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