Update UITableView titleForFooterInSection for UISlider's valueChanged?

Question

I have a UITableViewCell which has a UISlider in it. I have a footer text for the tableview that I would like to update with the value of the UISlider.

However, calling [self.tableView reloadData]; does not work for the UISlider, as it is too many calls. I am able to update the cell correctly (it also shows the value), but I am unable to update the footer text. I have tried:

[self tableView:self.tableView titleForFooterInSection:0];

But it doesn't work..

Answer 1

Connect your slider to an action method in your controller:

[theSlider addTarget: self action: @selector(adjustSliderValue:) forControlEvents: UIControlEventValueChanged];

Implement the slider action method:

- (void) adjustSliderValue: (UISlider *) slider
{
    // Change controller's state here. The next line will trigger -tableView:titleForFooterInSection:
    [self.tableView reloadSections: [NSIndexSet indexSetWithIndex: mySectionIndex] withRowAnimation: UITableViewRowAnimationNone];
}

This is more efficient than reloading the whole table. Unfortunately, there is no way to set a section footer text directly.