Refreshing UITableViewData

I have UITableView 开发者_开发知识库with a navigationBar at the top. I have a refresh button in the right of the navigationBar.

When clicking on the refresh button, i need to start an activity indicator, refresh the table and stop the activity indicator.

-(void)refreshClicked{
    [spinner startAnimating];   //UIActivityIndicatorView object
    [appDelegate readJSONData]; //this is the method which populates the array
                                //for displaying in the tableview
}

I want know how to refresh the table after populating the array and then how to stop the activity indicator.

thanks :)

Refresh table:

[tableView reloadData];

Stop activity indicator:

[spinner stopAnimating];

-----EDIT-----

From your comments, I can gather that you want to smoothly fade the spinner away and reload the tableview.

For the tableview:

You can reload sections of the tableview with a nice fade animation using the following code:

[tableView reloadSections:(NSIndexSet *)sections withRowAnimation:UITableViewRowAnimationFade];

Your indexset contains all the sections you want to reload and you DO have other options for the reload animation. Look here: UITableViewRowAnimations

To create an NSIndexSet see this link

As for your spinner, you could fade it to alpha zero before calling stopAnimating by doing this:

-(void)fadeSpinner
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
    [UIView setAnimationDuration:0.5];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(stopAnimation)];

    spinner.alpha = 0;

    [UIView commitAnimations];
}

- (void)stopAnimation
{
    [spinner stopAnimating];
}

reload data:

[yourTableviewController.tableView reloadData];

and if you need to relayout:

[yourTableviewController.tableView setNeedsDisplay]; 
[yourTableviewController.tableView setNeedsLayout];