have this code to create a button on my storyboard
override func viewDidLoad() {
super.viewDidLoad()
...
signupButton.addTarget(self, action: "pressed:", forControlEvents: .TouchUpInside)
...
}
func pressed(sender:UIButton!) {
println("Pressed")
}
However, it throws a SIGABRT error when I press the button. So, I added a breakpoint on all exceptions. However, no breakpoint was ever it - it just threw the exception. How do I find out what's causing the error?

Answer 1

You have two issues here...
First: You placed the pressed function in the scope of viewDidLoad, when it needs to be outside of that function and in the scope of the class. Move the function pressed out of viewDidLoad().
Second: This is not what is causein the signal abort crash, but it is needed nonetheless. Add a semicolon to the action selector name.
signupButton.addTarget(self, action: "pressed:", forControlEvents: .TouchUpInside)
Or, if you don't need to pass any object to the function pressed, then change the function header to func pressed().
BASIC EXAMPLE: (tested and working in new project)
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let signupButton = UIButton(frame: CGRectMake(0, 0, 100.0, 100.0))
signupButton.setTitle("BUTTON", forState: UIControlState.Normal)
signupButton.addTarget(self, action: "pressed:", forControlEvents: .TouchUpInside)
self.view.addSubview(signupButton)
}
func pressed(sender:UIButton!) {
println("Button pressed")
}
}