来自调试器的 Ios Xcode 消息：由于内存问题而终止

Question

我有一个带有集合视图的应用程序和这个集合视图中的一个重定向到外部链接的单元格。

每当该链接打开应用程序在后台崩溃并在调试器上给出：

“由于内存问题而终止”。

如果我只是按下主页按钮，应用程序将继续正常工作。

if (UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation)) Portrait = NO;
else if (UIDeviceOrientationIsPortrait([UIDevice currentDevice].orientation)) Portrait = YES;
else Portrait = [self getStatusBarOrientations];

if(indexPath.row == 4 && indexPath.section == 0)
{
    NewsListCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell4"  forIndexPath:indexPath];

    if ([languageID isEqualToString:@"1025"])
    {
        cell.title.text =[NSString stringWithFormat:@"جريدة اليوم %@", [self.pdfCoverDict valueForKey:@"PdfDate"]];
        [cell.contentView setTransform:CGAffineTransformMakeScale(-1, 1)];
    } else {
        cell.title.text =[NSString stringWithFormat:@"Today's Edition %@", [self.pdfCoverDict valueForKey:@"PdfDate"]];
    }
    NSURL *imageUrl = [NSURL URLWithString:[self.pdfCoverDict valueForKey:@"CoverImage"]];
    [cell.imageView sd_setImageWithURL:imageUrl];
    cell.imageViewWidth.constant = Portrait ? 246 : 331;
    cell.imageViewHeight.constant = Portrait ? 350 : 471;
    return cell;

} else if(indexPath.row == 0) {
    NewsListCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"HeaderView" forIndexPath:indexPath];
    cell.title.text = [self.channelKeys objectAtIndex:indexPath.section];
    cell.backView.hidden = [channelID isEqualToString:@"1"] ? (indexPath.section == 0 ? YES : NO) : YES;
    if([languageID isEqualToString:@"1025"]) {
        [cell.contentView setTransform:CGAffineTransformMakeScale(-1, 1)];
    } else {
        [cell.contentView setTransform:CGAffineTransformMakeScale(-1, 1)];
        [cell.title setTransform:CGAffineTransformMakeScale(-1, 1)];
    }
    return cell;
} else {

    NSInteger row;
    if(indexPath.row != 1 && indexPath.row != 2 && indexPath.row != 3) {
        row = indexPath.row - 2;
    } else {
        row = indexPath.row - 1;
    }
    NSMutableArray * articles =  [self.channelArticles valueForKey:[self.channelKeys objectAtIndex:indexPath.section]];
     //        if(row < articles.count) {
    NSString *articleImage = [[articles objectAtIndex:row] valueForKey:@"ArticleMedia"];
    NSString *cellIdentifier;
    NSString *articleLangID = [NSString stringWithFormat:@"%@", [[articles objectAtIndex:row] valueForKey:@"LanguageID"]];

    if(indexPath.section == 0) {
        switch (indexPath.row)
        {
            case 1:
                if(![articleImage isEqualToString:@""]) cellIdentifier = @"Cell1";
                else cellIdentifier = @"CellNoImg";
                break;
            case 2:
                if(![articleImage isEqualToString:@""]) cellIdentifier = @"Cell2";
                else cellIdentifier = @"CellNoImg";
                break;
            case 3:
                if(![articleImage isEqualToString:@""]) cellIdentifier = @"Cell3";
                else cellIdentifier = @"CellNoImg";
                break;
            case 5:
                if(![articleImage isEqualToString:@""]) cellIdentifier = @"Cell5";
                else cellIdentifier = @"CellNoImg";
                break;
            case 6:
                if(![articleImage isEqualToString:@""]) cellIdentifier = @"Cell5";
                else cellIdentifier = @"CellNoImg";
                break;
            default:
                if(![articleImage isEqualToString:@""]) {
                    if([channelID isEqualToString:@"1"]) cellIdentifier = @"Cell6";
                    else cellIdentifier = @"Cell5";
                } else {
                    cellIdentifier = @"CellNoImg";
                }
                break;
        }
    } else {
        if(![articleImage isEqualToString:@""]) cellIdentifier = @"Cell5";
        else cellIdentifier = @"CellNoImg";
    }


    NewsListCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];

    if([[[articles objectAtIndex:row] valueForKey:@"LabelName"] isEqualToString:@""]) {
        cell.labelNameHeight.constant = 0;
    } else {
        cell.labelNameHeight.constant = 21;
    }
    cell.labelName.text = [[articles objectAtIndex:row] valueForKey:@"LabelName"];

    cell.title.text = [[articles objectAtIndex:row] valueForKey:@"MainHeadline"];

    if(indexPath.row == 3 && indexPath.section == 0) {
        if(![articleImage isEqualToString:@""]) cell.titleHeight.constant = [self lineCountForLabel:cell.title labelWidth:cell.frame.size.width - Portrait ? 254 : 337] * 35;
        else cell.titleHeight.constant = [self lineCountForLabel:cell.title labelWidth:cell.frame.size.width - 10] * 35;
    } else {
        cell.titleHeight.constant = [self lineCountForLabel:cell.title labelWidth:cell.frame.size.width - 10] * 35;
    }

    NSString *authorTime = [self getAuthorTime:[articles objectAtIndex:row]];
    if([authorTime isEqualToString:@""]) {
        cell.authorTimeHeight.constant = 0;
    } else {
        cell.authorTimeHeight.constant = 21;
    }
    cell.authorTime.text = authorTime;

