High speed getter without getter

Question

How do you implement a setter without getter in Swift? I need to call the method when the value is set:

var selectedIndex : Int{
set{
    selectItemAtIndex(newValue)
}
}

but in Swift you need to use both getter and setter, not just one.

Answer 1

You can use the observer property didSet. This will be called immediately after setting the value.

var selectedIndex: Int {
  didSet {
    selectItemAtIndex(selectedIndex)
  }
}