如何將視頻文件保存到文檔目錄中

Question

我正在使用以下代碼捕獲視頻：

UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
ipc.sourceType =  UIImagePickerControllerSourceTypeCamera;
ipc.delegate = self;
//need to handle delegates methods 
//
ipc.allowsEditing = YES;
ipc.videoQuality = UIImagePickerControllerQualityTypeMedium;
ipc.videoMaximumDuration = 30.0f; // 30 seconds
//temporary duation of 30 seconds for testing

ipc.mediaTypes = [NSArray arrayWithObject:@"public.movie"];
// ipc.mediaTypes = [NSArray arrayWithObjects:@"public.movie", @"public.image", nil];
[self presentModalViewController:ipc animated:YES]; 
//this controller allows to record the videos

我可以使用以下代碼將錄制的視頻保存到相冊

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{ 
    // recover video URL
    NSURL *url = [info objectForKey:UIImagePickerControllerMediaURL];

    // check if video is compatible with album
    BOOL compatible = UIVideoAtPathIsCompatibleWithSavedPhotosAlbum([url path]);

    // save
    if (compatible){
        UISaveVideoAtPathToSavedPhotosAlbum([url path], self, @selector(video:didFinishSavingWithError:contextInfo:), NULL);
        NSLog(@"saved!!!! %@",[url path]);
    }
    [self dismissModalViewControllerAnimated:YES];
    [picker release];
}

但是我需要從相冊中檢索該文件並需要存儲到文檔目錄中？

Answer 1

將視頻保存到文檔目錄如下：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
    NSData *videoData = [NSData dataWithContentsOfURL:videoURL];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *tempPath = [documentsDirectory stringByAppendingFormat:@"/vid1.mp4"];
    BOOL success = [videoData writeToFile:tempPath atomically:NO];
    [picker dismissModalViewControllerAnimated:YES];
}

Answer 2

如果有人在將來需要它，這是快速的代碼：

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {

    let videoURL = info[UIImagePickerControllerMediaURL] as! NSURL
    let videoData = NSData(contentsOfURL: videoURL)
    let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
    let documentsDirectory: AnyObject = paths[0]
    let dataPath = documentsDirectory.stringByAppendingPathComponent("/vid1.mp4")

    videoData?.writeToFile(dataPath, atomically: false)
    self.dismissViewControllerAnimated(true, completion: nil)

}

Answer 3

#pragma mark -
#pragma mark File Names and Paths
// Creates the path if it does not exist.
- (void)ensurePathAt:(NSString *)path {
    NSFileManager *fm = [NSFileManager defaultManager];
    if ( [fm fileExistsAtPath:path] == false ) {
        [fm createDirectoryAtPath:path
      withIntermediateDirectories:YES
                       attributes:nil
                            error:NULL];
    }
}
- (NSString *)documentPath {
    if ( ! documentPath_ ) {
        NSArray *searchPaths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        documentPath_ = [searchPaths objectAtIndex: 0];
        documentPath_=[documentPath_ stringByAppendingPathComponent:@"VideoAlbum"];
        [documentPath_ retain];
    }
    return documentPath_;
}

- (NSString *)audioPath {
    if ( ! AudioPath_ ) {
        AudioPath_ = [[self documentPath] stringByAppendingPathComponent:@"Demo"];
        NSLog(@"%@",AudioPath_);
        [AudioPath_ retain];
        [self ensurePathAt:AudioPath_];
    }
    return AudioPath_;
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSString *type = [info objectForKey:UIImagePickerControllerMediaType];

    if ([type isEqualToString:(NSString *)kUTTypeVideo] || [type isEqualToString:(NSString *)kUTTypeMovie])
    {
        NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];

        NSData *videoData = [NSData dataWithContentsOfURL:videoURL];
        tempPath = [[self audioPath] stringByAppendingFormat:@"/%@.mp4",[NSDate date]];
        BOOL success = [videoData writeToFile:tempPath atomically:NO];

        NSLog(@"%hhd",success);
    }
    [[picker presentingViewController] dismissViewControllerAnimated:YES completion:nil];
}

Answer 4

一點研發，這對我有用

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{

 NSURL *url = [info objectForKey:UIImagePickerControllerMediaURL];
  // Save video to app document directory

NSString *filePath = [url path];
NSString *pathExtension = [filePath pathExtension] ;
if ([pathExtension length] > 0)
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) ;
    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *localFilePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@", [filePath lastPathComponent]]];

   // Method last path component is used here, so that each video saved will get different name.

    NSError *error = nil ;
    BOOL res = [[NSFileManager defaultManager] moveItemAtPath:filePath toPath:localFilePath error:&error] ;

    if (!res)
    {
        NSLog(@"%@", [error localizedDescription]) ;
    }
    else
    {
       NSLog(@"File saved at : %@",localFilePath);
    }
}

}

//此外，當您必須檢查應用程序文檔目錄中是否存在相同的視頻並且您不想創建它的多個副本時，請進行一些更改，如下所示

NSURL *url = [info objectForKey:UIImagePickerControllerMediaURL];
NSURL *videoAsset = [info objectForKey:UIImagePickerControllerReferenceURL];

__weak typeof(self) weakSelf = self;

ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library assetForURL:videoAsset resultBlock:^(ALAsset *asset)
{
    weakSelf.selectedFileName = [[asset defaultRepresentation] filename];
    NSLog(@"Video Filename %@",weakSelf.selectedFileName);

    // Save video to doc directory
    NSString *filePath = [url path];
    NSString *pathExtension = [filePath pathExtension] ;
    if ([pathExtension length] > 0)
    {
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) ;
        NSString *documentsDirectory = [paths objectAtIndex:0];

        NSString *localFilePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@", weakSelf.selectedFileName]];

        //check if same video is having its copy in app directory.
        //so that multiple entries of same file should not happen.

        BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:localFilePath];

        if (!fileExists)
        {
            NSError *error = nil ;

            BOOL res = [[NSFileManager defaultManager] moveItemAtPath:filePath toPath:localFilePath error:&error] ;

            if (!res)
            {
                NSLog(@"%@", [error localizedDescription]) ;
            }
            else
            {
                NSLog(@"File saved at : %@",localFilePath);
                weakSelf.filePathURL = [NSURL URLWithString:localFilePath];
            }
        }
        else
        {
            NSLog(@"File exist at : %@",localFilePath);
            weakSelf.filePathURL = [NSURL URLWithString:localFilePath];
        }

    }
}

}

//其中weakSelf.selectedFileName和weakSelf.filePathURL分別是我的類的NSString和NSURL類型屬性。

Answer 5

我們可以使用NSFileManager的moveItemAtPath:toPath:error:方法將視頻文件移動到我們應用程序的文檔目錄中。 它效率更高。

此外，我們應該獲取視頻文件的擴展名並將其用作我們本地視頻文件名的擴展名。

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [self dismissViewControllerAnimated:YES completion:nil] ;

    if ([info[UIImagePickerControllerMediaType] isEqualToString:(NSString *)kUTTypeMovie]) {
        // video
        NSURL *url = [info[UIImagePickerControllerMediaType] ;
        NSString *filePath = [url path] ;
        NSString *pathExtension = [filePath pathExtension] ;
        if ([pathExtension length] > 0) {
            NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) ;
            NSString *documentsDirectory = [paths objectAtIndex:0] ;
            NSString *localFilePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"temp.%@", pathExtension]] ;
            NSError *error = nil ;
            BOOL res = [[NSFileManager defaultManager] moveItemAtPath:filePath toPath:localFilePath error:&error] ;
            if (!res) {
                NSLog(@"%@", [error localizedDescription]) ;
            }
        }
    }
}

這個對我有用。

Answer 6

 videoUrl = [info objectForKey:UIImagePickerControllerMediaURL];
urlString=[urlvideo path];
NSLog(@"path url %@",videoUrl);
NSData *videoData = [NSData dataWithContentsOfURL:videoUrl];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *sourcePath = [documentsDirectory stringByAppendingPathComponent:@"yourfilename.mp4"];

[videoData writeToFile:sourcePath atomically:YES];
//Below code will save video to iOS Device
 ALAssetsLibrary* library = [[ALAssetsLibrary alloc] init];
[library writeVideoAtPathToSavedPhotosAlbum:videoUrl
                            completionBlock:^(NSURL *assetURL, NSError *error){/*notify of completion*/}];

[picker dismissViewControllerAnimated:YES completion:nil];

希望這有幫助

Answer 7

    videoURL = info[UIImagePickerControllerMediaURL]as? NSURL
    print(videoURL!)

    let urlData=NSData(contentsOf: videoURL as! URL)

    if((urlData) != nil)
    {
        let path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
        let documentDirectory = path.first! as NSString
        let fileName = "Video.MOV"
        let PDFPathFileName = documentDirectory.appendingPathComponent(fileName as String)

        print(PDFPathFileName)

        DispatchQueue.main.async( execute: {
            urlData?.write(toFile: PDFPathFileName, atomically: true)
        })

        do {
            let asset = AVURLAsset(url: videoURL as! URL , options: nil)
            let imgGenerator = AVAssetImageGenerator(asset: asset)
            imgGenerator.appliesPreferredTrackTransform = true
            let cgImage = try imgGenerator.copyCGImage(at: CMTimeMake(0, 1), actualTime: nil)
            let thumbnail = UIImage(cgImage: cgImage)
            imgView.image = thumbnail
            // thumbnail here

        } catch let error {
            print("*** Error generating thumbnail: \(error.localizedDescription)")
        }

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

Answer 8

斯威夫特3/4

 func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) { // recover video URL let url = info[UIImagePickerControllerMediaURL] as? URL // check if video is compatible with album let compatible: Bool = UIVideoAtPathIsCompatibleWithSavedPhotosAlbum((url?.path)!) // save if compatible { UISaveVideoAtPathToSavedPhotosAlbum((url?.path)!, self, nil, nil) print("saved!!!! \\(String(describing: url?.path))") } dismiss(animated: true, completion: nil) } // error func video(_ videoPath: String, didFinishSavingWithError error: Error?, contextInfo: UnsafeMutableRawPointer) { } 

保存示例路徑： -

"/private/var/mobile/Containers/Data/Application/EA53C844-7931-446C-800D-DA90717426BB/tmp/xxxxxx.MOV"

Answer 9

只需調用此功能，它將為您完成所有事情:)

    private func saveVideo(url:URL) {
    DispatchQueue.global(qos: .userInitiated).async {
        guard let documentsDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
        if !FileManager.default.fileExists(atPath: documentsDirectoryURL.appendingPathComponent(url.lastPathComponent).path) {
            URLSession.shared.downloadTask(with: url) { (location, response, error) -> Void in
                guard let location = location else { return }
                let destinationURL = documentsDirectoryURL.appendingPathComponent(response?.suggestedFilename ?? url.lastPathComponent)

                do {
                    try FileManager.default.moveItem(at: location, to: destinationURL)
                    PHPhotoLibrary.requestAuthorization({ (authorizationStatus: PHAuthorizationStatus) -> Void in
                        if authorizationStatus == .authorized {
                            PHPhotoLibrary.shared().performChanges({
                                PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: destinationURL)}) { completed, error in
                                    DispatchQueue.main.async {
                                        if completed {
                                            self.view.makeToast(NSLocalizedString("Video Saved!", comment: "Video Saved!"), duration: 3.0, position: .center)
                                        } else {
                                            print(error!)
                                        }
                                    }
                            }
                        }
                    })
                } catch { print(error) }

                }.resume()
        } else {
            print("File already exists at destination url")
        }
    }
}