输入框TextField首位禁止输入0或.

来源：互联网发布：志鸿优化系列丛书2017 编辑：程序博客网时间：2024/06/08 11:35
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{    if ([textField.text rangeOfString:@"."].location == NSNotFound)    {        isHaveDian = NO;    }    if ([string length] > 0)    {        unichar single = [string characterAtIndex:0];//当前输入的字符        if ((single >= '0' && single <= '9') || single == '.')//数据格式正确        {            //首字母不能为0和小数点            if([textField.text length] == 0)            {                if(single == '.')                {                    [self showMyMessage:@"亲，第一个数字不能为小数点!"];                    [textField.text stringByReplacingCharactersInRange:range withString:@""];                    return NO;                }                if (single == '0')                {                    [self showMyMessage:@"亲，第一个数字不能为0!"];                    [textField.text stringByReplacingCharactersInRange:range withString:@""];                    return NO;                }            }            //输入的字符是否是小数点            if (single == '.')            {                if(!isHaveDian)//text中还没有小数点                {                    isHaveDian = YES;                    return YES;                }else{                    [self showMyMessage:@"亲，您已经输入过小数点了!"];                    [textField.text stringByReplacingCharactersInRange:range withString:@""];                    return NO;                }            }else{                if (isHaveDian) {//存在小数点                    //判断小数点的位数                    NSRange ran = [textField.text rangeOfString:@"."];                    if (range.location - ran.location <= 2) {                        return YES;                    }else{                        [self showMyMessage:@"亲，您最多输入两位小数!"];                        return NO;                    }                }else{                    return YES;                }            }        }else{//输入的数据格式不正确            [self showMyMessage:@"亲，您输入的格式不正确!"];            [textField.text stringByReplacingCharactersInRange:range withString:@""];            return NO;        }    }    else    {        return YES;    }}-(void)showMyMessage:(NSString*)aInfo {    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:aInfo delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];    [alertView show];}
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