NSNumberFormatter numberFromString问题

Question

我需要从UITextfield获取一个字符串并将其格式化为以下内容：

rbenv

问题是当我在文本字段中键入0.999978并且格式化的数字是0.999978（这不是正确的）时它应该是0.999

Answer 1

尝试一下：

NSNumber  *aNum = [NSNumber numberWithDouble:[string doubleValue]];
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
[numberFormatter setPositiveFormat:@"##0.###"];
[numberFormatter setRoundingMode:NSNumberFormatterRoundFloor];

DLog(@"formatted string %@",[numberFormatter stringFromNumber:aNum]);