AFNetworking：OC，✩33.1k
Alamofire：Swift，✩35.3k

1. AFNetworking

cd到工程目录:

cd /Users/kang/Desktop/AFNetworking_Demo_OC

创建 Podfile 文件:

touch Podfile

使用vim编辑文件（或者直接双击文件打开编辑）：

vim Podfile

键入i，进入输入模式，输入内容：

platform :ios, '10.0'

target 'AFNetworking_Demo_OC' do
        pod 'AFNetworking'
end

按Esc退出输入模式，然后:wq保存并退出。
接着执行update操作，等待下载第三方库:

pod update

于是乎：

AFNetworking

如需开启HTTP，需在info.plist添加如下配置：

    <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>

下面开始撸代码。

1.1 Data Task

- (void)dataTask {
    
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

    NSURL *URL = [NSURL URLWithString:@"http://httpbin.org/get"];
    NSURLRequest *request = [NSURLRequest requestWithURL:URL];
    
    NSURLSessionDataTask *dataTask = [manager dataTaskWithRequest:request
                                                   uploadProgress:nil
                                                 downloadProgress:nil
                                                completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
        if (error) {
            NSLog(@"Error: %@", error);
        } else {
            NSLog(@"response: %@", responseObject);
            NSLog(@"responseObject: %@", responseObject);
        }
    }];
    
    [dataTask resume];
}

1.2 Upload Task

- (void)uploadTask {
    
    // 要上传的数据
    NSData *uploadData = [@"test123" dataUsingEncoding:NSUTF8StringEncoding];
    
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

    NSURL *URL = [NSURL URLWithString:@"http://httpbin.org/post"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
    request.HTTPMethod = @"POST";

    NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithRequest:request
                                                               fromData:uploadData
                                                               progress:nil
                                                      completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
        if (error) {
            NSLog(@"Error: %@", error);
        } else {
            NSLog(@"response: %@", responseObject);
            NSLog(@"responseObject: %@", responseObject);
        }
    }];

    [uploadTask resume];
}

1.3 Upload Task for a Multi-Part Request

- (void)uploadTaskMulti {
    
    NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST"
                                                                                              URLString:@"http://httpbin.org/post"
                                                                                             parameters:nil
                                                                              constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        // 要上传的数据
//        NSData *uploadData1 = [@"data1" dataUsingEncoding:NSUTF8StringEncoding];
//        NSData *uploadData2 = [@"data2" dataUsingEncoding:NSUTF8StringEncoding];
//        [formData appendPartWithFileData:uploadData1 name:@"data1" fileName:@"data1" mimeType:@"text/plain"];
//        [formData appendPartWithFileData:uploadData2 name:@"data2" fileName:@"data2" mimeType:@"text/plain"];
        // 要上传的数据
        NSString *imagePath1 = [[NSBundle mainBundle] pathForResource:@"image1" ofType:@"png"];
        NSString *imagePath2 = [[NSBundle mainBundle] pathForResource:@"image2" ofType:@"png"];
        [formData appendPartWithFileURL:[NSURL fileURLWithPath:imagePath1] name:@"file" fileName:@"image1.png" mimeType:@"image/png" error:nil];
        [formData appendPartWithFileURL:[NSURL fileURLWithPath:imagePath2] name:@"file" fileName:@"image2.png" mimeType:@"image/png" error:nil];
    } error:nil];

    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

    NSURLSessionUploadTask *uploadTask;
    uploadTask = [manager uploadTaskWithStreamedRequest:request
                                               progress:^(NSProgress * _Nonnull uploadProgress) {
        NSLog(@"progress: %f", uploadProgress.fractionCompleted);
    }completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
        if (error) {
            NSLog(@"Error: %@", error);
        } else {
            NSLog(@"response: %@", responseObject);
            NSLog(@"responseObject: %@", responseObject);
        }
    }];

    [uploadTask resume];
}

1.4 Download Task

- (void)downloadTask {
    
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

    NSURL *URL = [NSURL URLWithString:@"http://httpbin.org/image/jpeg"];
    NSURLRequest *request = [NSURLRequest requestWithURL:URL];
    
    NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
        NSLog(@"progress: %@", downloadProgress);
    } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
        // 下载文件保存路径
        NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
        return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];
    } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
        NSLog(@"File downloaded to: %@", filePath);
    }];
    
    [downloadTask resume];
}

1.5 Request Serialization

NSString *URLString = @"http://example.com";
NSDictionary *parameters = @{@"foo": @"bar", @"baz": @[@1, @2, @3]};

1. AFHTTPRequestSerializer GET
[[AFHTTPRequestSerializer serializer] requestWithMethod:@"GET" URLString:URLString parameters:parameters error:nil];
/*
GET http://example.com?foo=bar&baz[]=1&baz[]=2&baz[]=3
 */

2. AFHTTPRequestSerializer POST
[[AFHTTPRequestSerializer serializer] requestWithMethod:@"POST" URLString:URLString parameters:parameters error:nil];
/*
POST http://example.com/
Content-Type: application/x-www-form-urlencoded

foo=bar&baz[]=1&baz[]=2&baz[]=3
 */

3. AFJSONRequestSerializer
[[AFJSONRequestSerializer serializer] requestWithMethod:@"POST" URLString:URLString parameters:parameters error:nil];
/*
POST http://example.com/
Content-Type: application/json

{"foo": "bar", "baz": [1,2,3]}
 */

2. Alamofire

2.1 简单请求

GET

    AF.request("https://httpbin.org/get").responseData { (response) in
        debugPrint(response)
    }

POST

    let parameters = ["name": "kang"]
    AF.request("https://httpbin.org/post", method: .post, parameters: parameters, encoder: URLEncodedFormParameterEncoder.default).validate(statusCode: 200..<300).validate(contentType: ["application/json"]).responseJSON { (response) in
        debugPrint(response)
    }

2.2 下载

    func download() {
        
        // 目的地址
        let destination: DownloadRequest.Destination = { _, _ in
            let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
            let fileURL = documentsURL.appendingPathComponent("image.png")

            return (fileURL, [.removePreviousFile, .createIntermediateDirectories])
        }

        // 下载
        AF.download("https://httpbin.org/image/png", to: destination)
            .downloadProgress { progress in
                    print("Download Progress: \(progress.fractionCompleted)")
                }
            .response { response in
            debugPrint(response)
            if response.error == nil, let imagePath = response.fileURL?.path {
                let image = UIImage(contentsOfFile: imagePath)
            }
        }

    }

2.3 上传

    func upload() {
        
        struct HTTPBinResponse: Decodable { let url: String }
        
        // Uploading Data
        let data = Data("data123".utf8)
        AF.upload(data, to: "https://httpbin.org/post").responseDecodable(of: HTTPBinResponse.self) { response in
            debugPrint(response)
        }
        
        // Uploading a File
        guard let fileURL = Bundle.main.url(forResource: "image", withExtension: "png") else { return }
        AF.upload(fileURL, to: "https://httpbin.org/post").responseDecodable(of: HTTPBinResponse.self) { response in
            debugPrint(response)
        }
        
        // Uploading Multipart Form Data
        AF.upload(multipartFormData: { multipartFormData in
            multipartFormData.append(Data("one".utf8), withName: "one")
            multipartFormData.append(Data("two".utf8), withName: "two")
        }, to: "https://httpbin.org/post")
            .uploadProgress { progress in
                print("Upload Progress: \(progress.fractionCompleted)")
            }
            .responseDecodable(of: HTTPBinResponse.self) { response in
                debugPrint(response)
            }

    }