iOS中金额字符串格式化显示的方法示例

- (NSString *)moneyFormat:(NSString *)money {
 if (!money || money.length == 0) {
 return money;
 }

 BOOL hasPoint = NO;
 if ([money rangeOfString:@"."].length > 0) {
 hasPoint = YES;
 }

 NSMutableString *pointMoney = [NSMutableString stringWithString:money];
 if (hasPoint == NO) {
 [pointMoney appendString:@".00"];
 }

 NSArray *moneys = [pointMoney componentsSeparatedByString:@"."];
 if (moneys.count > 2) {
 return pointMoney;
 } else if (moneys.count == 1) {
 return [NSString stringWithFormat:@"%@.00", moneys[0]];
 } else {
 // 整数部分每隔 3 位插入一个逗号
 NSString *frontMoney = [self stringFormatToThreeBit:moneys[0]];
 if ([frontMoney isEqualToString:@""]) {
  frontMoney = @"0";
 }
 // 拼接整数和小数两部分
 NSString *backMoney = moneys[1];
 if ([backMoney length] == 1) {
  return [NSString stringWithFormat:@"%@.%@0", frontMoney, backMoney];
 } else if ([backMoney length] > 2) {
  return [NSString stringWithFormat:@"%@.%@", frontMoney, [backMoney substringToIndex:2]];
 } else {
  return [NSString stringWithFormat:@"%@.%@", frontMoney, backMoney];
 }
 }
}

- (NSString *)stringFormatToThreeBit:(NSString *)string {
 NSString *tempString = [string stringByReplacingOccurrencesOfString:@"," withString:@""];
 NSMutableString *mutableString = [NSMutableString stringWithString:tempString];
 NSInteger n = 2;
 for (NSInteger i = tempString.length - 3; i > 0; i--) {
 n++;
 if (n == 3) {
  [mutableString insertString:@"," atIndex:i];
  n = 0;
 }
 }
 return mutableString;
}

- (NSString *)formatDecimalNumber:(NSString *)string {
 if (!string || string.length == 0) {
 return string;
 }
 
 NSNumber *number = @([string doubleValue]);
 NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
 formatter.numberStyle = kCFNumberFormatterDecimalStyle;
 formatter.positiveFormat = @"###,##0.00";
 
 NSString *amountString = [formatter stringFromNumber:number];
 return amountString;
}