ios - 从函数更改 uicollectionViewCell 上的图像

Question

我有这个代码:

MainCell.swift:

    @IBOutlet weak var imageView: UIImageView! 
    @IBOutlet weak var titleLabel: UILabel! 
    @IBOutlet weak var cellView: UIView!
    @IBOutlet weak var cellViewOption: UIView!
    @IBOutlet weak var cellViewOptionFavorite: UIButton!
    @IBOutlet weak var favoriteBtn1: UIButton!
    @IBOutlet weak var favoriteBtn2: UIButton!
    @IBOutlet weak var favoriteBtn3: UIButton!
    @IBOutlet weak var favoriteIcon1: UIImageView!
    @IBOutlet weak var favoriteIcon2: UIImageView! 
    @IBOutlet weak var favoriteIcon3: UIImageView!

MainController.swift:

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return productsObjectArray.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell10", for: indexPath) as! MainViewCollectionViewCell
        cell.titleLabel.text = productsObjectArray[indexPath.item].name
        let documentsDir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
        let imageFileName = productsObjectArray[indexPath.item].code
        let fullImagePath = documentsDir.appendingPathComponent("GET_PHOTO").path + "/" + imageFileName! + ".jpg"
        cell.imageView.image = UIImage(contentsOfFile:   fullImagePath)

        let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(MainViewControler.rightSwiped))
        swipeRight.direction = UISwipeGestureRecognizerDirection.right
        cell.addGestureRecognizer(swipeRight)

        let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(MainViewControler.leftSwiped))
        swipeLeft.direction = UISwipeGestureRecognizerDirection.left
        cell.addGestureRecognizer(swipeLeft)

        cell.favoriteBtn1.tag =  indexPath.item
        cell.favoriteBtn1.addTarget(self, action: #selector(favoriteBtnPressed1(_:)), for: .touchUpInside)

        cell.favoriteBtn2.tag =  indexPath.item
        cell.favoriteBtn2.addTarget(self, action: #selector(favoriteBtnPressed2(_:)), for: .touchUpInside)

        cell.favoriteBtn3.tag =  indexPath.item
        cell.favoriteBtn3.addTarget(self, action: #selector(favoriteBtnPressed3(_:)), for: .touchUpInside)

        return cell
    }

    @objc func favoriteBtnPressed1(_ sender: UIButton) {
        let productStatus = checkProductFavoriteIsAvailable(favoriteKey: "favoriteProducts1", productId: productsObjectArray[sender.tag].code!)
        if productStatus == true {
            removeProductFromFavorites(favoriteKey: "favoriteProducts1", productId: productsObjectArray[sender.tag].code!)
            changeFavoritesImage(favoriteId: 1, status: 0)
        } else {
            saveProductToFavorites(favoriteKey: "favoriteProducts1", productId: productsObjectArray[sender.tag].code!)
            changeFavoritesImage(favoriteId: 1, status: 1)
        }
    }

    @objc func favoriteBtnPressed2(_ sender: UIButton) {
        let productStatus = checkProductFavoriteIsAvailable(favoriteKey: "favoriteProducts2", productId: productsObjectArray[sender.tag].code!)
        if productStatus == true {
            removeProductFromFavorites(favoriteKey: "favoriteProducts2", productId: productsObjectArray[sender.tag].code!)
            changeFavoritesImage(favoriteId: 2, status: 0)
        } else {
            saveProductToFavorites(favoriteKey: "favoriteProducts2", productId: productsObjectArray[sender.tag].code!)
            changeFavoritesImage(favoriteId: 2, status: 1)
        }
    }

    @objc func favoriteBtnPressed3(_ sender: UIButton) {
        let productStatus = checkProductFavoriteIsAvailable(favoriteKey: "favoriteProducts3", productId: productsObjectArray[sender.tag].code!)
        if productStatus == true {
            removeProductFromFavorites(favoriteKey: "favoriteProducts3", productId: productsObjectArray[sender.tag].code!)
            changeFavoritesImage(favoriteId: 3, status: 0)
        } else {
            saveProductToFavorites(favoriteKey: "favoriteProducts3", productId: productsObjectArray[sender.tag].code!)
            changeFavoritesImage(favoriteId: 3, status: 1)
        }
    }

    func checkProductFavoriteIsAvailable(favoriteKey: String, productId: String) -> Bool{
        var status = false
        if let arr = UserDefaults.standard.array(forKey: favoriteKey) as? [String]{
            print(arr)
            for favoriteProduct in arr{
                if productId == favoriteProduct {
                    status = true
                    break
                }
            }
        }
        return status
    }

    func saveProductToFavorites(favoriteKey: String, productId: String) {
        if var favoriteArray = UserDefaults.standard.stringArray(forKey: favoriteKey) {
            if !favoriteArray.contains(productId) {
                favoriteArray.append(productId)
                UserDefaults.standard.set(favoriteArray, forKey: favoriteKey)
            }
        } else {
            let favoriteArray = [productId]
            UserDefaults.standard.set(favoriteArray, forKey: favoriteKey)
        }
    }

