How to filter UICollectionView and keep keyboard up?

Question

I\'ve added a UISearchBar to a UICollectionView and in the delegate searchBar:textDidChange: filter my model and call [collectio

Answer 1

I faced this issue when dealing with UITextFields inside an UICollectionViewCell. I think search bar may follow the same path.

I have a bunch of collection view cells which populate from;

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let question = questions[indexPath.row]
    let cell: QuestionBaseCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: cellName, for: indexPath) as! QuestionBaseCollectionViewCell
    cell.arrangeCell(question: question) // Here cell populates from server data 
    cell.delegate = self
    return cell
}

This QuestionBaseCollectionViewCell has a delegate method, which updates the answer of the question to its delegate. I need to update the server side data.

In the delegate method; If I put reloadData method the textfield resigns and keyboard is disappearing.

Also I do not have direct access to the UITextField which yields to I cannot use cell.textField.becomeFirstResponder() etc.

So, I comment out the reloadData() method.

func questionCollectionViewCell(_ cell: QuestionBaseCollectionViewCell, didChange choice: Choice) {
    guard let indexPath = collectionView.indexPath(for: cell) else { return }
    var question = questions[indexPath.row]
    guard let choiceIndex = question.choices?.firstIndex(where: { $0.id == choice.id }) else { return }
    question.choices?[choiceIndex] = choice
    questions[indexPath.row] = question

    // collectionView.reloadData()
}

Here is what I did;
I made call to reloadData() after keyboard dismiss. See below.

Just add a keyboardDidHideNotification to the corresponding view controller in viewWillAppear method (note: you may put wherever you want depends on your needs) as follows:

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    NotificationCenter.default.addObserver(self,
                                           selector: #selector(handleKeyboardDidHide(_ :)),
                                           name: UIResponder.keyboardDidHideNotification,
                                           object: nil)
}

and the observer method;

@objc func handleKeyboardDidHide(_ notification: Notification) {
    collectionView.reloadData()
}

That's it. After the keyboard will hide, you may save your data.

Hope it helps!