How to link a boolean value to the on/off state of a UISwitch?

Question

I have a UISwitch that I want to control a boolean value in a function I wrote. I looked in the UISwitch Type Reference and it listed the property

Answer 1

Succinctness, even parsimony, is important in coding style. Try this:

@IBAction func switchValueChanged (sender: UISwitch) {
  advice.isInProduction = sender.on
  print ("It's \(advice.isInProduction)!")
}

In your original code, you likely crashed because acsessabilitySwitch or advice are unbound (have values of nil).

[Updated - replaced println with print]