ios - 在 Collection View 中选择和删除图像

Question

我如何选择多张图片并打开带有共享选项的 View ，或者如何将它们从收藏 View 中删除？我对编程比较陌生，如果有人有解决方案或知道更好的方法，请回复，因为这将非常有益。谢谢。

class ViewController: UICollectionViewController, UIImagePickerControllerDelehye5gate, UINavigationControllerDelegate, UICollectionViewDelegateFlowLayout {
    @IBOutlet weak var imageViewTwo: UIImageView!

    var imageArray = [UIImage]()

    override func viewDidLoad() {
        super.viewDidLoad()
        imageViewTwo.isHidden = true
    }

    @IBAction func chooseImage(_ sender: UIBarButtonItem) {
        let imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self

        let actionSheet = UIAlertController(title: "Photo Source", message: "Choose a Source", preferredStyle: .actionSheet)

        actionSheet.addAction(UIAlertAction(title: "Camera", style: .default, handler: { (action: UIAlertAction) in
            if UIImagePickerController.isSourceTypeAvailable(.camera) {
                imagePickerController.sourceType = .camera
                self.present(imagePickerController, animated: true, completion: nil)
            } else {
                print("Camera is not available.")
            }
        }))

        actionSheet.addAction(UIAlertAction(title: "Photo Library", style: .default, handler: { (action: UIAlertAction) in
            imagePickerController.sourceType = .photoLibrary
            self.present(imagePickerController, animated: true, completion: nil)
        }))

        actionSheet.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))

        self.present(actionSheet, animated: true, completion: nil)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        let image = info[UIImagePickerController.InfoKey.originalImage] as! UIImage

        imageViewTwo.image = image
        imageArray.append(imageViewTwo.image!)
        collectionView.reloadData()

        picker.dismiss(animated: true, completion: nil)
    }

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

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

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)

        let imageView = cell.viewWithTag(1) as! UIImageView
        imageView.image = imageArray[indexPath.row]
        return cell
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let width = collectionView.frame.width / 3 - 1

        return CGSize(width: width, height: width)
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
        return 1.0
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
        return 1.0
    }
}

Answer 1

在你的cellForItemAt

override func collectionView(_ collectionView: UICollectionView, cellForItemAt 
    indexPath: IndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)

    let imageView = cell.viewWithTag(1) as! UIImageView
    imageArray.append(imageViewTwo.image!)
    imageView.image = imageArray[indexPath.row]
    return cell
}

你有这条线

imageArray.append(imageViewTwo.image!)

这是将额外的图像添加到数组中，您已经在 didFinishPickingMediaWithInfo 方法中将图像添加到此数组中，这会导致重复。