ios - 尝试用 ViewController 做一个简单的分数虽然难倒

Question

我在 View 中的回答一直是 0/0。我不确定为什么它不更新？我敢肯定有人会快速查看并立即解决它。我是一个完全的初学者，所以我被难住了。

#import "Fraction.h"

@implementation Fraction
{
    #pragma mark --Step#3---What are the variables
    int numerator;
    int denominator;

}


-(void) setNumerator: (int) setNumerator
{
    #pragma mark --Step#8---Make sure the setter is on the right
    /*  I had these back to front before  */
     NSLog (@"setNumerator %d ", setNumerator);
    setNumerator = numerator;

}
-(void) setDenominator: (int) setDenominator
{
     NSLog (@"setDenominator %d ", setDenominator);
    setDenominator = denominator;

}
#pragma mark --Step#2---Copy over the methods and set them up
-(NSString*)print
{

    NSString* calStr = [NSString stringWithFormat:@" %i/%i ",numerator,denominator];
    return calStr;
}

@end

在接口(interface) .h 中实现 @property(assign)/* 之后 */来自@Anoop Vaidya 谢谢! :)

标题看起来像这样:

#import <Foundation/Foundation.h>

@interface Fraction : NSObject
#pragma mark --Step#1---What are the methods
/*  what is this program going to do?*/
@property (assign) NSInteger numerator; //NSInteger is typedef to int
@property (assign) NSInteger denominator;
-(NSString*)print;
@end

和 .h 文件:

#import "Fraction.h"

@implementation Fraction


/*  don't need these with the @property (assign) */
//-(void) setNumerator: (int) setNumerator
//{
//    #pragma mark --Step#8---Make sure the setter is on the right
//    /*  I had these back to front before  */
//     NSLog (@"setNumerator %d ", setNumerator);
//    _numerator = setNumerator;
//   
//}
//-(void) setDenominator: (int) setDenominator
//{
//     NSLog (@"setDenominator %d ", setDenominator);
//    _denominator = setDenominator;
//   
//}
#pragma mark --Step#2---Copy over the methods and set them up
-(NSString*)print
{

    NSString* calStr = [NSString stringWithFormat:@" %i/%i ",_numerator,_denominator];
    return calStr;
}

@end

Answer 1

代替:

setNumerator = numerator;

和

setDenominator = denominator;

换一种方式:

numerator = setNumerator;

和

denominator = setDenominator;