demo: 源码下载：DMLimtDemo.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：
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#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
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