结合使用UIImagePickerController和UICollectionView

debugcn 发表于 Dev

哈哈尔·埃尔库米基

我正在用下面的代码来编写一段代码：

-每次点击按钮都会打开一个新视图，并允许用户从手机图库中选择图像。
-所选图像应加载并在水平滚动视图中显示。

我面临的问题是，选择图像时选择器会自动关闭，但是选择器关闭时图像不会加载到UIcollectionView内（占位符图像保留并且未被所选图像替换）。我的控制台没有崩溃或错误。谢谢你的帮助！

这是我针对此功能的视图控制器：

public class ImagePickerViewController: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate, UICollectionViewDelegate, UICollectionViewDataSource {

    var mediaArray = [UIImage]()

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

        let actionSheet = UIAlertController(title: "Gallery image", message: "Choose an image from your gallery", preferredStyle: .actionSheet)

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

        }))

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

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

    }

    public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        let selectedImage = info[UIImagePickerController.InfoKey.originalImage] as! UIImage

        mediaArray.append(selectedImage)


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


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



    public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

        return mediaArray.count
    }

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

        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MediaCollectionViewCell", for: indexPath) as! MediaCollectionViewCell

        cell.mediaContent.image = mediaArray[indexPath.row]

        return cell
    }



}

这是我的水平滚动视图的一部分

穆罕默德·阿夫扎尔（Muhammad Afzal）

选择图片获取后，重新加载您的收藏夹视图。

public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        let selectedImage = info[UIImagePickerController.InfoKey.originalImage] as! UIImage

        mediaArray.append(selectedImage)


        picker.dismiss(animated: true) {
            self.collectionView.reloadData()
        }
    }

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