AFNetworking 下载文件断点续传操作

一：本示例代码包括：

• 文件下载，写入指定目录
• 下载进度，回调Progress;
• 断点续传，下载暂停，继续操作；

二：本项目 适用于 AFNetworking 1.x 版本

 #pragma mark 断点续传下载；

     //断点下载续传--需要服务器端的支持，本次测试为下载百度音乐，此接口，会在第二次暂停，继续下载时，出404错误；

     //进度
     UIProgressView  *downProgressView = [[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleDefault];
     downProgressView.center = CGPointMake(self.view.center.x, );
     downProgressView.progress = ;
     downProgressView.progressTintColor = [UIColor blueColor];
     downProgressView.trackTintColor = [UIColor grayColor];
     [self.view addSubview:downProgressView];

     //开始
     UIButton *start = [UIButton buttonWithType:UIButtonTypeRoundedRect];
     start.frame = CGRectMake(, , , );
     [start setTitle:@"开始" forState:UIControlStateNormal];
     [start addTarget:self action:@selector(startDownloadOp) forControlEvents:UIControlEventTouchUpInside];

     //暂停
     UIButton *pause = [UIButton buttonWithType:UIButtonTypeRoundedRect];
     pause.frame = CGRectMake(, , , );
     [pause setTitle:@"暂停" forState:UIControlStateNormal];
     [pause addTarget:self action:@selector(pausetDownloadOp) forControlEvents:UIControlEventTouchUpInside];

     //继续
     UIButton *resume = [UIButton buttonWithType:UIButtonTypeRoundedRect];
     resume.frame = CGRectMake(, , , );
     [resume setTitle:@"继续" forState:UIControlStateNormal];
     [resume addTarget:self action:@selector(resumeDownloadOp) forControlEvents:UIControlEventTouchUpInside];

     [self.view addSubview:start];
     [self.view addSubview:pause];
     [self.view addSubview:resume];

     //文件名
     NSString *fileName = [NSString stringWithFormat:@"%@愿得一人听.mp3",NSTemporaryDirectory()];
     NSLog(@"%@",fileName);

     //下载
     NSURLRequest *downloadRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:MusicOne]];
     self.downloadMusicOP = [[AFHTTPRequestOperation alloc]initWithRequest:downloadRequest];
     _downloadMusicOP.outputStream = [NSOutputStream outputStreamToFileAtPath:fileName append:NO];

     [_downloadMusicOP setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
         CGFloat progress = ((float)totalBytesRead) / totalBytesExpectedToRead;
         [downProgressView setProgress:progress animated:YES];
         start.enabled = NO;
         [start setTitle:@"下载中" forState:UIControlStateNormal];
     }];

     [_downloadMusicOP setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
         start.enabled = NO;
         [start setTitle:@"完成" forState:UIControlStateNormal];
         NSLog(@"download finish");
         NSLog(@"%@",[[NSFileManager defaultManager] contentsOfDirectoryAtPath:NSTemporaryDirectory() error:nil]);

     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"error %@",error);
     }];

 }

 #pragma mark AFNetworking 下载之断点续传；

 - (void)startDownloadOp
 {
     [_downloadMusicOP start];
 }

 - (void)pausetDownloadOp
 {
     [_downloadMusicOP pause];
 }

 - (void)resumeDownloadOp
 {
     [_downloadMusicOP resume];
 }

项目代码：http://git.oschina.net/cocoajin/AFNetworkingTest