Graphics Programs Reference
In-Depth Information
UITableViewDataSource
protocol. (This message is sent to the
ItemsViewCon-
troller
. Keep in mind that while the
BNRItemStore
is the where the data is kept,
the
ItemsViewController
is the table view's “data source.”)
When
tableView:commitEditingStyle:forRowAtIndexPath:
is sent to the
data source, two extra arguments are passed along with it. The first is the
UIT-
ableViewCellEditingStyle
, which, in this case, is
UITableViewCellEdit-
ingStyleDelete
. The other argument is the
NSIndexPath
of the row in the table.
In
ItemsViewController.m
, implement this method to have the
BNRItemStore
remove the right object and to confirm the row deletion by sending the message
de-
leteRowsAtIndexPaths:withRowAnimation:
back to the table view.
- (void)tableView:(UITableView *)tableView
commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
forRowAtIndexPath:(NSIndexPath *)indexPath
{
// If the table view is asking to commit a delete command...
if (editingStyle == UITableViewCellEditingStyleDelete)
{
BNRItemStore *ps = [BNRItemStore sharedStore];
NSArray *items = [ps allItems];
BNRItem *p = [items objectAtIndex:[indexPath row]];
[ps removeItem:p];
// We also remove that row from the table view with an animation
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationFade];
}
}
Build and run your application, create some rows, and then delete a row. It will disappear.
Try out some of the different row animations!
