iOS设置输入框只能输入正整数或小数，且小数位数不能超过两位

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- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{//    限制只能输入数字    BOOL isHaveDian = YES;    if ([string isEqualToString:@" "]) {        return NO;    }    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            if([textField.text length] == 0){                if(single == '.') {                    showMsg(@"数据格式有误");                    [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{                    showMsg(@"数据格式有误");                    [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{                        showMsg(@"最多两位小数");                        return NO;                    }                }else{                    return YES;                }            }        }else{//输入的数据格式不正确            showMsg(@"数据格式有误");            [textField.text stringByReplacingCharactersInRange:range withString:@""];            return NO;        }    }    else    {        return YES;    }}
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