Deleting rows in uitableview - iphone

Question

I am Having an application where, if the user enters data the rows will be updated with that data
Can i use One Single Button say 'delete' which when clicked will delete all the rows in the tableview at once.?

Answer 1

Yes you can do that. First remove all data from your data source, then reload your table. For ex. -
[yourArrayDataSource removeAllObjects];
[yourTable reloadData];
To animate the deletion of rows - do this in an IBAction method & link it to your UIButton. As soon as you press the button you will have a smooth awesome animation making all your rows fade out.
-(IBAction)deleteRows
{
[yourTable beginUpdates];
for(int i=0; i<[yourArrayDataSource count]; i++)
{
indexPath = [NSIndexPath indexPathForRow:i inSection:0];
[self.searchResTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
[yourTable endUpdates];
}
There are various animations that you can use here-
UITableViewRowAnimationBottom
UITableViewRowAnimationFade
UITableViewRowAnimationMiddle
UITableViewRowAnimationNone
UITableViewRowAnimationRight
UITableViewRowAnimationTop

Answer 2

make a button and in the button action method
-(IBAction)deleteRows
{
[array removeAllObjects];
[tableview reloadData];
}

Answer 3

Srikar's answer put me on the right track, but creates a lot of extra single item arrays, and calls deleteRowsAtIndexPaths far more than is needed.
-(void)clearTable
{
NSMutableArray *indexPaths = [NSMutableArray array];
for(int i=0; i<[self.myArray count]; i++)
{
NSIndexPath *anIndexPath = [NSIndexPath indexPathForRow:i inSection:0];
[indexPaths addObject:anIndexPath];
}
[self.myTableView beginUpdates];
[self.myTableView deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];
self.myArray = [NSArray array];
[self.myTableView endUpdates];
}