如何使用 AFNetworking 2.0 下载文件

Question

我很难筛选搜索结果以了解如何执行此操作，并且在文档中找不到任何具体内容。我只想下载一个文件并存储在 Documents 目录中。该文件的类型为 .plist，但我不需要解析 plist。就像我说的，我只需要将它保存到磁盘。

我是否为此使用 AFHTTPRequestOperationManager？

这是我一直在尝试的一般方法：

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    //manager.responseSerializer = [AFPropertyListResponseSerializer serializer];
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];

    [manager GET:url parameters:nil
         success:^(AFHTTPRequestOperation *operation, id responseObject) {
             DLog(@"downloaded plist");
         }
         failure:^(AFHTTPRequestOperation *operation, NSError *error) {
             DLog(@"JSON DataError: %@", error);
         }];

如果我使用 AFHTTPResponseSerializer 我得到这个：

Error Domain=AFNetworkingErrorDomain Code=-1011 "Request failed: internal server error (500)"

如果我使用 AFPropertyListResponseSerializer 我会得到：

Error Domain=AFNetworkingErrorDomain Code=-1016 "Request failed: unacceptable content-type: text/plain"

但我什至不确定我使用的是正确的 API。

Answer 1

请试试这个例子。 希望这有帮助！

// Step 1: create NSURL with full path to downloading file
// for example try this: NSString *fileUrl = @"https://pbs.twimg.com/profile_images/2331579964/jrqzn4q29vwy4mors75s_400x400.png";
// And create NSURLRequest object with our URL
NSURL *URL = [NSURL URLWithString:fileUrl];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];

// Step 2: save downloading file's name
// For example our fileName string is equal to 'jrqzn4q29vwy4mors75s_400x400.png'
NSString *fileName = [URL lastPathComponent];

// Step 3: create AFHTTPRequestOperation object with our request
AFHTTPRequestOperation *downloadRequest = [[AFHTTPRequestOperation alloc] initWithRequest:request];

// Step 4: set handling for answer from server and errors with request
[downloadRequest setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
            // here we must create NSData object with received data...
            NSData *data = [[NSData alloc] initWithData:responseObject];
            // ... and save this object as file
            // Here 'pathToFile' must be path to directory 'Documents' on your device + filename, of course
            [data writeToFile:pathToFile atomically:YES];
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            NSLog(@"file downloading error : %@", [error localizedDescription]);
        }];

// Step 5: begin asynchronous download
[downloadRequest start];

其他：What's the best way to find the user's Documents directory on an iPhone?