CODEWITHSUNDEEP
imageuitableviewmemory-leaksautomatic-ref-counting
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Reputation: 139

Release memory used for UITableView.cell.image after leaving UIViewController

I have a UIViewController with UITableViewDelegate, UITableViewDataSource, NSFetchedResultsControllerDelegate protocols. The UIViewController contains UITableView where I load some data from Core Data. The loaded data include name, subtitle and an image. They are set like:

cell.textLabel.text = [NSString stringWithFormat:@"%@", artist.title];
cell.detailTextLabel.text = [NSString stringWithFormat:@"%@ year", artist.year];
NSString *fileName = [NSString stringWithFormat: @"%@/%@", [[NSBundle mainBundle] resourcePath], artist.imageSmall];
cell.imageView.image = [UIImage imageWithContentsOfFile:fileName];

As I figured out before, [UIImage imageNamed:] caches the image which causes memory leaks. That's why I applied imageWithContentsOfFile method in code, where I needed to load big-size images. And it worked great. But it doesn't seem to work fine within my UITableView. Or I do smth wrong of cause :)

Here my images are not so heavy, they're like 20-40kb per image. It's ok even if I load 50 images per UITableView. It takes about 5Mb of memory to show, for example, 50 artists' photos per category. But what I noticed is that when I leave my ViewController and load it again via another indexPath (I open some other category cell and going to view the artists from that category) the memory used by app continues to increase. If I browse through 20 categories, then I get 100Mb memory usage. It doesn't look like the ARC work fine here.

So, how can I release the memory or destroy UITableView after moving back from my UIViewController?

Upvotes: 0

Views: 2427

Answers (1)

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Reputation: 139

2 hours later I found solution %)

I figured out to declare UITableView as (weak, nonatomic) instead of (strong, nonatomic). And in ViewDidDisappear method I call 

[self.tableView removeFromSuperview];

and memory releases successfully.

Upvotes: 2

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