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iphone - Select all the cells in UITableView

what would be the best method to select all the cells in the table(UITableView) when the user presses a button in the tool bar?

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

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

    }
}

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