1.生成器模式的定义
将一个复杂的对象的构件与它的表示分离，使得同样的构建过程可以创建不同的表示
2.生成器模式的UML
Paste_Image.png
Builder ：生成器接口，定义创建一个Product各个部件的操作
ConcreteBuilder：具体的生成器的实现类
Product：产品，表示被生成器构建的复杂的对象，包含多个部件
Director：指导者也称导向者，主要用来使用Builder接口 ，已一个统一的接口创建Product对象
比如我们要生产一辆汽车, 简单分为生产发动机, 轮子, 车门, 分别由发动机部门, 轮子部门, 车门部门分别负责生产
由生产调度中心调度, 并将3个部门的产品合成为一辆汽车
首先我们创建一个生产调度中心Build类负责调度其他生产部门, 这个时候需要给生产部门一个约束或者是协议, 比如部门要有统一的生产方法
然后我们以接口的形式创建各个部门的抽象接口
AbstractEngineProtocol.h
#import <Foundation/Foundation.h>
#import <UIKit/UIkit.h>
@protocol AbstractEngineProtocol <NSObject>
@required
/**
设置发动机尺寸
@param scale 尺寸大小
*/
- (void)engineScale:(CGFloat)scale;
/**
设置发动机重量
@param height 发动机重量
*/
- (void)engineWeight:(CGFloat)height;
/**
获取发动机信息
@return 返回发动机信息
*/
- (NSString *)information;
@end
AbstractWheelProtocol.h
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@protocol AbstractWheelProtocol <NSObject>
@required
/**
设置轮子个数
@param number 个数
*/
- (void)wheelNumber:(CGFloat)number;
/**
返回轮子信息
@return 轮子信息
*/
- (NSString *)information;
@end
AbstractDoorProtocol.h
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@protocol AbstractDoorProtocol <NSObject>
@required
/**
设置门的数量
@param number 数量
*/
- (void)doorNumber:(CGFloat)number;
/**
返回车门的信息
@return 车门信息
*/
- (NSString *)information;
@end
BuildProtocal.h
#import <Foundation/Foundation.h>
@protocol BuildProtocal <NSObject>
@required
/**
生产部件
@return 返回部件
*/
- (id)build;
@end
Builder.h
#import <Foundation/Foundation.h>
#import "AbstractDoorProtocol.h"
#import "AbstractWheelProtocol.h"
#import "AbstractEngineProtocol.h"
#import "BuildProtocal.h"
@interface Builder : NSObject
@property (nonatomic, strong) id <BuildProtocal, AbstractEngineProtocol> engine;
@property (nonatomic, strong) id <BuildProtocal, AbstractWheelProtocol> wheel;
@property (nonatomic, strong) id <BuildProtocal, AbstractDoorProtocol> door;
/**
产品信息
*/
@property (nonatomic, strong) NSDictionary *productInfo;
/**
构建所有部件
@return 返回产品
*/
- (id)buildAllParts;
@end
Builder.m
#import "Builder.h"
@implementation Builder
- (id)buildAllParts {
//创建部件
[self.engine build];
[self.wheel build];
[self.door build];
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
//组装产品
dict[@"engine"] = [self.engine information];
dict[@"wheel"] = [self.wheel information];
dict[@"door"] = [self.door information];
self.productInfo = dict;
return self;
}
@end
接下来我们创建各个部门的类, 他们实现部门抽象接口的同时还要遵循调度中心的约束, 实现调度中心的接口
BMWEngine.h
#import <Foundation/Foundation.h>
#import "AbstractEngineProtocol.h"
#import "BuildProtocal.h"
@interface BMWEngine : NSObject <AbstractEngineProtocol, BuildProtocal>
@end
BMWEngine.m
#import "BMWEngine.h"
@implementation BMWEngine
#pragma mark - AbstractEngineProtocol methods
- (void)engineScale:(CGFloat)scale {
//to do
}
- (void)engineWeight:(CGFloat)height {
//to do
}
- (NSString *)information {
return @"BMW Engine, Scale: 10, Height: 100kg";
}
#pragma mark - BuildProtocol method
- (id)build {
return [BMWEngine new];
}
@end
MIQIWheel.h
#import <Foundation/Foundation.h>
#import "BuildProtocal.h"
#import "AbstractWheelProtocol.h"
@interface MIQIWheel : NSObject <BuildProtocal, AbstractWheelProtocol>
@end
MIQIWheel.m
#import "MIQIWheel.h"
@implementation MIQIWheel
#pragma mark - AbstractWheelProtocol methods
- (void)wheelNumber:(CGFloat)number {
//to do
}
- (NSString *)information {
return @"MIQI Wheel, number: 4";
}
#pragma mark - BuildProtocol method
- (id)build {
return [MIQIWheel new];
}
@end
BMWDoor.h
#import <Foundation/Foundation.h>
#import "BuildProtocal.h"
#import "AbstractDoorProtocol.h"
@interface BMWDoor : NSObject <BuildProtocal, AbstractDoorProtocol>
@end
BMWDoor.m
#import "BMWDoor.h"
@implementation BMWDoor
#pragma mark - AbstractDoorProtocol methods
- (void)doorNumber:(CGFloat)number {
//to do
}
- (NSString *)information {
return @"BMW Door, number: 4";
}
#pragma mark - BuildProtocol method
- (id)build {
return [BMWDoor new];
}
@end
下面是在Controller中实现
#import "ViewController.h"
#import "Builder.h"
#import "BMWEngine.h"
#import "BMWDoor.h"
#import "MIQIWheel.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//创建一个建造调控中心
Builder *builder = [[Builder alloc] init];
//配置生产组件单位
builder.engine = [[BMWEngine alloc] init];
builder.wheel = [[MIQIWheel alloc] init];
builder.door = [[BMWDoor alloc] init];
//生产
id product = [builder buildAllParts];
//打印产品信息
NSLog(@"%@", [product productInfo]);
}
@end
