How do I adjust my popover to the size of the content in my tableview in swift?

Question

I\'m using popoverPresentationController to show my popover. The UITableViewController used to show as popover is created programmatically and will usu

Answer 1

For swift 4 if you want to observe the content size I found this to be the optimal solution. Reporting it here since I did not find a complete example online:

class MyTableViewController: UITableViewController {

    private var kvoContext = 0

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        addObserver(self, forKeyPath: #keyPath(tableView.contentSize), options: .new, context: &kvoContext)

    }

    override func viewDidDisappear(_ animated: Bool) {
        removeObserver(self, forKeyPath: #keyPath(tableView.contentSize))
        super.viewDidDisappear(animated)
    }

    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if context == &kvoContext, keyPath == #keyPath(tableView.contentSize),
            let contentSize = change?[NSKeyValueChangeKey.newKey] as? CGSize  {
            self.popoverPresentationController?.presentedViewController.preferredContentSize = contentSize
        }
    }
}