pod 'BaiduBCEReader', '~> 2.3.3'

// 假设self是一个UIViewController对象。
self.reader = [BCEDocumentReader alloc] initWithFrame:frame];
self.reader.delegate = self;
[self.view addSubview:self.reader];

NSDictionary* parameters = @{
    BDocPlayerSDKeyDocID: @"<docId>",
    BDocPlayerSDKeyToken: @"<token>",
    BDocPlayerSDKeyHost: @"<host>",
    BDocPlayerSDKeyDocType: @"<docType>",
    BDocPlayerSDKeyTotalPageNum: @"<totalPageNum>",
    BDocPlayerSDKeyDocTitle: @"<title>",
    BDocPlayerSDKeyPageNumber : @(<startPageNum>)
};

NSError* error;
[self.reader loadDoc:parameters error:&error];

self.downloader = [[BCEDocumentDownloader alloc] initWithUser:@"baidu" delegate:self];

- (void)task:(BCEDocumentDownloadTask*)task 
		needAuthentication:(NSMutableDictionary*)parameters {
	[parameters setObject:@"<token>" forKey:BDocPlayerSDKeyToken]; 
}

NSError* error;
BCEDocumentDownloadTask* task = [self.downloader downloadTask:parameters error:&error];
[self.tasks addObject:task];

/**
 *  @brief 指定用户名、代理和存储路径进行初始化。在没有账户系统时，用户可指定默认值。存储路径为空时，文档数据存储在SDK默认存储路径Cache目录下。
 *  @param user     用户名。
 *  @param delegate 代理。
 *  @param path     文档数据存储路径。
 *  @return 下载管理器。
 */
 
objectivec
- (instancetype)initWithUser:(NSString*)user
                    delegate:(id<BCEDocumentDownloaderDelegate>)delegate
                     storage:(NSString*)path;

NSDictionary* parmaeters = task.item.parameters;

NSDictionary* parmaeters;
NSArray<BCEDocumentItem*>* documents = [self.downloader documents];
for (BCEDocumentItem* document in documents) {
	if (document.state == BCEDocumentItemStatusReady 
		&& [document.identify isEqualToString:@"<docId>"]) {
		parmaeters = document.parameters;
	}
}

NSError* error;
[self.reader loadDoc:parameters error:&error];