IOS - UISaveVideoAtPathToSavedPhotosAlbum 如何返回保存的视频路径？

Question

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

    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];


    //get the videoURL 
    NSString *tempFilePath = [videoURL path];


    if ( UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(tempFilePath))
    {
      // Copy it to the camera roll.
      UISaveVideoAtPathToSavedPhotosAlbum(tempFilePath, self, @selector(video:didFinishSavingWithError:contextInfo:), tempFilePath);
    } 
}

我使用 UISaveVideoAtPathToSavedPhotosAlbum 来保存录制的视频。我想知道我保存录制视频的相册中的绝对路径。

我怎样才能得到保存的路径？ UISaveVideoAtPathToSavedPhotosAlbum 不返回任何内容。

并且在回调函数video:didFinishSavingWithError:contextInfo: 中仍然没有路径信息。

Answer 1

据我所知.. 您无法获取相册中保存的视频的路径。如果您希望从您的应用程序重播文件列表。您可以在应用程序中包含所有视频。

以下是您放置在 didFinishPickingMedia 中以将视频存储在辅助文档中的示例代码。这样您就可以跟踪它。

   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
    NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%d", 1]];
    NSString *fileName = [NSString stringWithFormat:@"%@ :%@.%@", itsIncidentType, [dateFormatter stringFromDate:incidentDate], @"mp4"];
    [dateFormatter release];
    if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath])
        [[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error]; //Create folder
    NSURL *videoURL = [imageInfo objectForKey:UIImagePickerControllerMediaURL];
    NSData *webData = [NSData dataWithContentsOfURL:videoURL];
    self.itsVideoName = fileName;
    [webData writeToFile:[NSString stringWithFormat:@"%@/%@",dataPath,fileName] atomically:TRUE];

希望对你有所帮助..

Answer 2

我最近遇到了类似的问题，就这样解决了。

使用两种方法创建 PHAsset 类别

PHAsset+Picking.h

#import <Photos/Photos.h>

@interface PHAsset (Picking)

+ (PHAsset *)retrievePHAssetWithLocalIdentifier:(NSString *)identifier;

+ (void)saveVideoFromCameraToPhotoAlbumWithInfo:(NSDictionary *)info
                                     completion:(void(^)(PHAsset * _Nullable asset))completion;

@end

PHAsset+Picking.m

@implementation PHAsset (Picking)

+ (PHAsset *)retrievePHAssetWithLocalIdentifier:(NSString *)identifier {
    PHAsset *asset = nil;
    if (identifier) {
        PHFetchResult *result = [PHAsset fetchAssetsWithLocalIdentifiers:@[identifier] options:nil];
        asset = result.firstObject;
    }

    return asset;
}

+ (void)saveVideoFromCameraToPhotoAlbumWithInfo:(NSDictionary *)info 
                                     completion:(void(^)(PHAsset * _Nullable asset))completion
{
    // get URL to file from picking media info
    NSURL *url = info[UIImagePickerControllerMediaURL];
    __block PHAssetChangeRequest *changeRequest = nil;
    __block PHObjectPlaceholder *assetPlaceholder = nil;
    // save video file to library
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        changeRequest = [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:url];
        assetPlaceholder = changeRequest.placeholderForCreatedAsset;
    } completionHandler:^(BOOL success, NSError *error) {
        if (success) {
            // get saved object as PHAsset 
            PHAsset *asset = [PHAsset retrievePHAssetWithLocalIdentifier:assetPlaceholder.localIdentifier];
            completion(asset);
        } else {
            completion(nil);
        }
    }];
}

@end

然后在里面使用saveVideoFromCameraToPhotoAlbumWithInfo方法

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    if ([mediaType isEqualToString:(NSString *)kUTTypeMovie]) {
        Weakify(self);
        void (^processAsset)(PHAsset *, NSDictionary *) = ^void(PHAsset *asset, NSDictionary *mediaInfo) {
            [PHImageManager.defaultManager requestAVAssetForVideo:asset
                                                      options:nil
                                                resultHandler:^(AVAsset *asset,
                                                                AVAudioMix *audioMix,
                                                                NSDictionary *assetInfo)
             {
                 Strongify(self);
                 if ([asset respondsToSelector:@selector(URL)]) {

                     // URL to video file here -->
                     NSURL *videoURL = [asset performSelector:@selector(URL)];
                     // <--

                 } else {
                     // asset hasn't property URL
                     // it is can be AVComposition (e.g. user chose slo-mo video)
                 }
             }];
        };

        if (UIImagePickerControllerSourceTypeCamera == picker.sourceType) {
            // save video from camera
            [PHAsset saveVideoFromCameraToPhotoAlbumWithInfo:info completion:^(PHAsset *asset) {
                // processing saved asset
                processAsset(asset, info);
            }];
        } else {
            // processing existing asset from library
            processAsset(info[UIImagePickerControllerPHAsset], info);
        }
    } else {
        // image processing
    }
}