Swift 4 - UIRefreshControl on vertical UICollectionView lags - swift

Question

For some reason, my pull to refresh is really hard to complete. What I mean by that, is that in order to pull-to-refresh I have to begin from the very top of my collection view and scroll down to the very bottom... sometimes I even have to use a second finger in order to scroll more to make it work!
Here's how I initialise the refresher:
private var refresher: UIRefreshControl!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
refresher = UIRefreshControl()
refresher.addTarget(self, action: #selector(self.requestRefreshContent), for: .valueChanged)
if #available(iOS 10.0, *) {
schoolPostsCollectionView.refreshControl = refresher
}
else {
schoolPostsCollectionView.addSubview(refresher)
}
refresher.beginRefreshing()
}
Here's how I call beginRefreshing():
private func getContentOfSchool() {
someBackgroundServerCall() {
// some code
...
DispatchQueue.main.async {
self.refresher.endRefreshing()
self.schoolPostsCollectionView.reloadData()
}
}
}
Any idea why is this happening?

Answer 1

try this one....
refresher = UIRefreshControl()
refresher.attributedTitle = NSAttributedString(string: "Refreshing...", attributes: nil)
refresher.tintColor = UIColor.black
refresher.addTarget(self, action: #selector(self.requestRefreshContent), for: .valueChanged)
if #available(iOS 10.0, *) {
schoolPostsCollectionView.refreshControl = refresher
} else {
schoolPostsCollectionView.backgroundView = refresher
}