How to present UIAlertController when finished multiple selection in UICollectionView - ios

Question

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: ShiftCollectionViewCell.identifier, for: indexPath) as? ShiftCollectionViewCell else {
return UICollectionViewCell()
}
let model = shiftSection[indexPath.section].options[indexPath.row]
cell.configure(withModel: OptionsCollectionViewCellViewModel(id: 0, data: model.title))
return cell
}
func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
collectionView.indexPathsForSelectedItems?.filter({ $0.section == indexPath.section }).forEach({ collectionView.deselectItem(at: $0, animated: false) })
return true
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let model = shiftSection[indexPath.section].options[indexPath.row]
print(model.title)
if indexPath.section == 2 {
showAlert()
}
}
my goal is to show alert when finished multiple selection in collectionview
Thankyou in advance :)

Answer 1

Your description is a bit thin so I am guessing/assuming that what you want is kind of; After user selects an item in every section an alert view should be shown.
To achieve this you could have a nullable property for each of possible selection and then check if all of them are set. For instance imagine having
private var timeMode: TimeMode?
private var shift: Shift?
private var startTime: StartTime?
now on didSelectItemAt you would try and fill these properties like:
if indexPath.section == 0 { // TODO: rather use switch statement
timeMode = allTimeModes[indexPath.row]
} else if indexPath.section == 1 {
shift = allShifts[indexPath.row]
} ...
then at the end of this method (preferably call a new method) execute a check like
guard let timeMode = self.timeMode else { return }
guard let shift = self.shift else { return }
guard let startTime = self.startTime else { return }
showAlert()
Alternatively
You can use a collection view property indexPathsForSelectedItems to determine what all is selected in a similar way every time user selects something:
guard let timeModeIndex = collectionView.indexPathsForSelectedItems?.first(where: { $0.section == 0 })?.row else { return }
guard let shiftIndex = collectionView.indexPathsForSelectedItems?.first(where: { $0.section == 1 })?.row else { return }
guard let startTimeIndex = collectionView.indexPathsForSelectedItems?.first(where: { $0.section == 2 })?.row else { return }
showAlert()
I hope this puts you on the right track.