iOS开发之数字每隔3位用逗号分隔

demo: 源码下载：http://xiazai.jb51.net/201709/yuanma/DMLimtDemo_jb51.rar

之前做电商类APP时，针对稍大的金额展示时，需要每隔千位添加逗号便于用户识别。

逻辑比较简单，这里按需要写了一个可选前后缀的一个转换方法：

#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 

示意图：

总结

以上所述是小编给大家介绍的iOS开发之数字每隔3位用逗号分隔，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对我们网站的支持！