UITableView SelectAll - willDeselectRowAtIndexPath alternative

I built a multi-selection table, I did that using willSelectRowAtIndexPath and willDeselectRowAtIndexPath. It is working fine. Now I want to programatically selectALL or Select None. Is there a way to call

[tableView selectRowAtIndexPath: [NSIndexPath indexPathForRow:i inSection:0] animated:NO scrollPosition:UITableViewScrollPositionNone];

without having the currently selected row unselected? I read in documentation, this method does not call delegate's willDeselectRowAtIndexPath.

Here's all code to allow multiple selection. The problem is now that I cannot select programmatically without deselecting previous.

- (NSIndexPath *)tableView:(UITableView *)aTableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath{

    NSDictionary* friend = [friendsData objectAtIndex:[indexPath row]]; 
    if (![selectedIndexes containsObject:friend]) {
        [selectedIndexes addObject:friend];

    } 
    else {
        [selectedIndexes removeObject:friend];
        [tab开发者_JAVA百科leView deselectRowAtIndexPath:indexPath animated:NO];
        return nil;
    }
    return indexPath;
}


- (NSIndexPath *)tableView:(UITableView *)tableView willDeselectRowAtIndexPath:(NSIndexPath *)indexPath{
    NSDictionary* friend = [friendsData objectAtIndex:[indexPath row]]; 
    if (![selectedIndexes containsObject:friend]) {
         return indexPath;
     }
    // do not select so we can have multiple select
    return nil;
}

You'll have to change your data source to reflect the select all or select none, then refresh the rows in question to update them to their new status.

I can't post any specific code because it really depends on how you've set up your multi-selection.

Edit

It seems that you can select all by setting selectedIndexes to friendsData and select none by clearing the contents of selectedIndexes.

Select All:

[selectedIndexes setArray: friendsData];

Select None:

[selectedIndexes removeAllObjects];

Then you can reload your table view. If you want it to be instant, execute [tableView reloadData] otherwise you can use the reload methods with animation.

Here is method to traverse a table, it works well.

Select all the cells in UITableView

for (int i = 0; i < [ptableView numberOfSections]; i++) {
for (int j = 0; j < [ptableView numberOfRowsInSection:i]; j++) {
    NSUInteger ints[2] = {i,j};
    NSIndexPath *indexPath = [NSIndexPath indexPathWithIndexes:ints length:2];
        UITableViewCell *cell = [ptableView cellForRowAtIndexPath:indexPath];
       //Here is your code

  }
 }