大话设计模式之策略模式

@interface CashSuper : NSObject
-(double)acceptCash:(double)money;
@end

@implementation CashSuper

-(double)acceptCash:(double)money{

    return money;

}

@end

#import <Foundation/Foundation.h>
#import "CashSuper.h"
@interface CashNormal : CashSuper

@end

#import "CashNormal.h"

@implementation CashNormal
-(double)acceptCash:(double)money{

    return money;
}
@end

#import <Foundation/Foundation.h>
#import "CashSuper.h"
@interface CashRebate : CashSuper
@property(assign,nonatomic)double Rebate;
-(instancetype)initWithRebate:(double) Rebate;
@end

#import "CashRebate.h"

@implementation CashRebate
- (instancetype)initWithRebate:(double)Rebate{
    self = [super init];
    if (self) {
        _Rebate=Rebate;
    }
    return self;
}
-(double)acceptCash:(double)money{

    return money*_Rebate;
}
@end

#import <Foundation/Foundation.h>
#import "CashSuper.h"
@interface CashReturn : CashSuper
@property(assign,nonatomic)double moneyCondition;
@property(assign,nonatomic)double moneyReturn;
-(instancetype)initWithMoneyCondition:(double)moneyCondition :(double)moneyReturn;
@end

#import "CashReturn.h"

@implementation CashReturn
-(instancetype)initWithMoneyCondition:(double)moneyCondition :(double)moneyReturn
{
    self = [super init];
    if (self) {
        _moneyCondition=moneyCondition;
        _moneyReturn=moneyReturn;
    }
    return self;
}
-(double)acceptCash:(double)money{
    double result=money;
    if (money>=_moneyCondition) {
        result=money-((int)(money/_moneyCondition))*_moneyReturn;
    }
    return result;
}
@end

#import <Foundation/Foundation.h>
#import "CashSuper.h"
@interface CashContext : NSObject
@property(nonatomic,strong)CashSuper *cashsuper;
-(instancetype)initWith:(CashSuper *)csuper;
-(double)GetResult:(double)money;
@end

#import "CashContext.h"

@implementation CashContext
- (instancetype)initWith:(CashSuper *)csuper
{
    self = [super init];
    if (self) {
        _cashsuper=csuper;
    }
    return self;
}
-(double)GetResult:(double)money{
   return  [_cashsuper acceptCash:money];

}
@end

#import <Foundation/Foundation.h>
#import "CashContext.h"
#import "CashSuper.h"
#import "CashNormal.h"
#import "CashRebate.h"
#import "CashReturn.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        char type=‘B‘;
        double result=0.0;
        CashContext *cc=nil;
      
        switch (type) {
            case ‘N‘:
              
                cc=[[CashContext alloc]initWith:[[CashNormal alloc]init]];
                break;
            case ‘B‘:
                
                cc=[[CashContext alloc]initWith:[[CashRebate alloc]initWithRebate:0.7]];
                break;
            case ‘T‘:
                cc=[[CashContext alloc]initWith:[[CashReturn alloc] initWithMoneyCondition:300 :100]];
                break;
        }
        result = [cc GetResult:500];
        NSLog(@"%f",result);
    }
    return 0;
}