Singleton Design Pattern in Swift

swift_design_patterns_singleton.swift

// Singleton Design Pattern Example
// Author: Jean-Marc Boullianne

class Singleton {

    static let instance = Singleton()

    private init() {
        // Initialize class variable here
    }

    func shared() -> Singleton {
        return instance
    }

}

// Example for getting an instance of the class in code...
// ....
var singletonInstance = Singleton.shared()