问题描述

您好，我正在尝试在 Table 的 cell.image 中获取 facebook 用户的个人资料图片.但它减慢了表格视图的滚动.然后我使用了 图像的异步加载链接但我很困惑如何在我的表格方法中使用它

Hello I am trying to get profile image of facebook user in Table's cell.image. But It slows down Scrolling of Table view.Then I used Asynchronous loading of image link But i am confused how could I use this in my Table's method

    - (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;
    }

推荐答案

它变慢了，因为每次调用 cellForRowAtIndexPath: 时你都在设置 image.仅在 if (cell == nil) 块内将图像添加到单元格的 imageView.然后你会看到滚动的改进.

Its slows down because you are setting the image every time the cellForRowAtIndexPath: is called. Add the image to the cell's imageView only inside the if (cell == nil) block. Then you will see the improvement in scrolling.

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