Question

我无法理解为什么我会得到以下结果，我们将不胜感激。

NSString  *amountString =@"9,376.41";
double  amount = [amountString doubleValue];
NSLog(@"My Amount %f",amount);
My Amount 9.000000

Answer 1

在处理与字符串之间转换数字时，应始终使用正确配置的NSNumberFormatter

NSString *amountString = @"9,376.41";

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.numberStyle = NSNumberFormatterDecimalStyle;

NSNumber *amount = [formatter numberFromString:amountString];
NSLog(@"My Amount %@", amount);

您可以设置区域设置/格式以处理不同的千位分隔符等

Answer 2

使用stringByReplacingOccurrencesOfString取出逗号，它可以正常工作

NSString  *amountString =@"9,568,376.41";
NSString *outString = [amountString stringByReplacingOccurrencesOfString:@"," withString:@""];
double  amount = [outString doubleValue];
NSLog(@"My Amount %f",amount);
My Amount 9568376.410000

将NSString转换为double值时出现问题

2 个答案: