Question

我希望能够允许用户在选中图片库后将其从图片库上传到CollectionView中的特定单元格。我这里有两个问题。

（1）我不确定我是否正确调用了cellTapped()函数。

（2）我希望能够使用标签来存储indexpath.row，但不确定如何在imagepickercontroller函数中调用标签。感谢帮助。

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

    let cell: UICollectionViewCell = collectionView.cellForItem(at: indexPath)!
    cell.layer.borderWidth = 4.0
    cell.layer.borderColor = UIColor.blue.cgColor
    cellTapped()

}


func cellTapped(){
    let imagePicker = UIImagePickerController()
    imagePicker.delegate = self
    imagePicker.sourceType = .photoLibrary
    imagePicker.allowsEditing = false
    present(imagePicker, animated: true, completion: nil)
}


func imagePickerControllerDidCancel(_ picker: UIImagePickerController)
{
    dismiss(animated: true, completion: nil)
}


func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

    guard let selectedImage = info[.originalImage] as? UIImage else {
        fatalError("Expected a dictionary containing an image, but was provided the following: \(info)")
    }
    dismiss(animated: true, completion: nil)
    collectionView?.reloadData()
}

Answer 1

在拾取图像之前，您需要记住轻触了哪个单元格。您可以将索引保存在collectionView（_ :, didSelectItemAt：）

Map

然后，在拾取图像并重新加载集合时，您需要更新数据源。

// instance property
private var selectedCellIndexPath: IndexPath?

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

    selectedCellIndexPath = indexPath
    let cell: UICollectionViewCell = collectionView.cellForItem(at: indexPath)!
    cell.layer.borderWidth = 4.0
    cell.layer.borderColor = UIColor.blue.cgColor
    cellTapped()

}

选择该单元格后，如何将其从图像库上传到特定的collectionview单元格？

1 个答案: