pre select/highlight UICollectionViewCell on first load of view

Question

Im trying to preselect the first object/UICollectionViewCell in the UICollectionView? I have tried:

self.dateCollectionView.allowsMultipleSelection=NO;

[self.da         


        

Answer 1

For swift 3

Use collectionView.selectItem with-in this overload collectionView(UICollectionView, IndexPath)

This is my code, in this code I pre selected row with indexPath.row = 0

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = ScenarioCollectionView.dequeueReusableCell(withReuseIdentifier: "ReuseScenarioCollectionViewCell", for: indexPath as IndexPath) as! ScenarioCollectionViewCell

    if (indexPath.row == 0){
        collectionView.selectItem(at: indexPath, animated: true, scrollPosition: UICollectionViewScrollPosition.centeredHorizontally)
        cell.layer.borderColor=UIColor.gray.cgColor        
    }else{
        cell.layer.borderColor=UIColor.white.cgColor
    }
    return cell
}


func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let cell = collectionView.cellForItem(at: indexPath)
    cell?.layer.borderColor = UIColor.gray.cgColor
        }

func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
    let cell = collectionView.cellForItem(at: indexPath as IndexPath)
    cell?.layer.borderColor = UIColor.white.cgColor
    collectionView.deselectItem(at: indexPath, animated: true)
}