AFNetworking的POST上传

1. - (void)download {
2. // 1.创建网络管理者
3. // AFHTTPSessionManager 基于NSURLSession
4. AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
5. // 2.利用网络管理者下载数据
6. NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"]];
7. /*
8. destination
9. - targetPath: 系统给我们自动写入的文件路径
10. - block的返回值, 要求返回一个URL, 返回的这个URL就是剪切的位置的路径
11. completionHandler
12. - url :destination返回的URL
13. */
14. /*
15. @property int64_t totalUnitCount; 需要下载文件的总大小
16. @property int64_t completedUnitCount; 当前已经下载的大小
17. */
18. NSProgress *progress = nil;
19. NSURLSessionDownloadTask *task = [manager downloadTaskWithRequest:request progress:&progress destination:^ NSURL * (NSURL * targetPath, NSURLResponse * response) {
20. NSLog(@"targetPath = %@", targetPath.absoluteString);
22. NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
23. NSString *toPath = [path stringByAppendingPathComponent:response.suggestedFilename];
24. NSLog(@"toPath = %@", toPath);
25. return [NSURL fileURLWithPath:toPath];
27. } completionHandler:^ void(NSURLResponse * response, NSURL * url, NSError * error) {
28. // NSLog(@"下载完毕 url = %@", url.absoluteString);
29. }];
31. // 给Progress添加监听 KVO
32. [progress addObserver:self forKeyPath:@"completedUnitCount" options:NSKeyValueObservingOptionNew context:nil];
34. // 3.启动任务
35. [task resume];
37. NSLog(@"%lld, %lld", progress.totalUnitCount, progress.completedUnitCount);
38. }
40. - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(NSProgress *)progress change:(NSDictionary *)change context:(void *)context {
41. // NSLog(@"%lld, %lld", progress.totalUnitCount, progress.completedUnitCount);
42. NSLog(@"%f", 1.0 * progress.completedUnitCount / progress.totalUnitCount);
43. }

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