3.AbstactFactory - QDDCoder/LZLearniOS GitHub Wiki

抽象工厂模式

 抽象工厂模式（Abstract Factory Pattern）是围绕一个超级工厂创建其他工厂。该超级工厂又称为其他工厂的工厂。这种类型的设计模式属于创建型模式，它提供了一种创建对象的最佳方式。

 在抽象工厂模式中，接口是负责创建一个相关对象的工厂，不需要显式指定它们的类。每个生成的工厂都能按照工厂模式提供对象。

代生产的对象抽象接口/对象

/// 抽象工厂待生产的shape接口
protocol Shape {
    func draw()
}
/// 抽象工厂待生产的Color接口
protocol Color {
    func fill()
}

//抽象工厂待生产的对象
class Rectangle: Shape {
    func draw() {
        print("开始Rectangle的绘画")
    }
}

class Square: NSObject, Shape {
    func draw() {
        print("开始Square的绘画")
    }
}

class Red: Color {
    func fill() {
        print("开始Red的fill")
    }
}

class Yellow: Color {
    func fill() {
        print("开始Yellow的fill")
    }
}

抽象工厂类

/// 抽象工厂类
protocol AbstractFactoryModel {
    func getColor(withColor color:String) -> Color?
    func getShape(withShape shape:String) -> Shape?
}

抽象工厂生产的工厂

/// Shape的工厂
class ShapeFactory: AbstractFactoryModel {
    func getColor(withColor color: String) -> Color? {
        return nil
    }
    
    func getShape(withShape shape: String) -> Shape? {
        if shape == "Rectangle"{
            return Rectangle()
        }else if shape == "Square"{
            return Square()
        }
        return nil
    }
}

/// Color的工厂
class ColorFactory: AbstractFactoryModel {
    func getColor(withColor color: String) -> Color? {
        if color == "Red"{
            return Red()
        }else if color == "Yellow"{
            return Yellow()
        }
        return nil
    }
    
    func getShape(withShape shape: String) -> Shape? {
        return nil
    }
}

工厂的生产

/// 工厂生产类 通过颜色或者形状获取工厂
class FactoryProducer: NSObject {
    /// 单例
    static func getFactory(withChoice choice:String) -> AbstractFactoryModel? {
        if choice == "Shape" {
            return ShapeFactory()
        }else if choice == "Color"{
            return ColorFactory()
        }
        return nil
    }
}

  • 抽象工厂测试类

/// 获取形状工厂
let shapeFactory = FactoryProducer.getFactory(withChoice: "Shape")
//获取形状为Square的对象
if let shape1 = shapeFactory?.getShape(withShape: "Square") {
    shape1.draw()
}

//获取形状为Rectangle
if let shape2 = shapeFactory?.getShape(withShape: "Rectangle") {
    shape2.draw()
}

//获取颜色工厂
let colorFactory = FactoryProducer.getFactory(withChoice: "Color")
//获取red对象
if let color1 = colorFactory?.getColor(withColor: "Red") {
    color1.fill()
}
//获取yellow对象
if let color2 = colorFactory?.getColor(withColor: "Yellow") {
    color2.fill()
}

  • 测试结果

开始Square的绘画
开始Rectangle的绘画
开始Red的fill
开始Yellow的fill
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