NSURLsession大文件下载-白红宇

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      *)touches withEvent:(UIEvent *)event{    [self download];}-(void)download{    //获取NSURLSession的对象(为了获取下载进度，使用这个方法，执行代理方法,记得遵循代理方法)    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]];    //获取下载任务    NSURLSessionDownloadTask *task = [session downloadTaskWithURL:[NSURL URLWithString:@""]];    //启动下载任务    [task resume];}#pragma mark -- NSURLSessionDownloadDelegate代理方法 ---(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{}//继续下载-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes{}/** *  正在下载（每当写入临时文件时就调用一次） *  @param bytesWritten              这次写入多少 *  @param totalBytesWritten         已经写入大小 *  @param totalBytesExpectedToWrite 总大小 */-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite{}//下载完毕的时候调用一次-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location{    //文件将来存放的真是路径    NSString *file = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject] stringByAppendingPathComponent:downloadTask.response.suggestedFilename];    //剪切文件到真是路径    NSFileManager *mager = [NSFileManager defaultManager];        [mager moveItemAtURL:location toURL:[NSURL fileURLWithPath:file] error:nil];    }复制代码