blocks|key|1333190|text|不要自己设置数字格式。您几乎肯定不会正确处理所有的边缘情况或正确处理所有可能的语言环境。使用NSNumberFormatter将数字数据格式化为本地化字符串表示形式。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1333191|您可以使用NSNumberFormatter实例方法-setGroupingSeparator:将分组分隔符设置为@","+(或者更好的设置为[[NSLocale+currentLocale]+objectForKey:NSLocaleGroupingSeparator]；感谢@ntesler)，并使用-setGroupingSize:将分组分隔符设置为每3位数一次。|1333192|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/mac/library/documentation/cocoa/reference/Foundation/Classes/NSNumberFormatter_Class/Reference/Reference.html^0|1A|H|1A|H|0|0|5|H|Q|M|1L|4|1Z|1T|48|H|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

Don't do your own number formatting. You will almost certainly not get all the edge cases right or correctly handle all possible locales. Use the <a href="http://developer.apple.com/mac/library/documentation/cocoa/reference/Foundation/Classes/NSNumberFormatter_Class/Reference/Reference.html" rel="noreferrer"><code>NSNumberFormatter</code></a> for formatting numeric data to a localized string representation.

You would use the <code>NSNumberFormatter</code> instance method <code>-setGroupingSeparator:</code> to set the grouping separator to <code>@","</code> (or better yet <code>[[NSLocale currentLocale] objectForKey:NSLocaleGroupingSeparator]</code>; thanks @ntesler) and <code>-setGroupingSize:</code> to put a grouping separator every 3 digits.

blocks|key|1118201|text|使用NSNumberFormatter。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1118202|具体地说：|1118203|NSNumberFormatter+*formatter+=+[NSNumberFormatter+new];
[formatter+setNumberStyle:NSNumberFormatterDecimalStyle];+//+this+line+is+important!

NSString+*formatted+=+[formatter+stringFromNumber:[NSNumber+numberWithInteger:2000000]];

[formatter+release];|code-block|syntax|javascript|1118204|默认情况下，NSNumberFormatter使用当前区域设置，因此分组分隔符默认设置为正确的值。关键是要记住设置一个数字样式。|1118205|entityMap^0|2|H|0|0|0|6|H|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

Use <code>NSNumberFormatter</code>.

Specifically:

<pre><code>NSNumberFormatter *formatter = [NSNumberFormatter new];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle]; // this line is important!

NSString *formatted = [formatter stringFromNumber:[NSNumber numberWithInteger:2000000]];

[formatter release];
</code></pre>

By default <code>NSNumberFormatter</code> uses the current locale so the grouping separators are set to their correct values by default. The key thing is to remember to set a number style.

blocks|key|1333280|text|有一个static+method+on+NSNumberFormatter可以做你需要的事情：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1333281|int+aNum+=+2000000;
NSString+*display+=+[NSNumberFormatter+localizedStringFromNumber:@(aNum)
+++++++++++++++++++++++++++++++++++++++++++++++++++++numberStyle:NSNumberFormatterDecimalStyle];|code-block|syntax|javascript|1333282|如果不需要对格式化程序进行任何额外的配置，这种方法比创建一个新的NSNumberFormatter更简洁一些。|1333283|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSNumberFormatter_Class/Reference/Reference.html#//apple_ref/occ/clm/NSNumberFormatter/localizedStringFromNumber:numberStyle:^0|K|H|3|Y|0|0|0|W|H|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

There's a <a href="https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSNumberFormatter_Class/Reference/Reference.html#//apple_ref/occ/clm/NSNumberFormatter/localizedStringFromNumber:numberStyle:" rel="noreferrer">static method on <code>NSNumberFormatter</code></a> that does just what you need:

<pre><code>int aNum = 2000000;
NSString *display = [NSNumberFormatter localizedStringFromNumber:@(aNum)
 numberStyle:NSNumberFormatterDecimalStyle];
</code></pre>

This way is a little more succinct than creating a new <code>NSNumberFormatter</code> if you don't need to do any additional configuration of the formatter.

blocks|key|1333308|text|更简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1333309|NSNumber+*someNumber+=+@(1234567890);
NSString+*modelNumberString+=+[NSString+localizedStringWithFormat:@"%25@",+someNumber];
NSLog(@"Number+with+commas:+%25@",+modelNumberString);|code-block|syntax|javascript|1333310|同事今天刚教我这个。#神奇|1333311|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Even easier:

<pre><code>NSNumber *someNumber = @(1234567890);
NSString *modelNumberString = [NSString localizedStringWithFormat:@"%@", someNumber];
NSLog(@"Number with commas: %@", modelNumberString);
</code></pre>

coworker just taught me this today. #amazing

blocks|key|1333338|text|Swift版本|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1333339|let+formatter+=+NSNumberFormatter()
formatter.numberStyle+=+.DecimalStyle
formatter.maximumFractionDigits+=+decimalPlaces
let+result+=+formatter.stringFromNumber(NSNumber(double:+8.0))|code-block|syntax|javascript|1333340|作者：http://ios.eezytutorials.com|offset|length|1333341|entityMap|0|LINK|mutability|MUTABLE|url|http://ios.eezytutorials.com/^0|0|0|3|S|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Swift version 

