CODEWITHSUNDEEP
iosuitableviewcocoa-touchuikitdidreceivememorywarning
Martin Berger
Martin Berger

Reputation: 1708

iOS UITableView loose content after "received memory warning" message

(originally i posted this on Apple Developer Network and got no response in four days, so i am copy/pasting here)

ARC is enabled.

In my class i have an UITableViewController property,

@property (nonatomic, strong) UITableViewController* tableViewControllerSectionMenu;

which is used to hold table view for UIPopoverController.

This code creates UITableViewController and sets delagate and data source in viewDidLoad:

self.tableViewControllerSectionMenu = [[UITableViewController alloc] initWithStyle:UITableViewStylePlain];
self.tableViewControllerSectionMenu.tableView.dataSource = self.dataSource;
self.tableViewControllerSectionMenu.tableView.delegate = self;

This works fine until memory warning occur.

After that the table is blank.

I tried putting reloadData at place where popover is invoked but that changes nothing.

Does somebody know why this is happening and how to remedy this?

By googling i have found several solutions and none have worked in my case.

Upvotes: 1

Views: 748

Answers (2)

Martin Berger
Martin Berger

Reputation: 1708

When memory warning message is received, all views not currently visible on screen are purged. They are supposed to be recreated later when needed.

To recreate them means also to attach delegate and data source again. Since memory warning was received while in ViewController X, and it's view was on screen, my table view got purged.

But as i wasn't moving from X, delegate and data source were not attached again, as that was done in viewDidLoad.

To evade getting back one step from X, i created a new class for my table view where in viewDidLoad i attached delegate and data source.

Upvotes: 0

Tom van Zummeren
Tom van Zummeren

Reputation: 9220

I think your data is cleaned when the memory warning is received. Did you implement either didReceiveMemoryWarning or viewDidUnload by any chance?

Upvotes: 1

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