    func removeProductFromFavorites(favoriteKey: String, productId: String) {
        guard var favoriteArray = UserDefaults.standard.stringArray(forKey: favoriteKey),
            let index = favoriteArray.index(of: productId) else { return }
        favoriteArray.remove(at: index)
        UserDefaults.standard.set(favoriteArray, forKey: favoriteKey)
    }

    func changeFavoritesImage(favoriteId: Int, status: Int){
        if favoriteId == 1 && status == 0 {
            favoriteIcon1.image = UIImage(named: "favourites_off_icon.png")
        }
        if favoriteId == 1 && status == 1 {
            favoriteIcon1.image = UIImage(named: "favourites_icon.png")
        }

        if favoriteId == 2 && status == 0 {
            favoriteIcon2.image = UIImage(named: "favourites_off_icon.png")
        }
        if favoriteId == 2 && status == 1 {
            favoriteIcon2.image = UIImage(named: "favourites_icon.png")
        }

        if favoriteId == 3 && status == 0{
            favoriteIcon3.image = UIImage(named: "favourites_off_icon.png")
        }
        if favoriteId == 3 && status == 1 {
            favoriteIcon3.image = UIImage(named: "favourites_icon.png")
        }
    }

   func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let productObject = productsObjectArray[indexPath.item]
        showSubViewInContainerViewProductCard(view: "ProductDetailView", object: [productObject], productsFilter: 0, marketProductsFilter: 0, menuFilter: 0, preparationFilter: 0, glutenFilter: 0,  backFromProductView: false)
    }    

在 changeFavoritesImage 函数中，我想将图像更改为 UICollectionViewCell。错误:

Mam błąd: Use of unresolved identifier 'favoriteIcon3', Use of unresolved identifier 'favoriteIcon2', Use of unresolved identifier 'favoriteIcon1'

我的代码显示产品列表。我的按钮可以将这些产品添加到收藏夹、观看等。我想根据产品的状态更改产品列表中的图片。

如何解决？

Answer 1

按如下方式更改您的方法

func changeFavoritesImage(ofSender sender:UIButton,favoriteId: Int, status: Int){

    guard let cell = collectionview.cellForItem(at: IndexPath.init(item: sender.tag, section: 0)) as? MainViewCollectionViewCell else {return} 

    if favoriteId == 1 && status == 0 {
        cell.favoriteIcon1.image = UIImage(named: "favourites_off_icon.png")
    }
    if favoriteId == 1 && status == 1 {
        cell.favoriteIcon1.image = UIImage(named: "favourites_icon.png")
    }

    if favoriteId == 2 && status == 0 {
        favoriteIcon2.image = UIImage(named: "favourites_off_icon.png")
    }
    if favoriteId == 2 && status == 1 {
        cell.favoriteIcon2.image = UIImage(named: "favourites_icon.png")
    }

    if favoriteId == 3 && status == 0{
        cell.favoriteIcon3.image = UIImage(named: "favourites_off_icon.png")
    }
    if favoriteId == 3 && status == 1 {
        cell.favoriteIcon3.image = UIImage(named: "favourites_icon.png")
    }
}

并更改按钮操作中的方法调用，如下所示

@objc func favoriteBtnPressed1(_ sender: UIButton) {
    let productStatus = checkProductFavoriteIsAvailable(favoriteKey: "favoriteProducts1", productId: productsObjectArray[sender.tag].code!)
    if productStatus == true {
        removeProductFromFavorites(favoriteKey: "favoriteProducts1", productId: productsObjectArray[sender.tag].code!)
        changeFavoritesImage(ofSender:sender,favoriteId: 1, status: 0)
    } else {
        saveProductToFavorites(favoriteKey: "favoriteProducts1", productId: productsObjectArray[sender.tag].code!)
        changeFavoritesImage(ofSender:sender,favoriteId: 1, status: 1)
    }
}

@objc func favoriteBtnPressed2(_ sender: UIButton) {
    let productStatus = checkProductFavoriteIsAvailable(favoriteKey: "favoriteProducts2", productId: productsObjectArray[sender.tag].code!)
    if productStatus == true {
        removeProductFromFavorites(favoriteKey: "favoriteProducts2", productId: productsObjectArray[sender.tag].code!)
         changeFavoritesImage(ofSender:sender,favoriteId: 2, status: 0)
    } else {
        saveProductToFavorites(favoriteKey: "favoriteProducts2", productId: productsObjectArray[sender.tag].code!)
        changeFavoritesImage(ofSender:sender,favoriteId: 2, status: 1)
    }
}

@objc func favoriteBtnPressed3(_ sender: UIButton) {
    let productStatus = checkProductFavoriteIsAvailable(favoriteKey: "favoriteProducts3", productId: productsObjectArray[sender.tag].code!)
    if productStatus == true {
        removeProductFromFavorites(favoriteKey: "favoriteProducts3", productId: productsObjectArray[sender.tag].code!)
        changeFavoritesImage(ofSender:sender,favoriteId: 3, status: 0)
    } else {
        saveProductToFavorites(favoriteKey: "favoriteProducts3", productId: productsObjectArray[sender.tag].code!)
        changeFavoritesImage(ofSender:sender,favoriteId: 3, status: 1)
    }
}

在上面的代码中，我刚刚更改了您的方法的实现以接受发送者参数，以便我们可以使用它来获取单元格，如代码所示