我有自定义单元格的uitableview.Custom单元格包含一些字段，如label.I使用dispatch_async从耗时的过程中获取数据，然后更新main中的单元格属性。但是我在滚动时遇到自定义单元格数据的闪烁。我有：
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
OpenOrdersCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CellIndetifier"];
LanguageModule *langModule=[LanguageModule sharedModule];
if (!cell) {
UIViewController *controller = [[UIViewController alloc] initWithNibName:@"OpenOrdersCell" bundle:nil];
cell = (OpenOrdersCell *)controller.view;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.contentView.clipsToBounds = YES;
[cell setBackgroundColor:[UIColor colorWithRed:238.0f/255.0f green:238.0f/255.0f blue:238.0f/255.0f alpha:1.0f]];
}
Order *order = [self.arrayOfOpenOrders objectAtIndex:indexPath.row];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, NULL), ^
{
NSString *str = [langModule getLocalizedString:@"Select"];
dispatch_async(dispatch_get_main_queue(), ^
{
[cell.detailButton setTitle:str forState:UIControlStateNormal];
cell.detailButton.tag = indexPath.row + 1;
[cell.detailButton addTarget:self action:@selector(detailButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
});
});
if ([order.mStatus intValue] == 0)//called from closed order class
{
// [cell.sendInvoiceButton setTitle:[langModule getLocalizedString:@"Reorder"] forState:UIControlStateNormal];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, NULL), ^
{
NSString *str = [langModule getLocalizedString:@"Send Receipt"];
dispatch_async(dispatch_get_main_queue(), ^
{
[cell.sendInvoiceButton setTitle:str forState:UIControlStateNormal];
cell.sendInvoiceButton.tag = indexPath.row + 1;
[cell.sendInvoiceButton addTarget:self action:@selector(sendInvoiceButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
CGFloat x = cell.detailButton.frame.origin.x;//original x
if ([Utils getSendInvoiceOption] == FALSE) {
[cell.sendInvoiceButton setHidden:YES];
cell.detailButton.frame = CGRectMake(cell.sendInvoiceButton.frame.origin.x+30, cell.detailButton.frame.origin.y, cell.detailButton.frame.size.width, cell.detailButton.frame.size.height);
}
else
{
cell.detailButton.frame = CGRectMake(x, cell.detailButton.frame.origin.y, cell.detailButton.frame.size.width, cell.detailButton.frame.size.height);
[cell.sendInvoiceButton setHidden:NO];
}
});
});
}
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, NULL), ^
{
NSString *str = [langModule getLocalizedString:[NSString stringWithFormat:@"%@",order.mDateTime]];
dispatch_async(dispatch_get_main_queue(), ^
{
cell.dateTimeLabel.text = str;
});
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, NULL), ^
{
NSString *str = [langModule getLocalizedString:[NSString stringWithFormat:@"%@",order.mOrderId]];
dispatch_async(dispatch_get_main_queue(), ^
{
cell.orderIdLabel.text = str;
});
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, NULL), ^
{
NSString *str = [langModule getLocalizedString:order.mTotalItems];
dispatch_async(dispatch_get_main_queue(), ^
{
cell.totalItemsLabel.text = str;
});
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, NULL), ^
{
NSString *str = [Utils currencyWithSymbol:[NSString stringWithFormat:@"%.02f", [order.mTotalAmount floatValue]]];
dispatch_async(dispatch_get_main_queue(), ^
{
cell.totalAmountLabel.text = str;
});
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, NULL), ^
{
dispatch_async(dispatch_get_main_queue(), ^
{
});
});
if (IndexPath && IndexPath.row == indexPath.row)
{
[cell.contentView addSubview:expandedCellView];
}
cell.contentView.tag = indexPath.row + 1;
return cell;
}
如果有人可以建议我，如何解决这个问题。