ios - 使用ImagePicker上传图片到CollectionView

Question

我试图让用户通过 UIPickerView 选择或拍摄图像，并将所选图像添加到 Collection View 单元格，从而创建自定义相册。当我选择图像时， Collection View 中没有任何内容。如果有人有解决方案或知道更好的方法，请回复，因为我对编程还比较陌生。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!)


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
    imageArray.append(imageViewTwo.image!)
    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

将新图像附加到数据源后，调用 YOUR_COLLECTION_VIEW.reloadData() 只是为了显示最近添加到其数据源的新项目。