A pull-down-to-refresh control for iOS that plays pong, originally created for the MHacks III iOS app
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A pull-down-to-refresh control for iOS that plays pong


It's on CocoaPods! Put pod 'BOZPongRefreshControl' in your Podfile.

Alternatively, just place BOZPongRefreshControl.h and BOZPongRefreshControl.m in your project anywhere you'd like.


Attach it to a UITableView or UIScrollView like so:

- (void)viewDidLoad
    [super viewDidLoad];
    /* NOTE: Do NOT attach the refresh control in viewDidLoad!
     * If you do this here, it'll act very funny if you have
     * a navigation bar or other such similar thing that iOS
     * automatically offsets content for. You have to wait for
     * the subviews to get laid out first so the refresh
     * control knows how big that offset is!

- (void)viewDidLayoutSubviews
    self.pongRefreshControl = [BOZPongRefreshControl attachToTableView:self.tableView

Then, implement UIScrollViewDelegate in your UIViewController if you haven't already, and pass the calls through to the refresh control:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
    [self.pongRefreshControl scrollViewDidScroll];

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
    [self.pongRefreshControl scrollViewDidEndDragging];

Lastly, make sure you've implemented the refreshAction you passed it earlier to listen for refresh triggers:

- (void)refreshTriggered
    //Go and load some data

    //Finshed loading the data, reset the refresh control
    [self.pongRefreshControl finishedLoading];

For more details, check out the demo app's code. It has examples for using the refresh control on a UIScrollView and outside of a UITableViewController.


  • Set the foreground color with the foregroundColor property
  • Set the background color with the backgroundColor property
  • Adjust how fast it plays by changing the totalHorizontalTravelTimeForBall property

Known Issues/To Do

  • It'll interfere with UIScrollView content that's above y = 0.0f
  • I haven't tested it, but I'd be willing to bet it looks a bit silly on iPads
  • Test it out on a physical iPhone 6+
  • The behavior of the paddles needs a little work
  • The the UIScrollView that it's attached to is scrolled automatically, the refresh control may be scrolled down into view under some circumstances (expanding/collapsing UITableViewCells, for example)
  • Tests!