iOS实现大文件下载功能：TCBlobDownload
jopen
10年前
实现大文件下载功能，可以在后台线程（background threads）进行文件下载，不会给前台线程操作造成影响。支持暂停和重新恢复下载。作者测试过150MB ~ 1.2GB之间的大文件下载。
代码图2是App在下载文件时，在Xcode输出框的输出文字。
具体功能特色如下：
1. 在后台线程下载大文件；
2. 使用 blocks 或者 delegate 模式；
3. 可以暂停和重新恢复下载；
4. 可以设置能够下载的最大文件的大小；
5. 下载过程中可以取消下载，并且删除掉已经下载的部分文件；
- (TCBlobDownload *)startDownloadWithURL:(NSURL *)url downloadPath:(NSString *)customPathOrNil andDelegate:(id<TCBlobDownloadDelegate>)delegateOrNil; - (TCBlobDownload *)startDownloadWithURL:(NSURL *)url downloadPath:(NSString *)customPathOrNil firstResponse:(void (^)(NSURLResponse *response))firstResponseBlock progress:(void (^)(float receivedLength, float totalLength))progressBlock error:(void (^)(NSError *error))errorBlock complete:(void (^)(BOOL downloadFinished, NSString *pathToFile))completeBlock; - (void)startDownload:(TCBlobDownload *)blobDownload; - (void)setDefaultDownloadDirectory:(NSString *)pathToDL; - (void)setMaxConcurrentDownloads:(NSInteger)max; - (NSUInteger)downloadCount; - (void)cancelAllDownloadsAndRemoveFiles:(BOOL)remove;
- (id)initWithUrl:(NSURL *)url downloadPath:(NSString *)pathToDL // cannot be nil andDelegate:(id<TCBlobDownloadDelegate>)delegateOrNil; - (id)initWithUrl:(NSURL *)url downloadPath:(NSString *)pathToDL // cannot be nil firstResponse:(void (^)(NSURLResponse *response))firstResponseBlock progress:(void (^)(float receivedLength, float totalLength))progressBlock error:(void (^)(NSError *error))errorBlock complete:(void (^)(BOOL downloadFinished, NSString *pathToFile))completeBlock; - (void)cancelDownloadAndRemoveFile:(BOOL)remove; - (void)addDependentDownload:(TCBlobDownload *)blobDownload
