public override bool ShouldChangeCharacters(UITextField textField, NSRange range, string replacementString)
{
var text = textField.Text;
string newText = text;
if (range.Location >= text.Length)
{
newText = text + replacementString;
}
else
{
var substr = text.Substring(0, range.Location);
var finalIndex = range.Location + range.Length - 1;
if (finalIndex >= text.Length - 1)
{
newText = substr + replacementString;
}
else
{
var substr2 = text.Substring(finalIndex + 1);
newText = substr + replacementString + substr2;
}
}
var numText = NumberFormattingHelper.StripCurrency(newText);
if (numText.Length > _digitLimit)
{
return(false);
}
string result = string.Empty;
if (numText.Length == 0)
{
result = "$0";
}
else
{
int number;
if (Int32.TryParse(numText, System.Globalization.NumberStyles.Currency, System.Globalization.CultureInfo.CurrentCulture, out number))
{
result = string.Format("{0:C0}", number);
}
}
if (_postChangeAction != null)
{
_postChangeAction(result);
}
textField.Text = result;
return(false);
}
private int?ParseResult(string text)
{
if (NumberFormattingHelper.IsEmptyValue(text))
{
return(0);
}
int result;
if (Int32.TryParse(text, System.Globalization.NumberStyles.Currency, System.Globalization.CultureInfo.CurrentCulture, out result))
{
return(result);
}
return(null);
}
