gistfile1.txt

class MyClass {
    var myNumber: Int {
        willSet {
            println("Will set to \(newValue) in the super class")
        }
    }
    
    var myString: String
    
    init(myNumber: Int, myString: String) {
        self.myNumber = myNumber
        self.myString = myString
    }
}



class MySubClass: MyClass {
    
    override var myNumber: Int {
        willSet {
            println("Will set to \(newValue) in the subclass")
        }
    }
    
    override var myString: String {
        willSet {
            println("Will set myString to \(newValue) in the subclass")
        }
    }
}


let thing = MySubClass(myNumber: 1, myString: "Hello")
thing.myNumber = 2
thing.myString = "Goodbye"

/*
Outputs

Will set to 2 in the subclass
Will set to 2 in the super class
Will set myString to Goodbye in the subclass

*/