Question

如何从图像的收藏视图中删除图像？其次，我将如何选择多张图像并使用共享选项调出视图或将其从收藏夹视图中删除？我对编程还比较陌生，如果有人有解决方案或知道一种更好的方法来进行编程，请回答，因为这样做会大大有益。谢谢。

class ViewController: UICollectionViewController, UIImagePickerControllerDelegate, 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
    }

var itemsSelected = [IndexPath]()

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        collectionView.allowsMultipleSelection = true
    if !(itemsSelected.contains(indexPath)) {
        itemsSelected.append(indexPath)
    }
}
@IBAction func deletePressed(_ sender: UIBarButtonItem) {

    itemsSelected.forEach {
        imageArray.remove(at:$0.row)
    }
    collectionView.deleteItems(at:itemsSelected)
    itemsSelected.removeAll()
}



}

Answer 1

要删除1张图片

let index = 0 // or any number < imageArray.count
imageArray.remove(at:index)  
collectionView.deleteItems(at: [IndexPath(row: index, section: 0)])

对于许多行删除，您需要先启用

collectionView.allowsMultipleSelection = true

并创建一个数组来保存选定的行，例如

var itemsSelected = [IndexPath]()

用户单击didSelectItemAt时会执行

if !(itemsSelected.contains(indexPath)) {
  itemsSelected.append(indexPath)
}

要删除它们时，请

itemsSelected.forEach {
  imageArray.remove(at:$0.row)
}
collectionView.deleteItems(at:itemsSelected)
itemsSelected.removeAll()

在集合视图中删除多个图像

1 个答案: