将货币字符串转换为NSDecimalNumber [英] Converting currency string into NSDecimalNumber

问题描述

我正在尝试使用以下代码将某些货币字符串(例如$ 25,000)转换为NSDecimalNumber:

I'm trying to convert some currency string (e.g., $25,000) into NSDecimalNumber using the following code:

NSNumberFormatter *currencyFormatter = [[NSNumberFormatter alloc] init];
[currencyFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
[currencyFormatter setGeneratesDecimalNumbers:TRUE];
[currencyFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];

// textField.text is some currency string (e.g., $25,000)
NSDecimalNumber *decimalNumber = [currencyFormatter numberFromString:textField.text];

编译器在抱怨currencyFormatter的结果类型，它是NSNumber而不是NSDecimalNumber，但是我在这里设置:

The compiler is complaining about the resulting type of currencyFormatter, is NSNumber instead of NSDecimalNumber but I'm setting this here:

[currencyFormatter setGeneratesDecimalNumber:TRUE];

所以我迷路了.有什么想法吗?

So I'm lost. Any ideas?

推荐答案

NSDecimalNumber是NSNumber的子类. NSNumberFormatter的numberFromString:方法被声明为返回NSNumber*，因此您需要添加强制类型转换:

NSDecimalNumber is a subclass of NSNumber. The numberFromString: method of NSNumberFormatter is declared to return NSNumber*, so you need to add a cast:

NSDecimalNumber *decimalNumber = (NSDecimalNumber*)[currencyFormatter numberFromString:textField.text];

由于您已将行为设置为产生十进制数字，所以这将正常工作.

Since you have set the behavior to produce decimal numbers, this will work correctly.

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