    NSString *details = [[articles objectAtIndex:row] valueForKey:@"Introduction"];
    cell.details.attributedText = [self getAttributedString: details language: articleLangID];

    if([cellIdentifier isEqualToString:@"CellNoImg"]) {
        defaultLines = 5;
        if([cell.authorTime.text isEqualToString:@""]) defaultLines++;
        if([cell.labelName.text isEqualToString:@""]) defaultLines++;
        if(cell.titleHeight.constant / 35 == 1) defaultLines++;
        cell.details.numberOfLines = defaultLines;
    }

    if(indexPath.section == 0) {
        switch (indexPath.row)
        {
            case 2:
                cell.imageViewWidth.constant = Portrait ? 240 : 323;
                cell.imageViewHeight.constant = Portrait ? 151 : 199;
                break;
            case 3:
                cell.imageViewWidth.constant = Portrait ? 240 : 323;
                cell.imageViewHeight.constant = Portrait ? 151 : 199;
            case 5:
                cell.imageViewWidth.constant = Portrait ? 240 : 323;
                cell.imageViewHeight.constant = Portrait ? 151 : 199;
                break;
            case 6:
                cell.imageViewWidth.constant = Portrait ? 240 : 323;
                cell.imageViewHeight.constant = Portrait ? 151 : 199;
                break;
            default:
                cell.imageViewWidth.constant = Portrait ? 240 : 323;
                cell.imageViewHeight.constant = Portrait ? 151 : 199;
                break;
        }
    } else {
        cell.imageViewWidth.constant = Portrait ? 240 : 323;
        cell.imageViewHeight.constant = Portrait ? 151 : 199;
    }

    if (![articleImage isEqualToString:@""]) {
        NSURL *imageUrl = [NSURL URLWithString:articleImage];
        [cell.imageView sd_setImageWithURL:imageUrl];

    } else {
        [cell.imageView sd_setImageWithURL:nil];
    }

    if([articleLangID isEqualToString:@"1025"]) {
        [cell.contentView setTransform:CGAffineTransformMakeScale(-1, 1)];
        cell.labelName.textAlignment = NSTextAlignmentRight;
        cell.title.textAlignment = NSTextAlignmentRight;
        cell.authorTime.textAlignment = NSTextAlignmentRight;
        cell.details.textAlignment = NSTextAlignmentRight;
    } else {
        if (indexPath.row == 3) {
            [cell.contentView setTransform:CGAffineTransformMakeScale(-1, 1)];
            [cell.labelName setTransform:CGAffineTransformMakeScale(-1, 1)];
            [cell.title setTransform:CGAffineTransformMakeScale(-1, 1)];
            [cell.authorTime setTransform:CGAffineTransformMakeScale(-1, 1)];
            [cell.details setTransform:CGAffineTransformMakeScale(-1, 1)];
            [cell.imageView setTransform:CGAffineTransformMakeScale(-1, 1)];
        }
        cell.labelName.textAlignment = NSTextAlignmentLeft;
        cell.title.textAlignment = NSTextAlignmentLeft;
        cell.authorTime.textAlignment = NSTextAlignmentLeft;
        cell.details.textAlignment = NSTextAlignmentLeft;
    }
    return cell;

}

}

Answer 1

这发生在什么设备上？一旦您的应用程序处于后台，您就可以期待它随时被终止 - 它不必使用过多的内存。

如果新的前台应用程序需要更多内存，操作系统会尽可能多地提供。它将向任何后台应用程序发送内存警告。如果它们没有通过减少内存占用来做出响应，或者前台应用仍然需要更多内存，那么后台应用就会被杀死。

您的应用程序没有崩溃，它被操作系统杀死了，因为它不再是前台应用程序，并且它的资源在其他地方需要。

Answer 2

我有同样的问题 - 当内存使用率仍然很低时，由于内存问题而终止。

然后我找到了原因：其实内存分配的很快。

只是因为内存被破坏得很快，所以看起来内存使用率还是很低的。 您可以使用工具查看当前内存使用情况/总内存使用情况 picture to explain how view memory usage / total memory usage 图片是从网上找到的，但是把问题解释清楚了。 你会发现这个值在快速减少，浅色区域快速增长，然后你的应用程序在内存使用率仍然很低的情况下由于内存问题而崩溃。

Answer 3

我会检查您代码中的其他地方。答案很可能是您在某处有一个保留周期并且正在泄漏内存。搜索诸如闭包之类的项目，您可能忽略了将 self 声明为弱（可能为 nil）或无主（在该实例中从不为 nil，但 self 不属于闭包对象）

[weak self]

或

[unowned self]

仪器可以帮助您，但需要对正在使用的对象（控制器、自定义视图类、自定义 tableviewcell 子类、可能引用 self 的 tableviewrowaction 委托方法等）进行详细检查。当您找到可疑区域并进行更正后，您应该测试设备上的行为，看看您是否可以发现仪器中的泄漏。

验证您的修复是否消除了泄漏，进行更多测试并确认没有发生其他泄漏（很可能不止一个）。

Answer 4

如果此问题仅在应用未处于活动状态时出现，那么它也可能是由测试设备上的其他（内存不足的）应用引起的。要排除这种情况，请禁用其他应用的后台应用刷新和/或关闭其他应用和/或重新启动设备。