我正在使用 collectionView 来显示照片并委托(delegate)函数来查看自定义警报。 在照片上，我有用于删除照片的十字标记。我的委托(delegate)功能和显示项目都工作正常。 但是当我必须从服务器中删除照片时，我遇到了问题。因为我需要将准确的图像 ID 传递给 Web 服务以将其从服务器中删除。如果我使用 cell.tag，它会给我行值为 1，但实际 imgID 为 40992。如何将此值传递给我的删除委托(delegate)函数？
结构:
单元格项目显示 --tap gesture call removeImage func --- 自定义警报 -- 在删除按钮上 -- didDeleteButtonClicked 调用。
我在 cellForItem 中需要的主要值(value):
let imgId = AppData?.imageList?[indexPath.row].projectUnitImageId
照片 View Controller :
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
print(imgId)
cell.closeIcon.isUserInteractionEnabled = true
cell.closeIcon.tag = imgId ?? 0
deleteAlertView.delegate = self
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){
print(imgId)
let fotoXib = Bundle.main.loadNibNamed("FotoDeleteAlert", owner: self, options: nil)
let alertView = fotoXib?.first as! FotoDeleteAlert
alertView.delegate = self
self.view.addSubview(alertView)
}
//MARK: - Delegate Function
extension PhotoCollectionViewController: handleDeleteAction {
func didDeleteButtonClicked(_ sender: UIButton) {
print("delegate")
let row = sender.tag
print(row)
// I have to call my delete webServices here and have to pass imgId
deleteWebservices(imgId)
}
}
FotoAlert Xib 自定义提醒:
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: UIButton) {
self.delegate?.didDeleteButtonClicked(sender)
removeFromSuperview()
}
}
最佳答案
长话短说；
您设置了 cell.closeIcon 的标签，然后您使用了 FotoDeleteAlert 按钮的标签。
要修复你需要添加的内容
class FotoDeleteAlert: ... {
...
func setButtonTag(imageId: Int) {
button.tag = imageId
}
}
@objc func removeImage(_ sender: UIView){
print(imgId)
let fotoXib = Bundle.main.loadNibNamed("FotoDeleteAlert", owner: self, options: nil)
let alertView = fotoXib?.first as! FotoDeleteAlert
alertView.setButtonTag(imageId: sender.tag
alertView.delegate = self
self.view.addSubview(alertView)
}
extension PhotoCollectionViewController: handleDeleteAction {
func didDeleteButtonClicked(_ sender: UIButton) {
print("delegate")
let imgId = sender.tag
// I have to call my delete webServices here and have to pass imgId
deleteWebservices(imgId)
}
}
现在让我们清理你的意大利面条代码
您的大部分 collectionView(_:, cellForItemAt: ) 都可以移动到 PhotoCollectionViewCell 中。
我不会通过 tag 发送 id，相反你可以创建自己的委托(delegate)
最后我会把它重写成这样的:
class Controller {
func displayAlert(for info: PhotoInfo) {
// I bet this code is invalid (view isn't correctly aligned
let fotoXib = Bundle.main.loadNibNamed("FotoDeleteAlert", owner: self, options: nil)
let alertView = fotoXib?.first as! FotoDeleteAlert
alertView.delegate = self
self.view.addSubview(alertView)
}
}
extension Controller: UICollectionViewDelegate {
func collectionView(
_ collectionView: UICollectionView,
cellForItemAt indexPath: IndexPath
) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(
withReuseIdentifier: cellName, for: indexPath
) as! PhotoCollectionViewCell
let imgInfo: PhotoInfo? = AppData?.imageList?[indexPath.row]
cell.display(info: imgInfo)
cell.delegate = self
return cell
}
}
extension Controller: PhotoCollectionViewCellDelegate {
func photoCollectionViewCell(didPressCloseBtn cell: PhotoCollectionViewCell) {
guard let indexPath = collectionView.indexPath(for: cell) else { return }
if let imgInfo: PhotoInfo = AppData?.imageList?[indexPath.row] {
displayAlert(for: imgInfo)
}
}
}
extension Controller: FotoDeleteAlertDelegate {
func fotoDeleteAlert(
didPressDelete view: FotoDeleteAlert, for item: PhotoInfo?
) {
guard let item: PhotoInfo = item else { return }
deleteWebservices(item.projectUnitImageId)
}
}
protocol PhotoCollectionViewCellDelegate: class {
func photoCollectionViewCell(didPressCloseBtn: PhotoCollectionViewCell)
}
class PhotoCollectionViewCell: UICollectionViewCell {
weak var delegate: PhotoCollectionViewCellDelegate?
var closeIcon: UIButton! {
didSet {
button.addTarget(
self, action: #selector(closeTap), for: .touchUpInside
)
}
}
func display(info: PhotoInfo?) {
imageView.isHidden = info == nil
closeIcon.isHidden = info == nil
addIcon.isHidden = info != nil
if let info = info {
imageView.image = UIImage(url: URL(string: info.url))
}
}
@objc func closeTap() {
delegate?.photoCollectionViewCell(didPressCloseBtn: self)
}
}
protocol FotoDeleteAlertDelegate: class {
func fotoDeleteAlert(
didPressDelete view: FotoDeleteAlert, for item: PhotoInfo?
)
}
class FotoDeleteAlert {
weak var delegate: FotoDeleteAlertDelegate?
var deleteButton: UIButton! {
didSet {
button.addTarget(
self, action: #selector(deleteTap), for: .touchUpInside
)
}
}
private var item: PhotoInfo?
func display(item: PhotoInfo) {
self.item = item
}
@objc func deleteTap() {
delegate?.fotoDeleteAlert(didPressDelete: self, for: item)
}
}
关于ios - 将 IndexPath 行值传递给委托(delegate)函数而不是 Sender.tag 以删除图像项目 CollectionView Swift，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59468208/