Execute a method when a variable value changes in Swift

Question

I need to execute a function when a variable value changes.

I have a singleton class containing a shared variable called labelChange. Values of this va

Answer 1

var item = "initial value" {
    didSet { //called when item changes
        print("changed")
    }
    willSet {
        print("about to change")
    }
}
item = "p"