iOS實現大文件下載功能：TCBlobDownload

jopen 11年前發布 | 38K 次閱讀 iOS開發移動開發 TCBlobDownload

實現大文件下載功能，可以在后臺線程（background threads）進行文件下載，不會給前臺線程操作造成影響。支持暫停和重新恢復下載。作者測試過150MB ~ 1.2GB之間的大文件下載。
代碼圖2是App在下載文件時，在Xcode輸出框的輸出文字。
具體功能特色如下：
1. 在后臺線程下載大文件；
2. 使用 blocks 或者 delegate 模式；
3. 可以暫停和重新恢復下載；
4. 可以設置能夠下載的最大文件的大小；
5. 下載過程中可以取消下載，并且刪除掉已經下載的部分文件；

- (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