Question

我有一个工作正常的应用程序。但我需要内存泄漏免费。所以我决定使用分析器构建，然后我看到了很多小的内存管理问题。我除了这个以外几乎所有的东西都整理好了。单元格对象显示为泄漏的对象，但实际上我不知道我错在哪里。这是我的cellforRowatIndexpath方法。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:EventCellIdentifier];


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

        UIImageView* img = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"cell_with_arrow.png"]];
        [cell setBackgroundView:img];
        [img release];    

        cell.textLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:13.0];
        cell.textLabel.lineBreakMode = UILineBreakModeWordWrap; // Pre-iOS6 use UILineBreakModeWordWrap
        cell.textLabel.numberOfLines =0; 
        [cell.textLabel sizeToFit];


    }


     [[cell viewWithTag:12] removeFromSuperview];
    [[cell viewWithTag:13] removeFromSuperview];

    PTPusherEvent *event = [eventsReceived objectAtIndex:indexPath.row];







    //cell.textLabel.text = event.name;
    // cell.detailTextLabel.text = [event.data description];

    NSDictionary *payload =event.data;
    NSLog(@"%@",payload);
    NSString *tes=[payload objectForKey:@"from"];
    NSString *subtitle = [NSString stringWithString: @"From "];
    subtitle = [subtitle stringByAppendingFormat:@"%@",tes];










    cell.detailTextLabel.text = subtitle;
    cell.textLabel.text = [payload objectForKey:@"message"];

    cell.textLabel.backgroundColor = [UIColor clearColor];
    cell.detailTextLabel.backgroundColor = [UIColor clearColor]; 



    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    // [dateFormat setDateFormat:@"dd-MMM-YYYY HH:mm:ss"];
    [dateFormat setDateFormat:@"dd-MMM-YYYY hh:mm a"];
    [dateFormat setTimeZone:[NSTimeZone defaultTimeZone]]; 
    NSDate *todaysdate=[NSDate date];
    NSString *todaysdateString = [dateFormat stringFromDate:todaysdate];
    [dateFormat release];

    CGSize boundingSize = CGSizeMake(320, CGFLOAT_MAX);
    CGSize requiredSize = [cell.textLabel.text sizeWithFont:cell.textLabel.font
                                          constrainedToSize:boundingSize
                                              lineBreakMode:UILineBreakModeWordWrap];
    CGFloat requiredHeight = requiredSize.height;  


    MarqueeLabel *rateLabelOne =  [[MarqueeLabel alloc] initWithFrame:CGRectMake(115, requiredHeight+15,155, 20) rate:50.0f andFadeLength:10.0f];    
    rateLabelOne.numberOfLines = 1;
    rateLabelOne.marqueeType = MLContinuous;
    rateLabelOne.opaque = NO;
    rateLabelOne.enabled = YES;
    rateLabelOne.shadowOffset = CGSizeMake(0.0, -1.0);
    rateLabelOne.textAlignment = UITextAlignmentRight;
    rateLabelOne.textColor = [UIColor redColor];
    rateLabelOne.backgroundColor = [UIColor clearColor];
    rateLabelOne.font = [UIFont fontWithName:@"Helvetica-Bold" size:12.000];
    rateLabelOne.text = @"OFFline!cannot communicate now.....";

    MarqueeLabel *rateLabelTwo = [[MarqueeLabel alloc] initWithFrame:CGRectMake(215, requiredHeight+15,100, 20) rate:50.0f andFadeLength:10.0f];
    rateLabelTwo.marqueeType = MLContinuous;
    rateLabelTwo.numberOfLines = 1;
    rateLabelTwo.opaque = NO;
    rateLabelTwo.enabled = YES;
    rateLabelTwo.shadowOffset = CGSizeMake(0.0, -1.0);
    rateLabelTwo.textAlignment = UITextAlignmentRight;
    rateLabelTwo.textColor = [UIColor blueColor];
    rateLabelTwo.backgroundColor = [UIColor clearColor];
    rateLabelTwo.font = [UIFont fontWithName:@"Helvetica" size:12.000];
    rateLabelTwo.text = todaysdateString;

    if([chatstatus isEqualToString:@"online"])
    {

        rateLabelTwo.tag=12;

        [cell addSubview:rateLabelTwo];
        [rateLabelTwo release];



    }
    else
    {
        rateLabelOne.tag=13;

        [cell addSubview:rateLabelOne];
        [rateLabelOne release];



    }


return cell;
}

有人能帮助我找出那个怪物在哪里吗？

Answer 1

您需要将autorelease设为

cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:EventCellIdentifier] autorelease];

否则会泄露。

<强>更新

如AppleDelegate所述，

[rateLabelTwo release];和[rateLabelOne release];也需要移出if条件，以便在if和else个案例中释放。分析仪也会将此检测为泄漏。

Answer 2

好的，这就是问题所在......

 if([chatstatus isEqualToString:@"online"])
    {

        rateLabelTwo.tag=12;

        [cell addSubview:rateLabelTwo];
        [rateLabelTwo release];



    }
    else
    {
        rateLabelOne.tag=13;

        [cell addSubview:rateLabelOne];
        [rateLabelOne release];



    }

在您的代码中，rateLabelOne和rateLabelTow在if循环中释放。静态分析器将其分析为泄漏，因为它假定可能存在代码无法运行的情况在if循环内部。实际上它不是泄漏。

Answer 3

使用此行：

cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:EventCellIdentifier]autorelease];

这将消除您的内存泄漏。

Answer 4

    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:EventCellIdentifier]autoRelease];

内存泄漏出现在分析仪中的tableview单元格中？

4 个答案: