Question

我正在尝试创建一个UITextField，用户可以在1-10之间输入一个数字，以便给出10分。例如，5 / 10,9 / 10等。

理想情况下，我希望用户只能输入1到10，并显示为x / 10。其中x是用户输入的分数。

我一直在使用：

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

但我不确定下一步该做什么。任何帮助将不胜感激。

约什

Answer 1

请尝试以下代码，希望它能满足您所需的所有条件

- (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string
{
    NSString *resultingString = [textField.text stringByReplacingCharactersInRange: range withString: string];

        if (resultingString.length > 2 && range.length == 0)
        {
            return NO;
        }
        else
        {
            if (resultingString.length<=1) {
                return YES;
            }
            else
            {
                NSString *firstDigit = [resultingString substringToIndex:1];
                NSString *secondDigit = [resultingString substringFromIndex:1];
                if ([firstDigit intValue]>1) {
                    return NO;
                }
                else if ([secondDigit intValue]>0)
                {
                    if ([firstDigit intValue]==0) {
                        return YES;
                    }
                    return NO;
                }
                else
                {
                    return YES;
                }
            }
        }
}

Answer 2

试试这个

这样您只能输入1-10范围内的数字

#define NUMBERS_ONLY @"1234567890"
#define CHARACTER_LIMIT 2

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string  {
    NSUInteger newLength = [textField.text length] + [string length] - range.length;
    NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:NUMBERS_ONLY] invertedSet];
    NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
    NSString *myTextField = [textField.text stringByAppendingString:filtered];
    return (([string isEqualToString:filtered])&&(newLength <= CHARACTER_LIMIT)&&(myTextField.integerValue<=10));
}

Answer 3

试试这个

这将限制文本字段只输入一个字符

 public void Export_ex(string elem)
    {

            string elements = elem;
            HttpContext.Current.Response.ContentType = "data:application/vnd.ms-excel";
            HttpContext.Current.Response.AddHeader("content-disposition", "attachment; filename=Print.xls");
            HttpContext.Current.Response.Write("<html xmlns:x=\"urn:schemas-microsoft-com:office:excel\">");
            HttpContext.Current.Response.Write("<head>");
            HttpContext.Current.Response.Write("<div>");
            HttpContext.Current.Response.Write("<META http-equiv=\"Content-Type\" content=\"text/html; charset=utf-     8\">");
            HttpContext.Current.Response.Write("<!--[if gte mso 9]><xml>");
            HttpContext.Current.Response.Write("<x:ExcelWorkbook>");
            HttpContext.Current.Response.Write("<x:ExcelWorksheets>");
            HttpContext.Current.Response.Write("<x:ExcelWorksheet>");
            HttpContext.Current.Response.Write("<x:Name>Report Data</x:Name>");
            HttpContext.Current.Response.Write("<x:WorksheetOptions>");
            HttpContext.Current.Response.Write("<x:ValidPrinterInfo/>");
            HttpContext.Current.Response.Write("</x:Print>");
            HttpContext.Current.Response.Write("</x:WorksheetOptions>");
            HttpContext.Current.Response.Write("</x:ExcelWorksheet>");
            HttpContext.Current.Response.Write("</x:ExcelWorksheets>");
            HttpContext.Current.Response.Write("</x:ExcelWorkbook>");
            HttpContext.Current.Response.Write("</xml>");
            HttpContext.Current.Response.Write("<![endif]--> ");
            HttpContext.Current.Response.Write("</head>");
            HttpContext.Current.Response.Write(elements);

            HttpContext.Current.Response.Flush();
           // HttpContext.Current.Response.End();


        }

并将键盘类型设置为数字键盘，以便仅允许用户输入数字，用户只能输入0到9之间的数字。

希望它有所帮助。

输入10分为UITextField？

3 个答案: