关于UITableView Cell Button的问题

给UITableView设置了一个button。

在viewDidLoad执行完，button就在右边，但是如果进行滚动。button就开始乱跑。

代码如下：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}

if (indexPath.section == 0 && indexPath.row == 0 && _isAddImageViewLoad == NO) {
    // Add Image Button
    UIButton *addImage = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImage* image = [UIImage imageNamed:@"AddImage@2x"];
    addImage.frame = CGRectMake(110.0f, 10.0f, 110.0f, 110.0f);
    [addImage setImage:image forState:UIControlStateNormal];

    [cell.contentView addSubview:addImage];
    _isAddImageViewLoad = YES;
} else {
    NSDictionary *dictionary = [_items objectAtIndex:indexPath.section];
    NSArray *array = [dictionary objectForKey:@"data"];
    NSString *cellValue = [array objectAtIndex:indexPath.row];
    cell.textLabel.text = cellValue;
}
return cell;
}