iOS 之设计模式demo

iOS 之设计模式

一个咖啡店卖好几种咖啡:摩卡,布列夫,拿铁等等 咖啡有很多搭配:方糖,鲜牛奶,奶油,盐等. 试设计计算出咖啡(+搭配)的单价模型.

虚基类 Coffee

这个类包含什么呢 { . 咖啡的单价(不含 方糖 奶等 调味料) -->price . 一个存放调味料的容器 -->ecoratorRelishChain . 一个可以得到总价的方法 --> getTotalPrices }

咖啡类都继承自该类：

h文件

//abstract 咖啡基类
 @class DecoratorChain;

 @interface  Coffee: NSObject
 @property ( nonatomic,strong ) DecoratorChain *ecoratorRelishChain;//用来存储 奶 方糖 等等的调料 可以把它想象成一个调味盒 
 @property ( nonatomic,strong ) NSDecimalNumber *price;//单价 不含配料
 -(NSDecimalNumber *) getTotalPrices;//得到总价
 @end

m 文件

@interface Coffee()
@property(nonatomic,strong) NSString * _coffeeName;
@end

@implementation Coffee

- (id)init
{
    self = [super init];
    if (self) {
        _coffeeName=@"咖啡名称";
        price = [[NSDecimalNumber alloc] initWithString:@"20"];
    }
    return self;
}

-(NSDecimalNumber *)getTotalPrices
{

    return [self.price decimalNumberByAdding: [ecoratorRelishChain getCountPrice]];
}

@end

虚基类 ECoratorRelish

EcoratorRelish 是 方糖 奶油 牛奶 盐 等等的抽象类 这个继承在button 点击的时候 可以自动将自己加入到chain (调料盘中)

这个类包含什么呢 { . 自身的单价 -->price . 可以修改价钱的策略 --> configPrivilege }

h 文件

@interface  EcoratorRelish: UIButton
@property(nonatomic,strong)  NSDecimalNumber *price;//单价 
//Overload
-(void)configPrivilege;//可以配置优惠策略
-(DecoratorChain *)getComponentCoffee;
@end

m 文件

@implementation  EcoratorRelish
@synthesize  price;

- (id)init
{
    self = [super init];
    if (self) {
        [self addTarget:self action:@selector(addDecoratorChain) forControlEvents:UIControlEventTouchUpInside];
    }
    return self;
}
//Overload
-(void)configPrivilege
{
    //可以配置优惠策略 
}
//获取当前的辅料坐在的ViewController
- (UIViewController *)getViewController {
    Class vcc = [UIViewController class];
    UIResponder *responder = self;
    while ((responder = [responder nextResponder]))
        if ([responder isKindOfClass: vcc])
            return (UIViewController *)responder;
    return nil;
}

//获取要装饰的咖啡的调味盒(chain)
-(DecoratorChain *)getEcoratorRelishChain
{
   return  [self getViewController].coffee.ecoratorRelishChain;
}

//将自己加到咖啡的调味盒(chain)
-(void)addDecoratorChain
{
    [[self getEcoratorRelishChain] addDecoratorRelish:self];
}

@end

调料盒DecoratorChain

h 文件

//用于保存配料的chain
@interface  DecoratorChain: NSMutableArray
-(void)addDecoratorRelish:(EcoratorRelish*)ecoratorRelish;
@end

m文件

@interface DecoratorChain()
@property(nonatomic,strong) NSDecimalNumber * _countPrice;
@end

@implementation DecoratorChain
@synthesize _countPrice;

- (id)init
{
    self = [super init];
    if (self) {
        _countPrice = [[NSDecimalNumber alloc]init];
    }
    return self;
}

-(void)addDecoratorRelish:(EcoratorRelish*)ecoratorRelish
{
    [self addObject:ecoratorRelish];
}

//得到当前所有chain 里面的总价
-(NSDecimalNumber*)getCountPrice
{
    for (EcoratorRelish *tmp  in self ) {
        [_countPrice decimalNumberByAdding:tmp.price];
    }
    return _countPrice;
}

@end