iOS|iOS - 3位数添加一个逗号 iOS-3位数添加一个逗号

【iOS|iOS - 3位数添加一个逗号】添加如下NSString类别，代码如下：
.h

#import @interface NSString (Comma)+(NSString*)strmethodComma:(NSString*)string; @end

#import "NSString+Comma.h"@implementation NSString (Comma)+(NSString*)strmethodComma:(NSString*)str {NSString *intStr; NSString *floStr; if ([str containsString:@"."]) {NSRange range = [str rangeOfString:@"."]; floStr = [str substringFromIndex:range.location]; intStr = [str substringToIndex:range.location]; }else{floStr = @""; intStr = str; }if (intStr.length <=3) {return [intStr stringByAppendingString:floStr]; }else{NSInteger length = intStr.length; NSInteger count = length/3; NSInteger y = length%3; NSString *tit = [intStr substringToIndex:y] ; NSMutableString *det = [[intStr substringFromIndex:y] mutableCopy]; for (int i =0; i < count; i ++) {NSInteger index = i + i *3; [det insertString:@","atIndex:index]; }if (y ==0) {det = [[det substringFromIndex:1]mutableCopy]; }intStr = [tit stringByAppendingString:det]; return [intStr stringByAppendingString:floStr]; } } @end

简便方式请参考：https://www.jianshu.com/p/3689f115ff18
http://www.unicode.org/reports/tr35/tr35-31/tr35-numbers.html#Number_Format_Patterns
感谢！