包含UIKeyboardType.NumberPad和非数字文本的UITextField

Question

我使用TextField从特定形式的xxx-xxx-xx-xx中获取用户编号。

我需要显示用户NumberPad键盘和添加分隔符"-"，在编辑期间的3,6和8位数字。

问题是，当我指定

TextField.keyboardType = UIKeyboardType.NumberPad

和添加分隔符在我的textFieldDidChange方法中，TextField停止响应添加下一个字符或删除。

更改为UIKeyboardType.Default可以正常工作，但键盘不只是数字。

Answer 1

您好，您可以使用以下代码。

txtField.keyboardType = UIKeyboardTypeNumberPad；

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

@try
{
    NSString *filter = @"(###) - (###) - (####)"; //Change Fileter As Per requirement. 

    if(!filter) return YES; // No filter provided, allow anything

    NSString *changedString = [textField.text stringByReplacingCharactersInRange:range withString:string];

    if(range.length == 1 && // Only do for single deletes
       string.length < range.length &&
       [[textField.text substringWithRange:range] rangeOfCharacterFromSet:[NSCharacterSet characterSetWithCharactersInString:@"0123456789"]].location == NSNotFound)
    {
        // Something was deleted.  Delete past the previous number
        NSInteger location = changedString.length-1;
        if(location > 0)
        {
            for(; location > 0; location--)
            {
                if(isdigit([changedString characterAtIndex:location]))
                {
                    break;
                }
            }
            changedString = [changedString substringToIndex:location];
        }
    }

    textField.text = filteredPhoneStringFromStringWithFilter(changedString, filter);

    return NO;

}
@catch (NSException *exception) {
    NSLog(@"Exception shouldChange %@",[exception description]);
}

Answer 2

在下面的UITextField委托方法下面使用此方法，

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{   
    if (textField == numberTextField)
    {
        if (range.location == 12) {
            return NO;
        }

        // Reject appending non-digit characters
        if (range.length == 0 &&
            ![[NSCharacterSet decimalDigitCharacterSet] characterIsMember:[string characterAtIndex:0]]) {
            return NO;
        }

        // Auto-add hyphen before appending 4rd or 7th digit or 10th digit
        if (range.length == 0 &&
            (range.location == 3 || range.location == 7 || range.location == 10)) {
            textField.text = [NSString stringWithFormat:@"%@-%@", textField.text, string];
            return NO;
        }

        // Delete hyphen when deleting its trailing digit
        if (range.length == 1 &&
            (range.location == 4 || range.location == 8))  {
            range.location--;
            range.length = 2;
            textField.text = [textField.text stringByReplacingCharactersInRange:range withString:@""];
            return NO;
        }

        return YES;
    }
    return YES;
}

希望能对你有所帮助

Answer 3

在shouldChangeCharactersInRange中，方法运行得很好。谢谢。