在选择UICollectionview中的任何其他单元格时取消选择默认选定单元格

class YourViewController: UIViewController, UICollectionViewDelegate {
    // Your code here
}

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    // 取消选择先前的选定单元格
    if let previousIndexPath = collectionView.indexPathForSelectedItem {
        collectionView.deselectItem(at: previousIndexPath, animated: true)
    }
    
    // 选择新的单元格
    collectionView.selectItem(at: indexPath, animated: true, scrollPosition: .none)
}