iOS設計模式－生成器

定義：將一個產品的內部表象與產品的生成過程分割開來，從而可以使一個建造過程生成具有不同的內部表象的產品對象。

類型：對象創建

類圖：

#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

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