cell分割线宽度为屏宽

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPat{

if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {

[cell setLayoutMargins:UIEdgeInsetsZero];

}

if ([cell respondsToSelector:@selector(setSeparatorInset:)]){

[cell setSeparatorInset:UIEdgeInsetsZero];

}

}