从明细视图控制器返回后，在嵌入式TableView单元格中停止activityIndi​​cator

Question

I have a viewController that has a container view. In the container view I have a tableView that contains static cells. Each cell has a disclosure indicator. This was all created in IB. The parent viewController is embedded in a navigationController.

Each cell pushes a new view controller which loads a mapView. Each map parses and loads a .kml file. The .kml files are huge and take up to a minute (or more) to load.

I placed an activityIndicator in the accessory view of each cell using the following code:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

UIActivityIndicatorView *activityView =
[[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
[activityView startAnimating];
[cell setAccessoryView:activityView];

[self.tableView deselectRowAtIndexPath:[self.tableView indexPathForSelectedRow] animated:YES];}

This appears to work as expected.

After viewing the map I touch the "back" button provided by the navigationController and pop the map off the stack. My embedded tableView is visible again, with the activity indicator still spinning. I can't get it to stop.

My best attempt was in the implementation file of my tableView:

- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[[self tableView] reloadData];}

But that didn't work. Any suggestions?

Answer 1

Calling reloadData in the table view controller's viewWillAppear would work as long as in the cellForRowAtIndexPath method, you're setting the state for UIActivityIndicatorView by calling it's stopAnimating method (or simply remove it from the view) for any cell that shouldn't be spinning.

You'll need to reference the activity indicator via the accesstoryView property.

In your data, you could store a property that indicates whether the indicator should still be spinning for that map and set it appropriately.

Another method would be to stop the activity indicator in prepareForSegue , just prior to showing the map view.