无法将视频保存到相机胶卷（目标 C）

Question

所以我已经尝试了很长一段时间了，但不幸的是，堆栈上发布的解决方案都没有，或者我自己尝试编写的解决方案似乎都不起作用。我正在构建一个应用程序，允许用户拍摄照片和视频，并让其他用户保存下来。我正在使用 AWS 服务来保存内容。尽管使用 NSLog 返回的 URL 在将视频复制/粘贴到浏览器时向我显示了视频，但它拒绝保存到相机胶卷。但是保存图片效果很好。

到目前为止，我尝试了以下方法：

    -(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);
        }
     }];
  }
}  

还有：

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

有什么建议吗？谢谢！

Answer 1

*2016 年 4 月 6 日更新以利用现代框架

在您放置此方法的任何位置导入以下内容：

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

然后调用方法如下：

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

希望这对人们有所帮助，请随时发表评论。

+ (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

在目标中 - C

将此添加到 .h/.m 文件中

#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);
                        }
                    }];