Question

谁能帮我找到内存分配和泄漏？

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{       
    NSInteger rowIndex = [indexPath row];//row index    
    static NSString *NineCellIdentifier = @"NineCellIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:NineCellIdentifier];   
    if (cell == nil) 
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:NineCellIdentifier] autorelease];
    }

NSNumber* aHeight = [heightArray objectAtIndex:rowIndex];
itemHeight = [aHeight integerValue];

NSInteger index = 0;
for (int j=0; j< columnNum; j++) 
{
    CGFloat x, y, w, h;
    x = 0;
    y = 0;
    w = itemWidth;
    h = itemHeight;

    index = rowIndex*columnNum + j;
    if (index >= [itemList count]) 
    {
        break;
    }
    //NSLog(@"index = %d, j= %d", index, j);
    curItem = [itemList objectAtIndex:index];
    NSString *imageFile = [appDelegate.clientResourcesDir stringByAppendingPathComponent:curItem.pic];
    UIImage *image = [UIImage imageWithContentsOfFile:imageFile];
    NSInteger imageWidth = image.size.width;
    NSInteger imageHeight = image.size.height;
    if (imageWidth > itemWidth) 
    {
        imageHeight = imageHeight*itemWidth/imageWidth;
        imageWidth = itemWidth;
    }       

    UIButton *itemBtn = [[UIButton alloc] initWithFrame:CGRectMake(x, y, w, h)];
    [itemBtn setBackgroundColor:[UIColor clearColor]];
    [itemBtn setTag:index];
    [itemBtn addTarget:self action:@selector(goNextPageView:) forControlEvents:UIControlEventTouchUpInside];

    if ([curItem.text1 isEqualToString:@""])
    {
        x = itemBtn.frame.origin.x + (itemWidth - imageWidth)/2;
        y = itemBtn.frame.origin.y + (itemHeight - imageHeight)/2;
    }
    else
    {
        x = itemBtn.frame.origin.x + (itemWidth - imageWidth)/2;
        y = itemBtn.frame.origin.y + (itemHeight - imageHeight - textSize - blankSize)/2;
    }       

    //1 button
    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(x, y, imageWidth, imageHeight)];
    [button setBackgroundImage:image forState:UIControlStateNormal];
    [button setTag:index];
    [button addTarget:self action:@selector(goNextPageView:) forControlEvents:UIControlEventTouchUpInside];
    [itemBtn addSubview:button];
    [button release];

    //2 label
    x = 0;
    y = y + imageHeight + blankSize; 
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(x, y, itemWidth, textSize)];
    label.font = [UIFont boldSystemFontOfSize:textSize];
    [label setTextAlignment:UITextAlignmentCenter];
    [label setBackgroundColor:[UIColor clearColor]];        
    label.textColor = [UIColor colorWithRed:rf green:gf blue:bf alpha:1];
    label.lineBreakMode = UILineBreakModeWordWrap;
    label.text = curItem.text1;
    label.tag = -1;     
    [itemBtn addSubview:label];
    [label release];

    //itemBtn.contentMode = UIViewContentModeBottom;
    CGRect frame = itemBtn.frame;
    frame.origin.x = j * itemWidth;
    frame.origin.y = 0;
    itemBtn.frame = frame;

    [cell addSubview:itemBtn];      
    [itemBtn release];
}
return cell;
}

Answer 1

curItem具有保留属性

除此之外，我在这段代码中看不到任何泄漏。泄漏可能在别的地方。

Answer 2

也许我错过了一些东西，但我看不到任何技术上被认为是漏洞的东西。我能看到的唯一问题是，每次绘制单元格时都会添加所有按钮，因此最终会出现大量标签和按钮，并且内存可能会耗尽。您可以通过每次删除所有子视图来解决此问题。执行此操作时，您可能希望将按钮添加到cell.contentView而不是仅添加到单元格，否则您最终可能会删除您不想要的视图。

Answer 3

itemBtn正在泄露。要弄清楚它为什么会发生，你应该了解UITableView的工作原理。当它将细胞从当前不可见的单元格中取出时，它会添加itemBtn，即使它已被添加。

你应该继承UITableViewCell并在init方法中添加itemBtn。在tableView：cellForRowAtIndexPath中：您应该只设置一些属性，不要在单元格上添加任何子视图。

谁能帮我找到内存分配和泄漏？

3 个答案: