swift - 在照片库 Swift 中保存视频

Question

我想弄清楚如何在我的照片库中保存视频。首先，我尝试使用 UIImagePickerController 简单地选择一个视频，并在选择后使用 UISaveVideoAtPathToSavedPhotosAlbum 将其再次保存在库中。没有多大意义，但我试图了解保存视频的工作原理。

以下代码不起作用，因为它不保存视频:

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

    imagePickerController.mediaTypes = ["public.movie"]
    self.present(imagePickerController, animated: true, completion: nil)
    }

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

    let videoURL = info[UIImagePickerController.InfoKey.mediaURL] as? URL
    print(UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(videoURL!.path))

    dismiss(animated: true, completion: {
        UISaveVideoAtPathToSavedPhotosAlbum(videoURL!.path, self,  #selector(self.video(_:didFinishSavingWithError:contextInfo:)), nil)
    })
}

我希望你能帮助我，因为我找不到太多关于保存视频的信息。

此致，
MB

解决方案:

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any])
{
    // *** store the video URL returned by UIImagePickerController *** //
    let videoURL = info[UIImagePickerController.InfoKey.mediaURL] as! URL

    // *** load video data from URL *** //
    let videoData = NSData(contentsOf: videoURL)

    // *** Get documents directory path *** //
    let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)[0]

    // *** Append video file name *** //

    print(paths)
    let dataPath = paths.appending("/videoFileName.mp4")

    // *** Write video file data to path *** //
    videoData?.write(toFile: dataPath, atomically: false)

    PHPhotoLibrary.shared().performChanges({
        PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: URL(fileURLWithPath: dataPath))
    }) { saved, error in
        if saved {
            let fetchOptions = PHFetchOptions()
            fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]

            let fetchResult = PHAsset.fetchAssets(with: .video, options: fetchOptions).firstObject
            // fetchResult is your latest video PHAsset
            // To fetch latest image  replace .video with .image
        }
    }
}

Answer 1

使用以下函数将视频保存到文档目录

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) 
{
    // *** store the video URL returned by UIImagePickerController *** //
    let videoURL = info[UIImagePickerControllerMediaURL] as! NSURL

    // *** load video data from URL *** //
    let videoData = NSData(contentsOfURL: videoURL)

    // *** Get documents directory path *** //
    let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0]

    // *** Append video file name *** //
    let dataPath = documentsDirectory.stringByAppendingPathComponent("/videoFileName.mp4")

    // *** Write video file data to path *** //
    videoData?.writeToFile(dataPath, atomically: false)
}

现在将此视频保存在照片凝胶中

PHPhotoLibrary.shared().performChanges({
    PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: Your document directory file)
}) { saved, error in
    if saved {
        let fetchOptions = PHFetchOptions()
        fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]

        let fetchResult = PHAsset.fetchAssets(with: .video, options: fetchOptions).firstObject
        // fetchResult is your latest video PHAsset
        // To fetch latest image  replace .video with .image
    }
}

之后，如果您不需要，则从文档目录中删除图像
，我希望它对你有用...:)