如何在Objective-C / iOS中代表钱？ [英] How to represent money in Objective-C / iOS?

问题描述

我正在开发一款iPhone应用，想要代表金额（$）金额。我不能使用float因为它们会引入一定量的舍入错误。
我可以使用什么？

I'm working on an iPhone app and want to represent money ($) amounts. I can't use float because they introduce certain amount of rounding errors. What can I use?

我正在考虑定义自己的Money类，并在内部将美元和便士存储为NSInteger。

I'm thinking of defining my own Money class and store dollars and pennies as NSInteger internally.

@interface Money : NSObject {
    //$10.25 is stored as dollas=10 and pennies=25
    NSInteger dollars;
    NSInteger pennies;
}

另一种可能的表示（更容易添加和乘法）将是使用单个NSInteger为便士。

Another possible representation (easier for adding and multiplying) would be to use a single NSInteger as pennies.

@interface Money : NSObject {
    //$10.25 is stored as pennies=1025
    NSInteger pennies;
}

您有什么想法？我可以使用BigDecimal类型吗？

What are your thoughts? Is there a "BigDecimal" type I can use?

推荐答案

使用NSDecimalNumber。当然它有开销，但除非你能证明这是一个问题，否则你会喜欢它给你的准确性。

Use NSDecimalNumber. Sure it has overhead, but unless you can prove that's a problem, you'll love the accuracy it gives you.

http://www.cimgf.com/2008/04/23 / cocoa-tutorial-dont-be-lazy-with-nsdecimalnumber-like-me /
http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSDecimalNumber_Class/Reference/Reference.html

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