UITableViewCell的分割线左侧对齐

一般设置cell时使用    

    cell.separatorInset = UIEdgeInsetsMake(top, left, bottom, right);

 但此方法不能使分割线对齐屏幕最左边

在tableView代理中设置可以是分割线左对齐

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
        [cell setSeparatorInset:UIEdgeInsetsZero];
    }
    
    if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
        [cell setLayoutMargins:UIEdgeInsetsZero];
    }
    
    if([cell respondsToSelector:@selector(setPreservesSuperviewLayoutMargins:)]){
        [cell setPreservesSuperviewLayoutMargins:NO];
    }
}