NSURLsession大文件下载

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-(void)touchesBegan:(NSSet *)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];
    

}