iphone - uitableViewcell 中的 UIImage 会减慢滚动表的速度

Question

您好，我正在尝试在表的 cell.image 中获取 facebook 用户的个人资料图像。但它减慢了表格 View 的滚动速度。然后我使用了Asynchronous loading of image link 但我很困惑我怎么能在我的表的方法中使用它

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

        static NSString *CellIdentifier = @"Cell";

        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
        if (cell == nil) {
            cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
        }

        cell.textLabel.font = [ UIFont fontWithName:@"Arial" size:10.0];
        cell.textLabel.numberOfLines = 0;

        cell.textLabel.text = [NSString stringWithFormat:@"%@",[(Facebook *)[dummyArray objectAtIndex:indexPath.row] sender]];

        cell.detailTextLabel.text =[NSString stringWithFormat:@"%@",[(Facebook *)[dummyArray objectAtIndex:indexPath.row] post]];

        NSString *get_string = [NSString stringWithFormat:@"%@/picture",[(Facebook *)[dummyArray objectAtIndex:indexPath.row]senderId]];

        AsynchronousImageView *image = [[AsynchronousImageview alloc]init];
[image loadImagewithUrlString:getString];

        FbGraphResponse *fb_graph_response = [fbGraph doGraphGet:get_string withGetVars:nil];

        UIImageView *image_view = [[UIImageView alloc] initWithImage:fb_graph_response.imageResponse];


        cell.imageView.image = image_view.image;



        [image_view release];


        return cell;
    }

Answer 1

它变慢是因为每次调用 cellForRowAtIndexPath: 时您都在设置 image。仅在 if (cell == nil) block 内将图像添加到单元格的 imageView。然后您会看到滚动方面的改进。