Can I use a UIRefreshControl in a UIScrollView?

Question

I have about 5 UIScrollView's already in my app which all load multiple .xib files. We now want to use a UIRefreshControl. They are built to be used with UITableViewControllers (per UIRefreshControl class reference). I do not want to re-do how all 5 UIScrollView work. I have already tried to use the UIRefreshControl in my UIScrollView's, and it works as expected except for a few things.

1. Just after the refresh image turns into the loader, the UIScrollView jumps down about 10 pixels, which only does not happen when I am very careful to drag the UIScrollview down very slowly.

2. When I scroll down and initiate the reload, then let go of the UIScrollView, the UIScrollView stays where I let it go. After it is finished reloading, the UIScrollView jumps up to the top with no animation.

Here is my code:

-(void)viewDidLoad
{
      UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
      [refreshControl addTarget:self action:@selector(handleRefresh:) forControlEvents:UIControlEventValueChanged];
      [myScrollView addSubview:refreshControl];
}

-(void)handleRefresh:(UIRefreshControl *)refresh {
      // Reload my data
      [refresh endRefreshing];
}

Is there any way I can save a bunch of time and use a UIRefreshControl in a UIScrollView?

Thank You!!!

Answer 1

Since iOS 10 UIScrollView already has a refreshControl property. This refreshControl will appear when you create a UIRefereshControl and assign it to this property.

There's no need to add UIRefereshControl as a subview anymore.

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()
   }
}

A UIRefreshControl object is a standard control that you attach to any UIScrollView object

Code and quote from https://developer.apple.com/documentation/uikit/uirefreshcontrol