ios - how to make dynamic width of the UICollectionViewCell

Question

I want to set the width of UICollectionViewCell dynamically. I found some code in swift and I want the code in Objective-C.

let flowLayout = collectionViewLayout as! UICollectionViewFlowLayout
    if indexPath.item % 3 == 0 {
        let cellWidth = (CGRectGetWidth(collectionView.frame) - (flowLayout.sectionInset.left + flowLayout.sectionInset.right))
        return CGSize(width: cellWidth, height: cellWidth / 2)
    } else {
        let cellWidth = (CGRectGetWidth(collectionView.frame) - (flowLayout.sectionInset.left + flowLayout.sectionInset.right) - flowLayout.minimumInteritemSpacing) / 2
        return CGSize(width: cellWidth, height: cellWidth)
    }

Answer 1

This is the simplest solution.

Your UIViewController should implement UICollectionViewDelegateFlowLayout. Then the function below needs to be implemented on your UIviewController.

 func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

    let width = self.collectionView.frame.size.width / 2;


    return CGSize(width: width, height: 230)

}

Furthermore, you can adjust each cell's spacing value on your storyboard. Click collectionView then see the size inspector.