Ios Xcode Message from debugger: Terminated due to memory issue

Question

I have an app with collection view and a cell within this collection view that redirects to external link.

Whenever that link opens the app crashs in the background and gives on the debugger:

"Terminated due to memory issue".

If I just press home button the app continues working just fine.

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

What device is this happening on? Once your app is in the background you can expect for it to be killed at any time - it doesn't have to be using excessive memory.

If the new foreground app wants more memory, the OS will give it as much as it can. It will send a memory warning to any backgrounded apps. If they don't respond by reducing the memory footprint, or the foreground app still wants more memory, then the background apps are killed.

Your app isn't crashing, it is being killed by the OS because it is no longer the foreground app and its resources are needed elsewhere.