How to call functions in a separate Swift file

Update - May 22, 2017. The code below still works with Xcode 8.3.1 (Swift 3.1).

The code below shows how to call functions in a separate Swift file. Xcode 7.3 (Swift 2.2) is used. Two examples are shown in the following steps:

1. Create a new Swift file with any name such as MyFile.swift.

2. Modify the file as:

import Foundation

//Example 1

class MyClass {

    func myFun() {

        print("myFun!!")

    }

    static let myInstance = MyClass()

}

//Example 2

class AnotherClass {

    class func anotherFun() {

        print("anotherFun!!")

    }

}

3. Modify ViewController.swift as:

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {

        super.viewDidLoad()

        

        MyClass.myInstance.myFun()

        

        AnotherClass.anotherFun()

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

    }

}

Result of Debug Console:

myFun!!

anotherFun!!