AFNetworking 3.x 调用

AFNetworking 3.x是基于NSURLSession再次封装的

大致结构如下：

NSURLSession

• AFURLSessionManager
• AFHTTPSessionManager

Serialization

• <AFURLRequestSerialization>
  • AFHTTPRequestSerializer
  • AFJSONRequestSerializer
  • AFPropertyListRequestSerializer
• <AFURLResponseSerialization>
  • AFHTTPResponseSerializer
  • AFJSONResponseSerializer
  • AFXMLParserResponseSerializer
  • AFXMLDocumentResponseSerializer (Mac OS X)
  • AFPropertyListResponseSerializer
  • AFImageResponseSerializer
  • AFCompoundResponseSerializer

Additional Functionality

• AFSecurityPolicy
• AFNetworkReachabilityManager

使用方法也可以根据具体情景使用对应的类方法

AFURLSessionManager

AFURLSessionManager是创建并管理了一个基于特定的NSURLSessionConfiguration并且遵从<NSURLSessionTaskDelegate>, <NSURLSessionDataDelegate>, <NSURLSessionDownloadDelegate>, 和 <NSURLSessionDelegate>协议的NSURLSession对象，这使得他能够实现http请求和文件上传下载等功能。

创建一个下载任务：

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

NSURL *URL = [NSURL URLWithString:@"http://example.com/download.zip"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];

NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
    NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
    return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
    NSLog(@"File downloaded to: %@", filePath);
}];
[downloadTask resume];

创建一个上传任务：

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

NSURL *URL = [NSURL URLWithString:@"http://example.com/upload"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];

NSURL *filePath = [NSURL fileURLWithPath:@"file://path/to/image.png"];
NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithRequest:request fromFile:filePath progress:nil completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
    if (error) {
        NSLog(@"Error: %@", error);
    } else {
        NSLog(@"Success: %@ %@", response, responseObject);
    }
}];
[uploadTask resume];

创建一个带有进度的 Multi-Part Request 的上传任务

NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:@"http://example.com/upload" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        [formData appendPartWithFileURL:[NSURL fileURLWithPath:@"file://path/to/image.jpg"] name:@"file" fileName:@"filename.jpg" mimeType:@"image/jpeg" error:nil];
    } error:nil];

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

NSURLSessionUploadTask *uploadTask;
uploadTask = [manager
              uploadTaskWithStreamedRequest:request
              progress:^(NSProgress * _Nonnull uploadProgress) {
                  // This is not called back on the main queue.
                  // You are responsible for dispatching to the main queue for UI updates
                  dispatch_async(dispatch_get_main_queue(), ^{
                      //Update the progress view
                      [progressView setProgress:uploadProgress.fractionCompleted];
                  });
              }
              completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
                  if (error) {
                      NSLog(@"Error: %@", error);
                  } else {
                      NSLog(@"%@ %@", response, responseObject);
                  }
              }];

[uploadTask resume];

创建一个Data任务

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 completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
    if (error) {
        NSLog(@"Error: %@", error);
    } else {
        NSLog(@"%@ %@", response, responseObject);
    }
}];
[dataTask resume];

---

Request Serialization

Request serializers根据URL字符串创建请求，编码参数作为查询字符串或HTTP体。

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

查询字符串参数编码

[[AFHTTPRequestSerializer serializer] requestWithMethod:@"GET" URLString:URLString parameters:parameters error:nil];

GET http://example.com?foo=bar&baz[]=1&baz[]=2&baz[]=3

URL形式参数编码

[[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

JSON参数编码

[[AFJSONRequestSerializer serializer] requestWithMethod:@"POST" URLString:URLString parameters:parameters error:nil];

POST http://example.com/
Content-Type: application/json

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

---

Network Reachability Manager

AFNetworkReachabilityManager 监控域名以及对于WWAN 和 WiFi网络接口的地址的可达性

可参考 WWDC 2012 session 706, "Networking Best Practices.".

Shared Network Reachability

[[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
    NSLog(@"Reachability: %@", AFStringFromNetworkReachabilityStatus(status));
}];

[[AFNetworkReachabilityManager sharedManager] startMonitoring];

---

Security Policy

AFSecurityPolicy 用于评估与寄托的X.509证书的公共密钥和安全连接是否服务器信任。

在应用程序中添加固定的SSL证书有助于防止中间人攻击和其他漏洞。强烈地处理敏感客户数据或财务信息的应用程序可以通过HTTPS连接配置和启用SSL连接路由所有通信。

Allowing Invalid SSL Certificates

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.securityPolicy.allowInvalidCertificates = YES; // not recommended for production

AFHTTPSessionManager是AFURLSessionManager的子类。

参数说明：

baseURL

用于从方法中的相对路径构造请求的URL