无法将视频保存到相机胶卷（目标C）

Question

所以我一直试图在相当长的一段时间内完成这项工作，但不幸的是，堆栈上发布的解决方案或我试图自己编写的解决方案似乎都没有。我正在构建一个允许用户拍摄照片和视频的应用程序，以及其他用户将其保存下来。我正在使用AWS服务来保存内容。尽管返回的URL使用NSLog，但在将其复制/粘贴到浏览器时向我显示视频，它拒绝保存到相机胶卷。保存图片但工作正常。

到目前为止我尝试了以下内容：

    -(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
        if([mediaType isEqualToString:(NSString *)kUTTypeMovie]) {
           NSURL *movieUrl = [info objectForKey:UIImagePickerControllerMediaURL];
           ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
           [library writeVideoAtPathToSavedPhotosAlbum:movieUrl completionBlock:^(NSURL *assetURL, NSError *error){
           if(error) {
            NSLog(@"CameraViewController: Error on saving movie : %@ {imagePickerController}", error);
         } else {
            NSLog(@"URL: %@", assetURL);
        }
     }];
  }
}  

并且：

    if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(self.post.mediaUrl)) {
            UISaveVideoAtPathToSavedPhotosAlbum(self.post.mediaUrl, self, @selector(video:finishedSavingWithError:contextInfo:),@selector(video:finishedSavingWithError:contextInfo:));
    } else {
        NSLog(@"Incompatible File apparently");
    }

有什么建议？谢谢！

Answer 1

*于2016年4月6日更新，以利用现代框架

无论您在何处放置此方法，都可以导入以下内容：

#import <AssetsLibrary/AssetsLibrary.h>
@import Photos

然后调用方法如下：

[yourClass saveMedia:(*your image*) video:(*your video url*)]

希望这有助于人们，随时回答问题。

+ (void)saveMedia:(UIImage *)image video:(NSURL *)video_url {
    if(image) {
        if(!image) {
            return;
        }

    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        PHAssetChangeRequest *changeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
        NSLog(@"%@", changeRequest.description);
    } completionHandler:^(BOOL success, NSError *error) {
        if (success) {
            NSLog(@"saved down");
        } else {
            NSLog(@"something wrong");
        }
    }];
} else if (video_url) {
    if([video_url absoluteString].length < 1) {
        return;
    }

    NSLog(@"source will be : %@", video_url.absoluteString);
    NSURL *sourceURL = video_url;

    if([[NSFileManager defaultManager] fileExistsAtPath:[video_url absoluteString]]) {
        [[[ALAssetsLibrary alloc] init] writeVideoAtPathToSavedPhotosAlbum:video_url completionBlock:^(NSURL *assetURL, NSError *error) {

            if(assetURL) {
                NSLog(@"saved down");
            } else {
                NSLog(@"something wrong");
            }
        }];

    } else {

        NSURLSessionTask *download = [[NSURLSession sharedSession] downloadTaskWithURL:sourceURL completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) {
            if(error) {
                NSLog(@"error saving: %@", error.localizedDescription);
                return;
            }

            NSURL *documentsURL = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] firstObject];
            NSURL *tempURL = [documentsURL URLByAppendingPathComponent:[sourceURL lastPathComponent]];

            [[NSFileManager defaultManager] moveItemAtURL:location toURL:tempURL error:nil];

            [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
                PHAssetChangeRequest *changeRequest = [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:tempURL];

                NSLog(@"%@", changeRequest.description);
            } completionHandler:^(BOOL success, NSError *error) {
                if (success) {
                    NSLog(@"saved down");
                    [[NSFileManager defaultManager] removeItemAtURL:tempURL error:nil];
                } else {
                    NSLog(@"something wrong %@", error.localizedDescription);
                    [[NSFileManager defaultManager] removeItemAtURL:tempURL error:nil];
                }
            }];
        }];
        [download resume];
    }
   }
}

Answer 2

在Objective - C中

在.h / .m文件中添加

#import <Photos/Photos.h>

将视频保存到相机胶卷：

 [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
                        [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:videoUrl];
                    }
                    completionHandler:^(BOOL success, NSError *error) {
                        if (success)
                        {
                            NSLog(@"Video saved");
                        }else{
                            NSLog(@"%@",error.description);
                        }
                    }];