在iOS中选择并上传视频

Question

我正在构建一个应用程序，可以让用户从图库中选择一个视频并将其上传到数据库。

但是，我无法选择用户将所选视频传递给UIView / UIImageView。

例如，用户选择视频但是当按下“选择”按钮时，它无法压缩并将其传递到图库中的UIView。压缩后，它将显示此输出View Image

以下代码是我的按钮，允许用户“拍摄视频”或“从图库中选择”

@IBAction func videoBtn(_ sender: Any)
{
    let alert = UIAlertController(title: "Pick Image Source", message: "", preferredStyle: .alert)

    let takePhotoBtn = UIAlertAction(title: "Take Video", style: .default, handler: {(_ action: UIAlertAction) -> Void in
        let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
        let VideoViewController = storyBoard.instantiateViewController(withIdentifier: "VideoViewController") as! VideoViewController
        self.present(VideoViewController, animated:true, completion:nil)
    })

    let galleryBtn = UIAlertAction(title: "Select from Gallery", style: .default, handler: {(_ action: UIAlertAction) -> Void in
        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.photoLibrary) {
            let imagePicker = UIImagePickerController()
            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
            imagePicker.allowsEditing = true
            self.present(imagePicker, animated: true, completion: nil)
            imagePicker.mediaTypes = ["public.movie"]
        }
    })

    let cancelBtn = UIAlertAction(title: "Cancel", style: .default, handler: {(_ action: UIAlertAction) -> Void in
        // print("Cancel")
    })

    alert.addAction(takePhotoBtn)
    alert.addAction(galleryBtn)
    alert.addAction(cancelBtn)

    present(alert, animated: true, completion: { _ in })
}