White space before separator line into my TableView

The leading whitespace is provided by default in iOS 7, even for custom cells.

Checkout this property separatorInset of UITableviewCell to remove/add white spacing at either ends of cell’s line separator.

// Remove white space

cell.separatorInset = UIEdgeInsetsZero;

Alternatively, at UITableView level, you can use this property –

if ([tableView respondsToSelector:@selector(setSeparatorInset:)]) {  // Safety check for below iOS 7 
    [tableView setSeparatorInset:UIEdgeInsetsZero];
}

Update – Below code works on iOS 7 and iOS 8:

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

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

-(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];
    }
}