how to clear all the rows of uitableview

Question

I added a button on the uinavigationbar I want to use it to clear all the rows of uitablview

How can I do that?

Answer 1

A bit late... but try this:

Where you want to clear the table:

// clear table
clearTable = YES;
[table reloadData];
clearTable = NO;

This function should look like:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    if(clearTable)
        return 0;

    (...)
}

Answer 2

Before you are reloading the table remove all objects from your tableView array (The array which populated your tableView) like so:

[myArray removeAllObjects];
[tableView reloadData];

Answer 3

The crash is occurring because you need to reset number if rows count in the -

-(NSInteger)tableView:(UITableView *)tableView 
 numberOfRowsInSection:(NSInteger)section
{
    return [tempArray count];
}

one way is use a flag variable as below:

-(NSInteger)tableView:(UITableView *)tableView 
 numberOfRowsInSection:(NSInteger)section
{
   if (deleting)
      return rowcount;
   else
       return [tempArray count];
}

Also you need to modify the deleting code as below:

    deleting = YES;
    for (i = [uiTable numberOfRowsInSection:0] - 1; i >=0 ; i--)
    { 
    NSIndexPath *index = [NSIndexPath indexPathForRow:i inSection:0]; 
    [uiTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:index] withRowAnimation:UITableViewRowAnimationFade]; 

     rowcount = i;
    } 

    deleting = NO;
    [uiTable reloadData];

in your .h file

BOOL deleting;
NSInteger  rowcount;

Hope this helps...

Answer 4

Simple.. set your data source (NSArray or NSDictionary) to nil and [self.tableView reloadData]!

Answer 5

What do you exactly mean by clearing the row? Do you still want them to be there, but without text? If yes, here's this code:

   UITableViewCell *cell;

    NSIndexPath *index;

        for (int i = 0 ; i < count; i++) {
            index = [NSIndexPath indexPathForRow:i inSection:0];
            cell = [tableView cellForRowAtIndexPath:index];
            cell.textLabel.text = @"";
        }

If you want to delete them, you can use this code:

[uiTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:index] withRowAnimation:UITableViewRowAnimationFade];

Answer 6

The rowcount = i should go before the call.

[uiTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:index]
withRowAnimation:UITableViewRowAnimationFade];

Otherwise, it will crash.