在ios8上 [TableView setSeparatorInset:UIEdgeInsetsMake(0,0,0,0)];不起作用 经过测试加入下面方法 在ios7 8上都可以正常工作

 -(void)viewDidLayoutSubviews
 {
     if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {
         [self.tableView setSeparatorInset:UIEdgeInsetsMake(,,,)];
     }

     if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {
         [self.tableView setLayoutMargins:UIEdgeInsetsMake(,,,)];
     }
 }

 -(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];
     }
 }