AFNetworking 1.x到3.x迁移到NSURLSessionTask？

Question

我有一个在iOS 9中不起作用的旧项目，我阅读了AFNetworking上的正式文档，并完成了大部分迁移。

NetworkManager：

_requestManager = [[AFHTTPSessionManager alloc]initWithBaseURL:[NSURL URLWithString:baseURL ]];
//here we can set the request header as the access token once we have logged in.
AFHTTPRequestSerializer *requestSerializer = [AFHTTPRequestSerializer serializer];
AFHTTPResponseSerializer *responseSerializer = [AFHTTPResponseSerializer serializer];
[_requestManager setRequestSerializer:requestSerializer];
[_requestManager setResponseSerializer:responseSerializer];

较早版本：

// 2. Create an `NSMutableURLRequest`.
NSMutableURLRequest *request =
    [[NetworkManager sharedInstance].requestManager.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:fullPath
                                                                                          parameters:nil
                                                                           constructingBodyWithBlock: ^(id <AFMultipartFormData> formData) {
    NSString *fileName = [NSString stringWithFormat:@"%@.caf", theAudioItem.media_item_name];
    [formData appendPartWithFileData:audioData name:theAudioItem.media_item_name fileName:fileName mimeType:@"audio/caf"];
}];

// 3. Create and use `AFHTTPRequestOperationManager` to create an `AFHTTPRequestOperation` from the `NSMutableURLRequest` that we just created.
AFHTTPRequestOperation *operation =
    [[NetworkManager sharedInstance].requestManager HTTPRequestOperationWithRequest:request
                                                                            success: ^(AFHTTPRequestOperation *operation, id responseObject) {
    result(YES, @"");
} failure: ^(AFHTTPRequestOperation *operation, NSError *error) {
    if (operation.responseData) {
        NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData:operation.responseData options:NSJSONReadingMutableContainers error:nil];

        result(NO, [responseDict valueForKey:@"Message"]);
        [self deleteTmpFilesFromParts:formParts];
    } else {
        result(NO, [NSString stringWithFormat:@"Failed to upload media to %@!", gallery.gallery_name]);
        [self deleteTmpFilesFromParts:formParts];
    }


    result(NO, errorMessage);
}];

// 4. Set the progress block of the operation.
[operation setUploadProgressBlock: ^(NSUInteger __unused bytesWritten,
                                     long long totalBytesWritten,
                                     long long totalBytesExpectedToWrite) {
    DLog(@"progress is %i %lld %lld", bytesWritten, totalBytesWritten, totalBytesExpectedToWrite);
    progress((float)totalBytesWritten / (float)totalBytesExpectedToWrite);
}];

// 5. Begin!
[operation start];

转换后的响应：(通过注释更新产生错误的内容)

//No visible @interface for 'AFHTTPRequestSerializer<AFURLRequestSerialization>' declares the selector 'multipartFormRequestWithMethod:URLString:parameters:constructingBodyWithBlock:'
    NSMutableURLRequest *request =
        [[NetworkManager sharedInstance].requestManager.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:fullPath parameters:nil
                                                                               constructingBodyWithBlock: ^(id <AFMultipartFormData> formData) {
        NSString *fileName = [NSString stringWithFormat:@"%@.caf", theAudioItem.media_item_name];
        [formData appendPartWithFileData:audioData name:theAudioItem.media_item_name fileName:fileName mimeType:@"audio/caf"];
    }];

    // 3. Create and use `AFHTTPRequestOperationManager` to create an `AFHTTPRequestOperation` from the `NSMutableURLRequest` that we just created.
   //No visible @interface for 'AFHTTPSessionManager' declares the selector 'HTTPRequestOperationWithRequest:success:failure:'
    NSURLSessionTask *operation =
        [[NetworkManager sharedInstance].requestManager HTTPRequestOperationWithRequest:request
                                                                                success: ^(NSURLSessionTask *operation, id responseObject) {
        result(YES, @"");
    } failure: ^(NSURLSessionTask *operation, NSError *error) {

        //Error for operation doesn't have responseData
        if (operation.responseData) {
            NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData:operation.responseData options:NSJSONReadingMutableContainers error:nil];

            result(NO, [responseDict valueForKey:@"Message"]);
            [self deleteTmpFilesFromParts:formParts];
        } else {
            result(NO, [NSString stringWithFormat:@"Failed to upload media to %@!", gallery.gallery_name]);
            [self deleteTmpFilesFromParts:formParts];
        }

        // get the response
        result(NO, errorMessage);
    }];

    // 4. Set the progress block of the operation.
    //No visible @interface for 'NSURLSessionTask' declares the selector 'setUploadProgressBlock:'
    [operation setUploadProgressBlock: ^(NSUInteger __unused bytesWritten,
                                         long long totalBytesWritten,
                                         long long totalBytesExpectedToWrite) {
        DLog(@"progress is %i %lld %lld", bytesWritten, totalBytesWritten, totalBytesExpectedToWrite);
        progress((float)totalBytesWritten / (float)totalBytesExpectedToWrite);
    }];

    // 5. Begin!
    //No visible @interface for 'NSURLSessionTask' declares the selector 'start'
    [operation start];

Answer 1

AFHTTPSessionManager的等效代码是：

NSURLSessionTask *task = [[[NetworkManager sharedInstance] requestManager] POST:fullPath parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
    NSString *fileName = [NSString stringWithFormat:@"%@.caf", theAudioItem.media_item_name];
    [formData appendPartWithFileData:audioData name:theAudioItem.media_item_name fileName:fileName mimeType:@"audio/caf"];
} progress:^(NSProgress * _Nonnull uploadProgress) {
    NSLog(@"%.3f", uploadProgress.fractionCompleted);
} success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
    // success
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
    // failure

    // if you need to process the `NSData` associated with this error (if any), you'd do:

    NSData *data = error.userInfo[AFNetworkingOperationFailingURLResponseDataErrorKey];
    if (data) { ... }
}];

这包含了v1.x代码中的两个主要更改:第一，在2.x中引入了GET/POST/etc，这些方法帮助您避免手动启动操作(或将其添加到您自己的队列中)。其次，在3.x中，他们退出了NSOperation框架的AFHTTPRequestOperationManager，现在使用AFHTTPSessionManager类，其中GET/POST/etc。不要返回NSOperation子类，而是返回NSURLSessionTask引用。