Question

我找到了下面的代码，我正在尝试在UITableView shouldChangeCharactersInRange事件中工作。没有货币符号，它可以正常工作。

当我尝试添加货币符号时，它只允许我输入一个数字。它应该做的是，比如我输入7536，它应该出现在以下步骤：£0.07，£0.75，£7.53，£75.36，但它显示为£0.07，£0.05，£0.03，£0.06

继承代码。

- (BOOL)textField:(UITextField *)textField 
        shouldChangeCharactersInRange:(NSRange)range 
        replacementString:(NSString *)string
{    BOOL res = TRUE;

    double currentValue = [textField.text doubleValue];
    double cents = round(currentValue * 100.0f);

    if ([string length]) {
        for (size_t i = 0; i < [string length]; i++) {
            unichar c = [string characterAtIndex:i];
            if (isnumber(c)) {
                cents *= 10;
                cents += c - '0'; 
            }            
        }
    } else {
        // back Space
        cents = floor(cents / 10);
    }

    // This line next works without the currency symbol
    //textField.text = [NSString stringWithFormat:@"%.2f", cents / 100.0f];

    NSMutableString *aString = [NSMutableString stringWithFormat:@"%@", strCurrencySymbol];    
    [aString appendFormat:@"%.2f", cents / 100.0f];
    textField.text = aString;

    res = NO;
return res;

}

Answer 1

[@"£1.23" doubleValue]为0.如果有一个货币符号，您必须跳过一个主要货币符号，例如：

NSString * currentText = textField.text;
NSRange range = [currentText rangeOfString:strCurrencySymbol];
if (range.location == 0)
{
  currentText = [currentText substringFromIndex:range.length];
}
double currentValue = [currentText doubleValue];

一般来说，我建议不要做这样的事情：

它可能不适用于所有输入方法（并且IIRC shouldChangeCharactersInRange：不会调用自动填充）。
它似乎不是用户友好的，除非你在收银台工作（他们有一个“00”键，因为否则输入“$ 100.00”是一种痛苦）。我希望能够输入“1”并表示$ 1.00
它没有本地化。

Answer 2

    NSCharacterSet *currencySet = [NSCharacterSet characterSetWithCharactersInString:@"$€£¥"];
    NSMutableString *strSource = [NSMutableString stringWithString:textField.text];
    if (![strSource isEqualToString:@""]) {
        [strSource replaceCharactersInRange: [strSource rangeOfCharacterFromSet:currencySet]  withString:@""];
    }

    double currentValue = [strSource doubleValue];
    double cents = round(currentValue * 100.0f);

    if ([string length]) {
        for (size_t i = 0; i < [string length]; i++) {
            unichar c = [string characterAtIndex:i];
            if (isnumber(c)) {
                cents *= 10;
                cents += c - '0'; 
            }            
        }
    } else {
        // back Space
        cents = floor(cents / 10);
    }

    NSMutableString *aString = [NSMutableString stringWithFormat:@"%@", strCurrencySymbol];    // does not need to be released. Needs to be retained if you need to keep use it after the current function.
    switch (intDecimalPlaces) {
        case 0:
            [aString appendFormat:@"%.0f", cents / 100.0f];
            break;
        case 1:
            [aString appendFormat:@"%.1f", cents / 100.0f];
            break;
        case 2:
            [aString appendFormat:@"%.2f", cents / 100.0f];
            break;
        case 3:
            [aString appendFormat:@"%.3f", cents / 100.0f];             
            break;
        default:
            break;
    }

    textField.text = aString;

我忘了在开始时删除货币符号。然后你最后添加它没有问题。

iPhone：如何在shouldChangeCharactersInRange中添加货币符号，小数点和小数位

2 个答案: