Question

我最近更新了AFNetworking 2.0。该文档称它与iOS6.0 +兼容。当我尝试实现下载方法（图像和视频）时，我正在构建iOS 6.0应用程序。示例使用

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

然而，我得到了一个＆＃34;使用未声明的标识符＆＃39; AFURLSessionManager＆＃39;＆＃34;错误。我发现AFURLSessionManager使用的是只能从iOS7获得的类。我只是想知道，我可以使用AFNetworking在iOS6下载谁？

另外，有没有看到下载进度？

谢谢

Answer 1

您可以使用AFHTTPRequestOperation类在iOS 6上执行文件下载。您基本上只需要设置操作的outputStream属性来存储文件和downloadProgressBlock属性来监控进步。

下面的裸骨方法是在AFHTTPRequestOperationManager的子类的类中声明的。当我初始化这个类的实例时，我设置了baseURL属性。

- (AFHTTPRequestOperation *)downloadFileWithContentId:(NSString *)contentId destination:(NSString*)destinationPath {

    NSString *relativeURLString = [NSString stringWithFormat:@"api/library/zipped/%@.zip", contentId];
    NSString *absoluteURLString = [[NSURL URLWithString:relativeURLString relativeToURL:self.baseURL] absoluteString];

    NSMutableURLRequest *request = [self.requestSerializer requestWithMethod:@"GET" URLString:absoluteURLString parameters:nil];

    void (^successBlock)(AFHTTPRequestOperation *operation, id responseObject) = ^void(AFHTTPRequestOperation *operation, id responseObject) {

    };

    void (^failureBlock)(AFHTTPRequestOperation *operation,  NSError *error) = ^void(AFHTTPRequestOperation *operation,  NSError *error) {

    };

    AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithRequest:request success:successBlock failure:failureBlock];

    NSOutputStream *outputStream = [NSOutputStream outputStreamToFileAtPath:destinationPath append:NO];
    operation.outputStream = outputStream;

    [operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {

    }];

    [self.operationQueue addOperation:operation];

    return operation;
}

Answer 2

正如您所说AFURLSessionManager仅在iOS 7中可用（由NSURLSession支持），因此您应该使用AFNetworking 2.0中基于NSURLConnection的类（AFHTTPRequestOperationManager， AFHTTPRequestOperation等。）

Answer 3

试试这个......

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

manager.responseSerializer = [AFHTTPResponseSerializer serializer];

AFHTTPRequestOperation *operation = [manager GET:urlString
                                      parameters:nil
                                         success:^(AFHTTPRequestOperation *operation, NSData *responseData)
                                     {
                                         [responseData writeToURL:someLocalURL atomically:YES];
                                     }
                                         failure:^(AFHTTPRequestOperation *operation, NSError *error)
                                     {
                                         NSLog(@"Downloading error: %@", error);
                                     }];

[operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead)
 {
     float downloadPercentage = (float)totalBytesRead/(float)(totalBytesExpectedToRead);

     [someProgressView setProgress:downloadPercentage animated:YES];
 }];

在iOS 6上使用AFNetworking下载文件

3 个答案: