从完成处理程序调用时，表视图不会更新

Question

I built a rename dialog to change selected list (table) entries. The rename dialog has a delagate in the main view. If the dialog is closed by clicking "save" then some database operations should be executed and the table must be refreshed:

func finishedShowing(_ vc : UIViewController, _ result : Bool) {
    if result {
        vc.dismiss(animated: true, completion: {
            if vc is RenameViewController {
                // do something in the database and update the table model
                self.refreshLibrary()
            }
        })
    }
}

private func refreshLibrary() {
    self.tableView.reloadData()
}

My problem is that the database is changed successfully so the completion handler is triggered correctly and also the table model (an array of strings in my case) is changed (I debugged it) but the table view does not update. It only shows the old version.

Answer 1

Call the reload function inside the main thread:

private func refreshLibrary() {
    DispatchQueue.main.async {
        self.tableView.reloadData()
    }
}