code

        NSFileManager *fileManage = [NSFileManager defaultManager];
        NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:videoUrl]];
          
        if (data == nil)
        {
            NSLog(@"网络出错,请稍后再试");
        }
        else
        {
            //用单例类  NSFileManager的对象,将文件写入本地
            BOOL isSuccess = [fileManage createFileAtPath:path contents:data attributes:nil];
            if (isSuccess)
            {
                NSLog(@"视频下载成功");
                // 保存视频到相册
                ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
                [library writeVideoAtPathToSavedPhotosAlbum:[NSURL fileURLWithPath:path]
                   
                                            completionBlock:^(NSURL *assetURL, NSError *error) {
                                                  
                                                if (error) {
                                                      
                                                    NSLog(@"Save video fail:%@",error);
                                                      
                                                } else {
                                                    //2018-09-13 20:03:33.870 WeChat[6484:1077151] [MMVideoCompressHelper getCacheFilePathFrom:file:///var/mobile/Media/DCIM/100APPLE/IMG_0041.mp4 ]
                                                    NSLog(@"Save video succeed.:%@",assetURL);//assets-library://asset/asset.mp4?id=45C3D675-C625-4C52-B133-66D0A709AC57&ext=mp4
                                                      
                                                    // 获取相册的最新一条视频的path，进行SightDraft的创建
                                                      
                                                }
                                                  
                                            }];
            }
            else
            {
                NSLog(@"视频下载失败");
            }
  
writeVideoAtPathToSavedPhotosAlbum

使用dataWithContentsOfURL进行视频下载，并保存到相册；以便提供给其他app进行加载使用

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