Question

我想默认突出显示UICollectionView的特定单元格但是我不能这样做。代码如下。

UIView（在init方法中）：

    let selectedIndexPath = IndexPath(item: 0, section: 0)
    collectionView.selectItem(at: selectedIndexPath, animated: false, scrollPosition: [])

UICollectionViewCell：

override var isSelected: Bool {
    didSet {
        imageView.tintColor = isSelected ? UIColor.white : UIColor.red
    }
}

默认情况下，如何选择UICollectionView的特定索引路径？如果您需要任何其他信息来解决它，请告诉我。谢谢。

Answer 1

您应该覆盖此方法

override func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
//you should set needed cells as selected here, or set it to deselected, because it is your responsibility now 
    var shouldSelect = false //or true
    cell.isSelected = shouldSelect
}

但在这种情况下，您应该跟踪collectionView（_ collectionView：UICollectionView，didSelectItemAt indexPath：IndexPath）方法并在选择时重新加载集合。

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    collectionView.reloadData()
//or reload sections 
}

Answer 2

我只需在下方添加，然后就可以了。

    func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
    //add here
    let selectedIndexPath = IndexPath(item: 0, section: 0)
    collectionView.selectItem(at: selectedIndexPath, animated: false, scrollPosition: [])
}

如何默认选择UICollectionView的特定索引路径？

2 个答案: