Can I create a pull to refresh for UIViewController instead of UITableViewController in swift?

Question

I've got a simple app that have no need to be constructed with UITableViewController. Is there any chance to create 'pull to refresh' functionality for the simple UIViewController?

Answer 1

Yes, there is. In fact, in order to use UIRefreshControl there is only one requirement - you can place UIRefreshControl inside of UIScrollView or its subclass (for example UITableView or UICollectionView).

Example code in Swift:

override func viewDidLoad() {
{
    super.viewDidLoad()
    //...
    let refreshControl = UIRefreshControl()
    refreshControl.addTarget(self, action: #selector(didPullToRefresh), forControlEvents: .ValueChanged)

    scrollView.addSubview(refreshControl)
}

func didPullToRefresh() {

}

Example code in Objective-c:

- (void)viewDidLoad
{
    [super viewDidLoad];
    //...

    UIRefreshControl *refreshControl = [UIRefreshControl new];
    [refreshControl addTarget:self action:@selector(didPullToRefresh) forControlEvents:UIControlEventValueChanged];

    [self.scrollView addSubview:refreshControl];
 }

 - (void)didPullToRefresh
 {

 }

Answer 2

As of iOS 6 there is a refreshControl property on UIScrollView (and hence it's subclasses, UITableView and UICollectionView).

Code from the Apple documentation: https://developer.apple.com/documentation/uikit/uirefreshcontrol#//apple_ref/occ/instm/UIRefreshControl

func configureRefreshControl () {
   // Add the refresh control to your UIScrollView object.
   myScrollingView.refreshControl = UIRefreshControl()
   myScrollingView.refreshControl?.addTarget(self, action:
                                      #selector(handleRefreshControl),
                                      for: .valueChanged)
}

@objc func handleRefreshControl() {
   // Update your content…

   // Dismiss the refresh control.
   DispatchQueue.main.async {
      self.myScrollingView.refreshControl?.endRefreshing()
   }
}