Factory Pattern for Swift

FactoryPattern : Part 1 - Circle.swift

import Foundation
class Circle : Shape{
    func draw() {
        print("Inside \(self.dynamicType)::draw() method.")
    }
}

FactoryPattern : Part 2 - Rectangle.swift

import Foundation
class Rectangle: Shape {
    func draw() {
        print("Inside \(self.dynamicType)::draw() method.")
    }
}

FactoryPattern : Part 3 - Shape.swift

import Foundation

protocol Shape{
    func draw()
}

FactoryPattern : Part 4 - Square.swift

import Foundation
class Square: Shape{
    func draw() {
        print("Inside \(self.dynamicType)::draw() method.")
    }
}

FactoryPattern : Part 5 - ShapeFactory.swift

import Foundation
class ShapeFactory : NSObject{
    func getShape(shapeType: String) ->Shape? {
        if (shapeType == ""){
            return nil
        }
        else if (shapeType == "Circle"){
            return Circle()
        }
        else if (shapeType == "Rectangle"){
            return Rectangle()
        }
        else if (shapeType == "Square"){
            return Square()
        }
        return nil
    }
    
}

FactoryPattern : Part 6 - FactoryPattern.swift

let shapeFactory : ShapeFactory = ShapeFactory()

let shape1 = shapeFactory.getShape("Circle")
shape1?.draw()

let shape2 = shapeFactory.getShape("Rectangle")
shape2?.draw()

let shape3 = shapeFactory.getShape("Square")
shape3?.draw()