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iOS设计模式 - 外观
原理图
说明
1. 当客服端需要使用一个复杂的子系统(子系统之间关系错综复杂),但又不想和他们扯上关系时,我们需要单独的写出一个类来与子系统交互,隔离客户端与子系统之间的联系,客户端只与这个单独写出来的类交互
2. 外观模式实质为为系统中的一组接口提供一个统一的接口,外观定义了一个高层接口,让子系统易于使用
源码
https://github.com/YouXianMing/FacadePattern
// // ShapeMaker.h // FacadePattern // // Created by YouXianMing on 15/7/28. // Copyright (c) 2015年 YouXianMing. All rights reserved. // #import <Foundation/Foundation.h> #import "Shape.h" #import "Circle.h" #import "Rectangle.h" #import "Square.h" @interface ShapeMaker : NSObject + (void)drawCircleAndRectangle; + (void)drawCircleAndSquare; + (void)drawAll; @end
// // ShapeMaker.m // FacadePattern // // Created by YouXianMing on 15/7/28. // Copyright (c) 2015年 YouXianMing. All rights reserved. // #import "ShapeMaker.h" @implementation ShapeMaker + (void)drawCircleAndRectangle { Shape *circle = [Circle new]; Shape *rectangle = [Rectangle new]; [circle draw]; [rectangle draw]; NSLog(@"\n"); } + (void)drawCircleAndSquare { Shape *circle = [Circle new]; Shape *square = [Square new]; [circle draw]; [square draw]; NSLog(@"\n"); } + (void)drawAll { Shape *circle = [Circle new]; Shape *rectangle = [Rectangle new]; Shape *square = [Square new]; [circle draw]; [rectangle draw]; [square draw]; NSLog(@"\n"); } @end
// // Shape.h // FacadePattern // // Created by YouXianMing on 15/7/28. // Copyright (c) 2015年 YouXianMing. All rights reserved. // #import <Foundation/Foundation.h> @interface Shape : NSObject /** * 绘制 */ - (void)draw; @end
// // Shape.m // FacadePattern // // Created by YouXianMing on 15/7/28. // Copyright (c) 2015年 YouXianMing. All rights reserved. // #import "Shape.h" @implementation Shape - (void)draw { // 由子类重写 } @end
分析
详细对比示意图
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原文地址：http://www.cnblogs.com/YouXianMing/p/4684233.html
