Big talk design model: simple factory model; big talk design model factory

Big talk design model: simple factory model; big talk design model factory

Chapter 1: code error-free Optimization-simple factory Mode

Create a computing class Operation first

Operation. h file

@interface Operation : NSObject@property(nonatomic,assign)double numberA;@property(nonatomic,assign)double numberB;@end

 

Operation. m file

@implementation Operation @end

 

Create their subclass Add, Sub, Mul, and Div respectively.

Add. h

#import "Operation.h" @interface Add : Operation-(double)OperationAdd;@end

 

 

Add. m

#import "Add.h" @implementation Add-(double)OperationAdd{    return self.numberA+self.numberB;}
@end

Sub. h

#import "Operation.h"@interface Sub : Operation-(double)operaSub;@end

Sub. m

#import "Sub.h"@implementation Sub- (double)operaSub{      return self.numberA-self.numberB;}@end

Mul. h

#import "Operation.h"@interface Mul : Operation-(double)OperaMul;@end

Mul. m

#import "Mul.h"@implementation Mul-(double)OperaMul{    return self.numberA*self.numberB;}@end

Div. h

#import "Operation.h"@interface Div : Operation-(double)OperaDiv;@end

Div. m

# Import "Div. h "@ implementation Div-(double) OperaDiv {// double result = 0.0; if (self. numberB = 0) {NSLog (@ "the divisor cannot be 0");} return self. numberA/self. numberB;} @ end

Computing factory class OperationFactory. h

#import <Foundation/Foundation.h>#import "Add.h"#import "Sub.h"#import "Mul.h"#import "Div.h"#import "Operation.h"@interface OperationFactory : NSObject@property(nonatomic,strong)Add *add;@property(nonatomic,strong)Sub *sub;@property(nonatomic,strong)Mul *mul;@property(nonatomic,strong)Div *div;-(double)createOperate:(char)opreate;@end

OperationFactory. m

#import "OperationFactory.h"@implementation OperationFactory-(double)createOperate:(char)opreate{     double result = 0.0;       switch (opreate) {        case '+':         result= self.add.OperationAdd;                         break;        case '-':               result=self.sub.operaSub;            break;                    case '*':               result=self.mul.OperaMul;               break;                    case '/':               result=self.div.OperaDiv;            break;    }    return result;}@end

Main Function

#import <Foundation/Foundation.h>#import "OperationFactory.h"int main(int argc, const char * argv[]) {    @autoreleasepool {        double result;        OperationFactory *factory=[[OperationFactory alloc]init];        Add *ad=[Add new];        ad.numberA=10;        ad.numberB=6;        factory.add=ad;          //        Div *di=[Div new];//        di.numberA=21;//        di.numberB=0;//        factory.div=di;////        result =[factory createOperate:'/'];                result=[factory createOperate:'+'];                NSLog(@"%lf",result);    }        return 0;}