NSDecimalNumber 小数点后加零（iPhone SDK）

发布于 2024-08-15 12:03:53 字数 1180 浏览 6 评论 0原文

我有以下代码，

(...)
numberStyle = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain
                                                                     scale:2
                                                          raiseOnExactness:NO
                                                           raiseOnOverflow:NO
                                                          raiseOnUnderflow:NO
                                                       raiseOnDivideByZero:NO];

strThree = textFieldThree.text;
strThree = [strThree stringByReplacingOccurrencesOfString:@"." withString:@""];

fieldOneDNa = (NSDecimalNumber *)[NSDecimalNumber decimalNumberWithString:strThree];
oneHundred = (NSDecimalNumber *)[NSDecimalNumber decimalNumberWithString:@"100"];
fieldOneDN = [fieldOneDNa decimalNumberByDividingBy:oneHundred
                                       withBehavior:numberStyle];

firstStepReturn = [fieldOneDN stringValue];
textFieldThree.text = firstStepReturn;
(...)

我希望能够让firstStepReturn 在小数点后有 2 位数字，即使它们是 .00 或 .*0。例如，如果在文本字段“textFieldThree”中输入 323.390，则它将被处理并作为 3233.90 返回到文本字段。目前显示为3233.9。

任何帮助将不胜感激。

原文

I have the following code

(...)
numberStyle = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain
                                                                     scale:2
                                                          raiseOnExactness:NO
                                                           raiseOnOverflow:NO
                                                          raiseOnUnderflow:NO
                                                       raiseOnDivideByZero:NO];

strThree = textFieldThree.text;
strThree = [strThree stringByReplacingOccurrencesOfString:@"." withString:@""];

fieldOneDNa = (NSDecimalNumber *)[NSDecimalNumber decimalNumberWithString:strThree];
oneHundred = (NSDecimalNumber *)[NSDecimalNumber decimalNumberWithString:@"100"];
fieldOneDN = [fieldOneDNa decimalNumberByDividingBy:oneHundred
                                       withBehavior:numberStyle];

firstStepReturn = [fieldOneDN stringValue];
textFieldThree.text = firstStepReturn;
(...)

I would like to be able to have firstStepReturn have 2 digits following the decimal point even if they are .00 or .*0. For example, if 323.390 was inputted into the textfield "textFieldThree", it would be processed and returned to the textfield as 3233.90. At the moment, it is displaying as 3233.9.

Any help would be greatly appreciated.

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猫弦 2024-08-22 12:03:53

NSDecimalNumber 是 NSNumber 的子类，因此您只需要使用 NSNumberFormatter


 NSDecimalNumber * dn = [NSDecimalNumber decimalNumberWithString:@"1234.5"];
 NSNumberFormatter * nf = [[NSNumberFormatter alloc] init];
 [nf setMinimumFractionDigits:2];
 [nf setMaximumFractionDigits:2];
 NSString *ns  = [nf stringFromNumber:dn];

Simples

NSDecimalNumber subclasses NSNumber so you just need to use NSNumberFormatter


 NSDecimalNumber * dn = [NSDecimalNumber decimalNumberWithString:@"1234.5"];
 NSNumberFormatter * nf = [[NSNumberFormatter alloc] init];
 [nf setMinimumFractionDigits:2];
 [nf setMaximumFractionDigits:2];
 NSString *ns  = [nf stringFromNumber:dn];

Simples

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