Abstract Factory mode

A simple factory is an entity class that contains methods to create objects directly from different parameters. Abstract Factory pattern is a further abstraction (such as a UML diagram) of the plant class on the basis of a simple factory:

　　

In the project, we created two entity classes: Animal (Animal) and Plant (Plant), which follow protocol animalprotocol and Plantprotocol, respectively, subclass Dog, Fish, Bird (inherited from Animal Class) and Rose, Sakura (inherited from the plant Class), the two entity classes are instantiated by the factory class Animalfactory and Plantfactory (all inherit from the Bioligyfactory factory Class), on this basis, the factory class is further abstracted, The factory class is instantiated through the abstract factory class Abstractfactory.

Code implementation:

1.Animal, Animalfactory, biologyfactory

Animal, Animalfactory code has been created in simple Factory mode, just inherit animafactory from Biologyfactory and change the class method to an instance method.

1 //BiologyFactory.h2 #import<Foundation/Foundation.h>3 #import "Plant.h"4 #import "Animal.h"5 6 typedef ns_enum (Nsinteger, efactory) {7 Kanimalfactory,8 Kplantfactory,9 };Ten  One typedef ns_enum (Nsinteger, eplanttype) { A Krose, - Ksakura, - }; the  -typedefenum { - Kdog, - Kbird, + Kfish, - }eanimaltype; +  A @interfaceBiologyfactory:nsobject at  --(plant*) Createplantwithtype: (eplanttype) type; -  --(animal*) Createanimalwithtype: (eanimaltype) type; -  - @end

2.Plant, Plantfactory

1 //Plant.h2 #import<Foundation/Foundation.h>3 4 @protocolPlantprotocol <NSObject>5 @optional6- (void) Flower;7- (void) color;8 @end9 Ten @interfacePlant:nsobject<plantprotocol> One  A @end -  - //Rose.h the #import "Plant.h" -  - @interfacerose:plant -  +- (void) Thorn; -  + @end A  at //Sakura.h - #import "Plant.h" -  - @interfacesakura:plant -  -- (void) Enjoyflower; in  - @end

1 //PlantFactory.h2 #import "BiologyFactory.h"3 #import "Rose.h"4 #import "Sakura.h"5 6 @interfaceplantfactory:biologyfactory7 8-(plant*) Createplantwithtype: (eplanttype) type;9 Ten @end One  A //plantfactory.m - #import "PlantFactory.h" -  the @implementationplantfactory -  --(Plant *) Createplantwithtype: (eplanttype) type{ -Plant *plant =Nil; +     if(Type = =krose) { -Plant = [RoseNew]; +}Else if(Type = =Ksakura) { APlant = [SakuraNew]; at     } -     returnplant; - } -  - @end

3.AbstractFactory creation

1 //AbstractFactory.h2 #import<Foundation/Foundation.h>3 #import "BiologyFactory.h"4 #import "AnimalFactory.h"5 #import "PlantFactory.h"6 7 @interfaceAbstractfactory:nsobject8 9+ (biologyfactory*) Createfactorywithtype: (efactory) type;Ten  One @end A  - //abstractfactory.m - #import "AbstractFactory.h" the  - @implementationabstractfactory -  -+ (biologyfactory*) Createfactorywithtype: (efactory) type{ +Biologyfactory *factory =Nil; -     if(Type = =kanimalfactory) { +Factory = [AnimalfactoryNew]; A}Else if(Type = =kplantfactory) { atFactory = [PlantfactoryNew]; -     } -     returnFactory; - } -  - @end

Abstract Factory mode