iOS开发之数字每隔3位用逗号分隔

  • Z时代
  • 2024-01-10
  • 分类：综合

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

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