iOS实现视频下载并自动保存到相册功能

///@property (nonatomic,strong) MBProgressHUD *hud;@property (nonatomic,strong) NSURLSession *session;///视频播放和下载用的url @property (nonatomic,strong) NSURL *url;

///初始化session- (NSURLSession *)session{ if(_session == nil) { NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration]; _session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:nil]; } return _session;}///下载- (void)download:(UIBarButtonItem *)btnItem{ ///初始化Session _session = [XMConciseVedioPlayer getSession:_session];  ///self.hud = [MBProgressHUD showHUDAddedTo:self animated:YES];  [self downloadFileWithUrl:self.url]; }///通过url下载- (void)downloadFileWithUrl:(NSURL *)url{ NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:1.0 timeoutInterval:5.0]; ///下载任务 [[self.session downloadTaskWithRequest:request]resume];  NSURLSessionDownloadTask *task = [_session downloadTaskWithURL:url completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) { ///[self.hud setLabelText:[NSString stringWithFormat:@"下载成功"]]; NSFileManager *fileManger = [NSFileManager defaultManager]; ///沙盒Documents路径 NSString *documents = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; //拼接文件绝对路径 NSString *path = [documents stringByAppendingPathComponent:response.suggestedFilename]; //视频存放到这个位置 [fileManger moveItemAtURL:location toURL:[NSURL fileURLWithPath:path] error:nil]; ///保存到相册 UISaveVideoAtPathToSavedPhotosAlbum(path, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);  }]; ///开始下载任务 [task resume]; }//保存视频完成之后的回调- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo { if (!error) { ///[self.hud setLabelText:[NSString stringWithFormat:@"保存到相册成功"]]; } else { ///[self.hud setLabelText:[NSString stringWithFormat:@"下载失败"]]; } ///[self.hud hide:YES afterDelay:3.0];}// 进度数据- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite{ float progress = (float)totalBytesWritten / totalBytesExpectedToWrite; long pro = (long)(progress *100); ///[self.hud setLabelText:[NSString stringWithFormat:@"下载进度:%ld%%",pro]];}