Question

嗨，我在使用自定义delegate传递数据时遇到问题，请帮助所有人，这是我的代码

protocol VideoCellDelegate {
    func didSaveFavorite(for cell: SearchVideoCell)
}

然后我将delegate放入SearchVideoCell

class SearchVideoCell: UICollectionViewCell {

var delegate: VideoCellDelegate?

这是我在SearchVideoCell内的功能

@objc func handleFavorite() {
    print("Handling favorite")
    delegate?.didSaveFavorite(for: self)
}

比我在SearchVideoController中传递的尝试

class SearchVideoController: UICollectionViewController, UICollectionViewDelegateFlowLayout, VideoCellDelegate

比我所说的delegate好，但它不起作用，只打印Handling Favorite而不是saving video to favorite

func didSaveFavorite(for cell: SearchVideoCell) {
    print("saving video to favorite")
}

Answer 1

在您的function shutdown() { if [[ "$?" != "0" ]] then # Only run if previous command was not successful npm run poststart fi }中，您是否像下面那样分配了单元格的代表？

npmbash run dev

Answer 2

制作单元时，您可能没有将控制器设置为委托对象。

//在您的控制器中

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "VideoCell", for: indexPath) as! SearchVideoCell
cell.delegate = self

协议失败的数据传递

2 个答案: