Hello all:
I have a collectionview using a custom cell that has 2 buttons in each cell. I need to display an alert to the User when a button is tapped, and tried this:
@IBAction func testButton_Tapped(_ sender: Any)
{
print("Test Button tapped")
let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "Close", style: .default, handler: nil)
alertController.addAction(defaultAction)
self.present(alertController, animated: true, completion: nil)
}
but I get an error: Value of type 'DeviceCell' has no member 'present'. Note the function works, I get the print statement.
The alert does work if I put it in the ViewController extension here:
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath){}
but it only works then if I tap the Cell itself, not the button.
Any and all input is appreciated!
John.
As you found, there's no `present(_:animated:completion:)` method in `UICollectionViewCell` class.
You need a ViewController to show alert.
One way to solve this issue, is having a `viewContoller` property in the cell class:
class MyCell: UICollectionViewCell {
//...
weak var viewController: UIViewController?
//...
@IBAction func testButton_Tapped(_ sender: Any) {
print("Test Button tapped")
let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "Close", style: .default, handler: nil)
alertController.addAction(defaultAction)
viewController?.present(alertController, animated: true, completion: nil)
}
//...
}You set the property in `collectionView(_:cellForItemAt:)` in your ViewController class:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MyCell", for: indexPath) as! MyCell
//...
cell.viewController = self
return cell
}