ios - 委托(delegate)函数在删除 CollectionView 项目 Swift 时无法正确调用

Question

我创建了 PhotoCollectionViewController其中包含使用 Alamofire 从服务器获取的所有照片.现在我想在照片上实现删除功能。我用过tap-gesture为了它。创建自定义警报 Xib 并成功显示。自定义警报 xib 有两个按钮 cancel和 Delete .
在删除按钮上，我创建了委托(delegate)，但由于某种原因，即使它没有正确调用，它也无法正常工作。其实我必须通过AppData?.imageList?[indexPath.row].projectUnitImageId这是从服务器中删除它的 imageID。手动没有委托(delegate)和网络服务它的工作。但是一旦我使用了委托(delegate)函数而不是调用。

问题:

需要使用委托(delegate)或其他方式，以便我可以删除。

AppData?.imageList?[indexPath.row].projectUnitImageId必须通过 ImageId 值来删除 Image Web 服务调用，但如何？

请任何人都可以指导我。

Xib FotoDeleteAlert 和委托(delegate):

protocol handleDeleteAction {
    func didDeleteButtonClicked(_: UIButton)
}

@IBDesignable class FotoDeleteAlert: UIView {

    var delegate: handleDeleteAction?

    @IBOutlet weak var deleteBtn: UIButton!

    override func awakeFromNib() {
        super.awakeFromNib()
        layoutIfNeeded()
        deleteBtn.addTarget(self, action: #selector(didDelete(_:)), for: .touchUpInside)
    }

    @IBAction func didCancel(_ sender: Any) {
        removeFromSuperview()
    }

    @IBAction func didDelete(_ sender: Any) {

        self.delegate?.didDeleteButtonClicked(sender as! UIButton)


    }
}

PhotoCollectionViewController:

let deleteAlertView: FotoDeleteAlert? = nil  // defined on the top

public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellName, for: indexPath) as! PhotoCollectionViewCell


            if(indexPath.row < (AppData?.imageList?.count ?? 0)){
                cell.imageView.isHidden = false
                cell.closeIcon.isHidden = false
                cell.addIcon.isHidden = true
                let dic = AppData?.imageList?[indexPath.row].url ?? " "
                cell.imageView.image =  UIImage(url: URL(string: dic))


                let imgId = AppData?.imageList?[indexPath.row].projectUnitImageId
                cell.closeIcon.isUserInteractionEnabled = true
                cell.closeIcon.tag = indexPath.row
                let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(removeImage(_:)))
                cell.closeIcon.addGestureRecognizer(tapGestureRecognizer)

            } else {
                cell.imageView.isHidden = true
                cell.closeIcon.isHidden = true
                cell.addIcon.isHidden = false
            }

            return cell
        }

@objc func removeImage(_ sender: AnyObject){

            deleteAlertView?.delegate = self
            let alert = FotoDeleteAlert.loadViewFromNib()
            alert!.frame = self.view.bounds
            self.view.addSubview(alert!)

        }


//MARK: - Delegate Function

    extension PhotoCollectionViewController: handleDeleteAction {

        func didDeleteButtonClicked(_ sender: UIButton) {
            // below code manual working without delegate and web services work.

            let row = sender.view.tag
            self.data?.remove(at: row.row)
            self.images?.remove(at: row.row)
            self.collectionView.reloadData()

        }
    }

Answer 1

用以下替换您的 removeImage 功能

@objc func removeImage(_ sender: AnyObject){


    let fotoXib = Bundle.main.loadNibNamed("FotoDeleteAlert", owner: self,options: nil)
    let alertView = fotoXib?.first as! FotoDeleteAlert
    alertView.delegate = self
    self.view.addSubview(alertView)

}