iphone - select multiple rows from uitableview and delete

Question

i am displaying a list of items in a tableview.i need to select and delete multiple rows from the table at a time,any resources on how to do this

Answer 1

I'm assuming your table has just one section. You can extend this solution to multiple sections fairly easily.

• Add an NSMutableSet member "selectedRows" to your UIViewController subclass that manages your TableView
• in - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath toggle the indexPath.row's membership in "selectedRows", like this:

NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:indexPath.row];
if ( [self.selectedRows containsObject:rowNsNum] )
    [self.selectedRows removeObject:rowNsNum];
else 
    [self.selectedRows addObject:rowNsNum];

• indicate visually that a row is selected (e.g., set the cell's accessoryType property to UITableViewCellAccessoryCheckmark), or modify your cell visually in some other way to indicate that it is a selected row
• add a "delete" button to your UI, either in a table section header/footer, your title bar, anywhere, hooked up to a selector called "deleteRows"
• in your deleteRows method, iterate through the selectedRows set, building up an array of indexPaths, delete these rows from your data model, then call (with your preferred animation type):

[self.myTableView deleteRowsAtIndexPaths:arrayOfIndexPathsToDelete withRowAnimation:UITableViewRowAnimationTop];    

EDIT: Here's my full didSelectRowAtIndexPath method. The deselectRowAtIndexPath may be required for correct operation.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{
    if ( self.editing )
        return;

    [self.myTableView deselectRowAtIndexPath:indexPath animated:YES];

    NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:indexPath.row];
    if ( [self.selectedRows containsObject:rowNsNum] )
        [self.selectedRows removeObject:rowNsNum];
    else 
        [self.selectedRows addObject:rowNsNum];

    [self.myTableView performSelector:@selector(reloadData) withObject:nil afterDelay:0.2];
}