Question

我正在寻找一种在不使用TextField hack的情况下将字符串格式化为货币的方法。

例如，我希望将数字“521242”转换为“5,212.42” 或者，如果我的数字低于1美元，我希望它看起来像这样：“52” - ＆gt; “0.52”

由于

Answer 1

你可能想要这样的东西（假设货币是浮动的）：

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setNumberStyle: NSNumberFormatterCurrencyStyle];
NSString *numberAsString = [numberFormatter stringFromNumber:[NSNumber numberWithFloat:currency]];

根据您的要求将52视为.52，您可能需要除以100.0。

这种方法的好处是它会尊重当前的语言环境。因此，在适当的情况下，它会将您的示例格式化为“5.212,42”。

更新的在发布我的例子时，我或许有点快。如下面的Conrad Shultz所指出的，在处理货币金额时，最好将数量存储为NSDecimalNumber s。这将极大地减少带有舍入误差的麻烦。如果您执行此操作，则上面的代码段变为（假设货币为NSDecimalNumber*）：

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setNumberStyle: NSNumberFormatterCurrencyStyle];
NSString *numberAsString = [numberFormatter stringFromNumber:currency];

Answer 2

我使用此代码。这项工作对我来说

1）将UITextField Delegate添加到头文件

2）添加此代码（启用ARC）

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

NSString *cleanCentString = [[textField.text
                              componentsSeparatedByCharactersInSet:
                              [[NSCharacterSet decimalDigitCharacterSet] invertedSet]]
                             componentsJoinedByString:@""];
// Parse final integer value
NSInteger centAmount = cleanCentString.integerValue;
// Check the user input
if (string.length > 0)
{
    // Digit added
    centAmount = centAmount * 10 + string.integerValue;
}
else
{
    // Digit deleted
    centAmount = centAmount / 10;
}
// Update call amount value
NSNumber *amount = [[NSNumber alloc] initWithFloat:(float)centAmount / 100.0f];
// Write amount with currency symbols to the textfield
NSNumberFormatter *_currencyFormatter = [[NSNumberFormatter alloc] init];
[_currencyFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
[_currencyFormatter setCurrencyCode:@"USD"];
[_currencyFormatter setNegativeFormat:@"-¤#,##0.00"];
textField.text = [_currencyFormatter stringFromNumber:amount];
return NO; }

Answer 3

使用以下代码，它将解决您的所有问题......

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setNumberStyle: NSNumberFormatterCurrencyStyle];
NSString *numberAsString = [numberFormatter stringFromNumber:[NSNumber numberWithDouble:[currency doubleValue]]];

Answer 4

这是我发现使用NSDecimalNumbers重新编写AAV答案。

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

NSString *cleanCentString = [[textField.text
                              componentsSeparatedByCharactersInSet:
                              [[NSCharacterSet decimalDigitCharacterSet] invertedSet]]
                             componentsJoinedByString:@""];


// Parse final integer value
NSDecimalNumber *price = [NSDecimalNumber decimalNumberWithMantissa:[cleanCentString integerValue]
                                                           exponent:-2
                                                         isNegative:NO];

NSDecimalNumber *entry = [NSDecimalNumber decimalNumberWithMantissa:[string integerValue]
                                                           exponent:-2
                                                         isNegative:NO];

NSDecimalNumber *multiplier = [NSDecimalNumber decimalNumberWithMantissa:1
                                                            exponent:1
                                                          isNegative:NO];

NSDecimalNumberHandler *handler = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain
                                                                                         scale:2
                                                                              raiseOnExactness:NO
                                                                               raiseOnOverflow:NO
                                                                              raiseOnUnderflow:NO
                                                                           raiseOnDivideByZero:NO];
NSDecimalNumber *result;

// Check the user input
if (string.length > 0)
{
    // Digit added
    result = [price decimalNumberByMultiplyingBy:multiplier withBehavior:handler];
    result = [result decimalNumberByAdding:entry];
}
else
{
    // Digit deleted
    result = [price decimalNumberByDividingBy:multiplier withBehavior:handler];
}

// Write amount with currency symbols to the textfield
NSNumberFormatter *_currencyFormatter = [[NSNumberFormatter alloc] init];
[_currencyFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
[_currencyFormatter setCurrencyCode:@"USD"];
textField.text = [_currencyFormatter stringFromNumber:result];

return NO;
}

Answer 5

func getCurrencyFormat(price:String)->String{
    let convertPrice = NSNumber(double: Double(price)!)
    let formatter = NSNumberFormatter()
    formatter.numberStyle = .CurrencyStyle
    formatter.currencyCode = "USD"        

    let convertedPrice = formatter.stringFromNumber(convertPrice)       
    return convertedPrice!
}

注意： - 货币代码是三字母代码，在大多数情况下，由一个国家的双字符互联网国家代码加上一个额外的字符来表示货币单位。例如，澳元的货币代码是“澳元”。

Answer 6

对于Swift测试代码（参考AAV代码）

func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool{

    let strMain : NSString = string

    let arrTemp : NSArray = (textField.text?.componentsSeparatedByCharactersInSet(NSCharacterSet.decimalDigitCharacterSet().invertedSet))!
    let str: NSString = arrTemp.componentsJoinedByString("")

    //NSInteger centAmount = cleanCentString.integerValue;
    var centAmount : NSInteger = str.integerValue

    if (string.length > 0)
    {
        // Digit added
        centAmount = centAmount * 10 + strMain.integerValue;
    }
    else {
        // Digit deleted
        centAmount = centAmount / 10;
    }

    let amount = (Double(centAmount) / 100.0)

    let currencyFormatter = NSNumberFormatter()
    currencyFormatter.numberStyle = .CurrencyStyle
    currencyFormatter.currencyCode = "USD"
    currencyFormatter.negativeFormat = "-¤#,##0.00"
    let convertedPrice = currencyFormatter.stringFromNumber(amount)

    print(convertedPrice)

    txtAmount.text = convertedPrice! //set text to your textfiled
    return false //return false for exact out put
}

注意：如果您想从输入中删除默认货币符号，可以使用currencySymbol为空白，如下所示

currencyFormatter.currencyCode = nil
currencyFormatter.currencySymbol = ""

快乐的编码！

Answer 7

使用格式化程序的一件事是它们的创建成本很高。最好为每个视图或视图控制器创建一次。使用 lazy 是避免这种开销的完美解决方案。这也将许多样板文件移出了主代码。

class MyViewController: UIViewController {
    @IBOutlet var priceLabel: UILabel!

    private lazy var currencyFormatter: NumberFormatter = {
        let formatter = NumberFormatter()
        formatter.currencySymbol = "$"
        formatter.numberStyle = .currency
        return formatter
    }()

     // rest of class
 }

要使用它，如别处所述，最好使用 Decimal 表示货币，Double 是近似值。

priceLabel.text = currencyFormatter.string(for: Decimal(9.48))

输出：

$9.48

如何在ios上正确格式化货币

7 个答案: