iOS设计模式－生成器

定义：将一个产品的内部表象与产品的生成过程分割开来，从而可以使一个建造过程生成具有不同的内部表象的产品对象。

类型：对象创建

类图：

#import <Foundation/Foundation.h>

@interface Character : NSObject
@property(nonatomic, assign)float protection;
@property(nonatomic, assign)float power;
@property(nonatomic, assign)float strength;
@property(nonatomic, assign)float stamina;
@property(nonatomic, assign)float intelligence;
@property(nonatomic, assign)float agility;
@property(nonatomic, assign)float aggressiveness;
@end

#import "Character.h"

@implementation Character

- (instancetype)init{
    if (self = [super init]) {
        _protection = 1.0;
        _power = 1.0;
        _strength = 1.0;
        _stamina = 1.0;
        _intelligence = 1.0;
        _agility = 1.0;
        _aggressiveness = 1.0;
        
    }
    return self;
}

@end

#import <Foundation/Foundation.h>
#import "Character.h"

@interface CharacterBuilder : NSObject{
   Character * _character;
}
@property(nonatomic, readonly)Character *character;

- (CharacterBuilder *)buildNewCharacter;
- (CharacterBuilder *)builStrength:(float)value;
@end

#import "CharacterBuilder.h"

@implementation CharacterBuilder

- (CharacterBuilder *)buildNewCharacter{
    _character = [[Character alloc]init];
    return self;
}
- (CharacterBuilder *)builStrength:(float)value{
    _character.strength = value;
    return self;
}

@end

#import "CharacterBuilder.h"

@interface StandardCharacterBuilder : CharacterBuilder

@end

#import "StandardCharacterBuilder.h"

@implementation StandardCharacterBuilder

- (CharacterBuilder *)builStrength:(float)value{
    _character.protection = value;
    _character.power = value;
    return [super builStrength:value];
}

@end

#import <Foundation/Foundation.h>
#import "StandardCharacterBuilder.h"

@interface ChasingGame : NSObject

- (Character *)createPlayer:(CharacterBuilder *)builder;
- (Character *)createEnemy:(CharacterBuilder *)builder;

@end

#import "ChasingGame.h"

@implementation ChasingGame

- (Character *)createPlayer:(CharacterBuilder *)builder{
    [builder buildNewCharacter];
    [builder builStrength:50.0];
    return [builder character];
}

- (Character *)createEnemy:(CharacterBuilder *)builder{
    [builder buildNewCharacter];
    [builder builStrength:80.0];
    return [builder character];
}

@end