Use function from one class in another class in Swift

Question

So lets say I have a class called Math

class Math{

    func add(numberOne: Int, numberTwo: Int) -> Int{

        var answer: Int = numberOne + numberTwo
        return answer
    }

In this class there is a function which allows the user to add two numbers.

I now have another class which is a subclass of a UIViewController and I want to use the add function from the Math class, how do I do this?

class myViewController: UIViewController{

    //Math.add()???

}

Answer 1

If you want to be able to say Math.add(...), you'll want to use a class method - just add class before func:

class Math{

    class func add(numberOne: Int, numberTwo: Int) -> Int{

        var answer: Int = numberOne + numberTwo
        return answer
    }
}

Then you can call it from another Swift class like this:

Math.add(40, numberTwo: 2)

To assign it to a variable i:

let i = Math.add(40, numberTwo: 2) // -> 42