<pre><code>let formatter = NSNumberFormatter()
formatter.numberStyle = .DecimalStyle
formatter.maximumFractionDigits = decimalPlaces
let result = formatter.stringFromNumber(NSNumber(double: 8.0))
</code></pre>

By <a href="http://ios.eezytutorials.com" rel="nofollow">http://ios.eezytutorials.com</a>

blocks|key|1118356|text|一个简单的解决方案可能是这样。我的答案几乎和@Nazir的答案一样，但有一个小技巧。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1118357|double+current_balance+=+2000000.00;

NSNumberFormatter+*+formatter+=+[NSNumberFormatter+new];
[formatter+setNumberStyle:NSNumberFormatterDecimalStyle];
//[formatter+setNumberStyle:NSNumberFormatterCurrencyStyle];++//if+you+want+for+currency+with+$+sign
[formatter+setMinimumFractionDigits:2];+//+Set+this+if+you+need+2+digits
[formatter+setMaximumFractionDigits:2];+//+Set+this+if+you+need+2+digits
NSString+*+currency_format+=++[NSString+stringWithFormat:@"%25@",+[formatter+stringFromNumber:[NSNumber+numberWithDouble:current_balance]]];|code-block|syntax|javascript|1118358|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

An easy solution could be this. My answer is almost same like @Nazir's answer but with a small trick.

<pre><code>double current_balance = 2000000.00;

NSNumberFormatter * formatter = [NSNumberFormatter new];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
//[formatter setNumberStyle:NSNumberFormatterCurrencyStyle]; //if you want for currency with $ sign
[formatter setMinimumFractionDigits:2]; // Set this if you need 2 digits
[formatter setMaximumFractionDigits:2]; // Set this if you need 2 digits
NSString * currency_format = [NSString stringWithFormat:@"%@", [formatter stringFromNumber:[NSNumber numberWithDouble:current_balance]]];
</code></pre>

blocks|key|1118397|text|对于那些需要使用数字字符串而不仅仅是整数(即大数字)的人，我做了以下宏：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1118398|#define+addCommas(__string)+(\
(%5ENSString+*(void){\
NSString+*__numberString+=+__string;\
NSString+*__integerPortion+=+__numberString;\
NSString+*__decimalPortion+=+@"";\
if+([__string+containsString:@"."])+{\
__integerPortion+=+[__numberString+componentsSeparatedByString:@"."][0];\
__decimalPortion+=+st(@".%25@",+[__numberString+componentsSeparatedByString:@"."][1]);\
}\
int+__i+=+(int)__integerPortion.length-3;\
while+(__i+>+0)+{\
__integerPortion+=+st(@"%25@,%25@",+substringInRange(__integerPortion,+0,+__i),+substringInRange(__integerPortion,+__i,+(int)__integerPortion.length));\
__i+-=+3;\
}\
__numberString+=+st(@"%25@%25@",+__integerPortion,+__decimalPortion);\
return+__numberString;\
})()\
)|code-block|syntax|javascript|1118399|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For those who need to do it with strings of numbers and not just integers (I.e. Big Numbers) I made the following macro:

<pre><code>#define addCommas(__string) (\
(^NSString *(void){\
NSString *__numberString = __string;\
NSString *__integerPortion = __numberString;\
NSString *__decimalPortion = @"";\
if ([__string containsString:@"."]) {\
__integerPortion = [__numberString componentsSeparatedByString:@"."][0];\
__decimalPortion = st(@".%@", [__numberString componentsSeparatedByString:@"."][1]);\
}\
int __i = (int)__integerPortion.length-3;\
while (__i &gt; 0) {\
__integerPortion = st(@"%@,%@", substringInRange(__integerPortion, 0, __i), substringInRange(__integerPortion, __i, (int)__integerPortion.length));\
__i -= 3;\
}\
__numberString = st(@"%@%@", __integerPortion, __decimalPortion);\
return __numberString;\
})()\
)
</code></pre>

If I have a number <code>int aNum = 2000000</code> how do I format this so that I can display it as the NSString 2,000,000?

How to add commas to number every 3 digits in Objective C?

Swift

如果我有一个数字int aNum = 2000000，我如何格式化它，以便我可以将它显示为NSString 2,000,000？

问如何在Objective C中为每3位数字添加逗号？
EN

回答 7

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在Objective C中为每3位数字添加逗号？EN

回答 7

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在Objective C中为每3位数字添加逗号？
EN