HYDownloadManager

一个工具，用于文件下载，具有内存缓存、临时缓存和永久存储。

如何使用

• 并行下载：HYDownloadManager

//Start the download request for a URL, note that the same URL will never be downloaded twice
+ (void) downloadItemWithURL:(NSURL*)url
                    useCache:(BOOL)useCache;

//Delegate based events
// 1 url download operation can have multiple listeners
// But 1 listener cannot listen to 1 url download operation
+ (void) attachListener:(id<HYDownloadManagerDelegate>)listener toURL:(NSURL*)url;

• 顺序下载：HYSequentialDownloadHandler

+ (HYSequentialDownloadHandler*) downloadingHandlerWithURLs:(NSArray*)urls
                                              progressBlock:(HYSequentialProgressBlock)progressBlock
                                            completionBlock:(HYSequentialCompletionBlock)completionBlock
                                                        tag:(NSInteger)tag;