Change UITableView section header/footer WHILE RUNNING the app?

Question

I\'m facing a problem I cannot resolve... I have a grouped table whose section header and section footer get displayed correctly upon launch thanks to

- (NSS         


        

Answer 1

In the delegate method, add a method call that returns the section name, e.g.:

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    switch (section) {
        case firstSectionTag:
            return [self firstSectionTitle];
        case secondSectionTag:
            return [self secondSectionTitle];
        // ...
        default:
            return nil;
    }
}

- (NSString *)firstSectionTitle {
    // generate first section title programmatically, e.g. "return [[NSDate date] description];" 
}

// ...

Then, when you need to update the section title, send an NSNotification that triggers something like the following method:

- (void)refreshTableSectionTitles:(NSNotification *)notification {
    [tableView reloadData];
}

If the table is large and you want finer control, pass an NSNotification with an NSDictionary that contains the section you want to reload, read the dictionary in -refreshTableSectionTitles to get back the section NSInteger, and use the table view's -reloadSections:withRowAnimation: to reload that specific section.

Answer 2

You can use:

-(void)reloadSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation

And in

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

define your new header text in statement.

This will make a nice animation while changing the header/footer.

Answer 3

Use this line in your code where you want to change the title:

    [[self theTableViewToChangeItsHeader]reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationFade];

Answer 4

In Your TableViewController use

[self.tableView reloadSectionIndexTitles];