将NSNumberFormatter的负格式从（xxx.xx）更改为-xxx.xx [英] Change NSNumberFormatter's negative format from (xxx.xx) to -xxx.xx

问题描述

我想更改我的NSNumberformatter从显示负数的圆括号周围放置减号在前面（或任何本地化的标准是）。

我假设我可以用setNegativeFormat：

，但是读苹果的哦，抓住我的头：

---

setNegativeFormat ：

设置接收器用于显示负值的格式。

   - （void）setNegativeFormat：（NSString *）aFormat 
  

参数
aFormat
负值的格式。

可用性
适用于iPhone OS 2.0及更高版本。

另请参见
NSNumberFormatter .h

---

aFormat的选项是什么？

编辑：这里的价值是什么：

  NSNumberFormatter * currencyFormatter = [[NSNumberFormatter alloc] init]; 
 [currencyFormatter setNumberStyle：NSNumberFormatterCurrencyStyle]; 
  

对我来说保留本地化的货币符号&小数位数，无论它们是什么。所以[currencyFormatter setNegativeFormat：@ - ＃，## 0.00]可能不工作，因为货币缺失，不能假设所有货币的2位小数。

解决方案

如果您查看数据格式编程指南对于Cocoa ：

格式字符串使用 Unicode技术标准＃35 （此引用是版本tr35-6; Mac OS X v10.4的格式化程序使用版本 tr35-4 ）。

编辑：

如果您要根据货币设置格式字符串，可以使用 ¤字符，例如：

  [formatter setFormat：@¤＃，## 0.00 ]; 
  

这将添加当前本地化的货币符号代替

<$>

<$>

[formatter setFormat：@ - ¤＃，## 0.00];


这也将使用货币符号代替¤用于当前本地化。

I want to change my NSNumberformatter from displaying negative numbers with parenthesis around them to putting the minus sign in front (or whatever the localized standard is).

I would assume I could do this with setNegativeFormat:

but reading Apple's oh so thorough docs I am left scratching my head:

---

setNegativeFormat:

Sets the format the receiver uses to display negative values.

- (void)setNegativeFormat:(NSString *)aFormat

Parameters aFormat A string that specifies the format for negative values.

Availability Available in iPhone OS 2.0 and later.

See Also – negativeFormat

Declared In NSNumberFormatter.h

---

what are my options for aFormat?!? C'mon Doc Writers, would a link here kill you?

edit: for what it's worth here's the declaration:

NSNumberFormatter *currencyFormatter = [[NSNumberFormatter alloc] init];
[currencyFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];

It's important for me to retain the localized currency symbol & decimal places whatever they may be. So [currencyFormatter setNegativeFormat:@"-#,##0.00"] probably won't work as currency is missing and 2 decimals can't be assumed for all currencies.

解决方案

If you take a look at the "Format Strings" section in the Data Formatting Programming Guide For Cocoa:

The format string uses the format patterns from the Unicode Technical Standard #35 (this reference is to version tr35-6; formatters for Mac OS X v10.4 use version tr35-4).

Edit:

If you want to set a format string based on currencies, you can use the ¤ character, for example:

[formatter setFormat:@"¤#,##0.00"];

This will add the currency symbol for the current localization in place of the ¤ character.

Therefore, applying the same concept to the negative format string:

[formatter setFormat:@"-¤#,##0.00"];

This will also apply the currency symbol in place of the ¤ for the current localization.

这篇关于将NSNumberFormatter的负格式从（xxx.xx）更改为-xxx.xx的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！