在 3GS 上运行的 iPhone 应用程序中的滚动问题

Question

当我在 iPhone 3S 上运行以下方法时，会导致滚动问题。我知道我们可以提高滚动的性能，但即使在网上搜索了很多并尝试了几件事后也不知道该怎么做。

如果有人可以修改以下代码或仅指出以下代码中需要更改的内容，我遇到过使单元格不透明和/或将表格视图设置为子视图以大大提高滚动性能。 我的代码如下。

// cell is created for each row of track.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    NSLog(@"tableView cellForRowAtIndexPath");


    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    [CellIdentifier release];
    cell.accessoryView = nil;

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

     /** saving the data in Book structure.**/
     Book *aBook = [appDelegate.books objectAtIndex:indexPath.row];

     [cell.textLabel setText: aBook.name];

    // indexrow refers to each cell 
    temp =[appDelegate.tracklocation intValue];
    requesttemp =[appDelegate.requestlocation intValue];        

    // Coloring Code starts
    // indexPath starts from 0th cell that is why it is incremented by 1
    if(temp==(indexPath.row+1))
    { 
        NSLog(@"value of temp inside if is = %d",temp);
        NSLog(@"value of indexrow inside if is=%d",(indexPath.row+1));
        UIImageView *imageView1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"speaker.png"]];
        imageView1.backgroundColor = [ UIColor greenColor ];
        cell.contentView.backgroundColor = [ UIColor greenColor ];
        [cell.textLabel setBackgroundColor:[UIColor greenColor]];
        [cell.textLabel setTextColor:[UIColor blackColor]];
        [cell.detailTextLabel setBackgroundColor:[UIColor greenColor] ];
        [cell.detailTextLabel setTextColor:[UIColor blackColor] ];
        cell.accessoryView = imageView1;
        [imageView1 release];
    }
    else 
    {
        cell.contentView.backgroundColor = [ UIColor whiteColor ];
        [cell.textLabel setBackgroundColor:[UIColor whiteColor] ];
        [cell.textLabel setTextColor:[UIColor blackColor ]];
        [cell.detailTextLabel setBackgroundColor:[UIColor whiteColor]];
        [cell.detailTextLabel setTextColor:[UIColor grayColor] ];
    }

        while(requesttemp>temp)
        { 
            if (requesttemp==(indexPath.row+1))
            {
                if (colorflag==1)
                {
                    NSLog(@"value of request temp inside while is = %d",requesttemp);
                    NSLog(@"value of indexrow inside while is=%d",(indexPath.row+1));
                    cell.contentView.backgroundColor = [ UIColor blueColor ];
                    [cell.textLabel setBackgroundColor:[UIColor blueColor ]];
                    [cell.textLabel setTextColor:[UIColor whiteColor ]];
                    [cell.detailTextLabel setBackgroundColor:[UIColor blueColor] ];
                    [cell.detailTextLabel setTextColor:[UIColor whiteColor] ];
                }
            }
            requesttemp=requesttemp-1;
        }
    }    

    cell.detailTextLabel.text = abook.artist;

    cell.detailTextLabel.numberOfLines = 1;

     cell.detailTextLabel.lineBreakMode = UILineBreakModeWordWrap;
     NSLog(@"RootViewController cellForRowAtIndexPath %@ ",cell);

     return cell;
}

Answer 1

[cellIdentifier 发布] ?? 你不释放静电！ 您的单元重用可能因此而失败。

UITableViewCell 分配也没有自动释放。这应该会导致大量泄漏，并最终导致应用程序变慢/崩溃。

这是泄漏+单元重用失败的致命组合

希望对你有帮助