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
1 #pragma mark 断点续传下载； 2 3 //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； 4 5 //进度 6 UIProgressView *downProgressView = [[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleDefault]; 7 downProgressView.center = CGPointMake(self.view.center.x, 20); 8 downProgressView.progress = 0; 9 downProgressView.progressTintColor = [UIColor blueColor]; 10 downProgressView.trackTintColor = [UIColor grayColor]; 11 [self.view addSubview:downProgressView]; 12 13 //开始 14 UIButton *start = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 15 start.frame = CGRectMake(25, 40, 80, 30); 16 [start setTitle:@"开始" forState:UIControlStateNormal]; 17 [start addTarget:self action:@selector(startDownloadOp) forControlEvents:UIControlEventTouchUpInside]; 18 19 //暂停 20 UIButton *pause = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 21 pause.frame = CGRectMake(125, 40, 80, 30); 22 [pause setTitle:@"暂停" forState:UIControlStateNormal]; 23 [pause addTarget:self action:@selector(pausetDownloadOp) forControlEvents:UIControlEventTouchUpInside]; 24 25 //继续 26 UIButton *resume = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 27 resume.frame = CGRectMake(220, 40, 80, 30); 28 [resume setTitle:@"继续" forState:UIControlStateNormal]; 29 [resume addTarget:self action:@selector(resumeDownloadOp) forControlEvents:UIControlEventTouchUpInside]; 30 31 [self.view addSubview:start]; 32 [self.view addSubview:pause]; 33 [self.view addSubview:resume]; 34 35 //文件名 36 NSString *fileName = [NSString stringWithFormat:@"%@愿得一人听.mp3",NSTemporaryDirectory()]; 37 NSLog(@"%@",fileName); 38 39 //下载 40 NSURLRequest *downloadRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:MusicOne]]; 41 self.downloadMusicOP = [[AFHTTPRequestOperation alloc]initWithRequest:downloadRequest]; 42 _downloadMusicOP.outputStream = [NSOutputStream outputStreamToFileAtPath:fileName append:NO]; 43 44 [_downloadMusicOP setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) { 45 CGFloat progress = ((float)totalBytesRead) / totalBytesExpectedToRead; 46 [downProgressView setProgress:progress animated:YES]; 47 start.enabled = NO; 48 [start setTitle:@"下载中" forState:UIControlStateNormal]; 49 }]; 50 51 [_downloadMusicOP setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { 52 start.enabled = NO; 53 [start setTitle:@"完成" forState:UIControlStateNormal]; 54 NSLog(@"download finish"); 55 NSLog(@"%@",[[NSFileManager defaultManager] contentsOfDirectoryAtPath:NSTemporaryDirectory() error:nil]); 56 57 } failure:^(AFHTTPRequestOperation *operation, NSError *error) { 58 NSLog(@"error %@",error); 59 }]; 60 61 62 63 64 65 } 66 67 #pragma mark AFNetworking 下载之断点续传； 68 69 - (void)startDownloadOp 70 { 71 [_downloadMusicOP start]; 72 } 73 74 - (void)pausetDownloadOp 75 { 76 [_downloadMusicOP pause]; 77 } 78 79 - (void)resumeDownloadOp 80 { 81 [_downloadMusicOP resume]; 82 }