将数字转为每隔3位整数由逗号“,”分隔的字符串

import "DMViewController.h"

@interface DMViewController ()
@property (weak, nonatomic) IBOutlet UITextField *titleText;
@property (weak, nonatomic) IBOutlet UILabel *numLab;
@end
@implementation DMViewController

• (IBAction)tapButtonAction:(id)sender {
  UIButton *tempBut = (UIButton *)sender;
  if (tempBut.isSelected) {
  tempBut.selected = NO;
  _numLab.text = @"label";
  } else {
  tempBut.selected = YES;
  NSString *newNumber = [self separateNumberUseCommaWith:_titleText.text];
  _numLab.text = newNumber;
  }
  }
  // 将数字转为每隔3位整数由逗号“,”分隔的字符串
• (NSString *)separateNumberUseCommaWith:(NSString *)number {
  // 前缀
  NSString *prefix = @"￥";
  // 后缀
  NSString *suffix = @"元";
  // 分隔符
  NSString *divide = @",";
  NSString *integer = @"";
  NSString *radixPoint = @"";
  BOOL contains = NO;
  if ([number containsString:@"."]) {
  contains = YES;
  // 若传入浮点数，则需要将小数点后的数字分离出来
  NSArray *comArray = [number componentsSeparatedByString:@"."];
  integer = [comArray firstObject];
  radixPoint = [comArray lastObject];
  } else {
  integer = number;
  }
  // 将整数按各个字符为一组拆分成数组
  NSMutableArray *integerArray = [[NSMutableArray alloc] init];
  for (int i = 0; i < integer.length; i ++) {
  NSString *subString = [integer substringWithRange:NSMakeRange(i, 1)];
  [integerArray addObject:subString];
  }
  // 将整数数组倒序每隔3个字符添加一个逗号“,”
  NSString *newNumber = @"";
  for (NSInteger i = 0 ; i < integerArray.count ; i ++) {
  NSString *getString = @"";
  NSInteger index = (integerArray.count-1) - i;
  if (integerArray.count > index) {
  getString = [integerArray objectAtIndex:index];
  }
  BOOL result = YES;
  if (index == 0 && integerArray.count%3 == 0) {
  result = NO;
  }
  if ((i+1)%3 == 0 && result) {
  newNumber = [NSString stringWithFormat:@"%@%@%@",divide,getString,newNumber];
  } else {
  newNumber = [NSString stringWithFormat:@"%@%@",getString,newNumber];
  }
  }
  if (contains) {
  newNumber = [NSString stringWithFormat:@"%@.%@",newNumber,radixPoint];
  }
  if (![prefix isEqualToString:@""]) {
  newNumber = [NSString stringWithFormat:@"%@%@",prefix,newNumber];
  }
  if (![suffix isEqualToString:@""]) {
  newNumber = [NSString stringWithFormat:@"%@%@",newNumber,suffix];
  }
  return newNumber;
  }
  @end