AFNetworking 3.0 源码解读(六)之 AFHTTPSessionManager

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AFHTTPSessionManager相对来说比较好理解,代码也比较短。但却是我们平时可能使用最多的类。

AFNetworking 3.0 源码解读(一)之 AFNetworkReachabilityManager

AFNetworking 3.0 源码解读(二)之 AFSecurityPolicy

AFNetworking 3.0 源码解读(三)之 AFURLRequestSerialization

AFNetworking 3.0 源码解读(四)之 AFURLResponseSerialization

AFNetworking 3.0 源码解读(五)之 AFURLSessionManager

前言

AFHTTPSessionManagerAFURLSessionManager的子类,是专门为HTTP请求设计的。里边涉及到了GET,POST,PUT,DELETE 等等HTTPMehtod。因此我们要想正确的使用各种方法,就要理解每个method的含义。
可以通过这篇文章来了解HTTP Method详细解读(GET HEAD POST OPTIONS PUT DELETE TRACE CONNECT)

1.相对路径(relative)

假如有一个基础路径NSURL *baseURL = [NSURL URLWithString:@"http://example.com/v1/"];我们暂时命名为baseURL.所谓 相对 肯定跟这个baseURL有关系。

我们可以通过NSURL +URLWithString:relativeToURL:这个方法来获取一个路径,至于怎么使用,我们通过一个例子来说明:

NSURL *baseURL = [NSURL URLWithString:@"http://example.com/v1/"];[NSURL URLWithString:@"foo" relativeToURL:baseURL];                  // http://example.com/v1/foo[NSURL URLWithString:@"foo?bar=baz" relativeToURL:baseURL];          // http://example.com/v1/foo?bar=baz[NSURL URLWithString:@"/foo" relativeToURL:baseURL];                 // http://example.com/foo[NSURL URLWithString:@"foo/" relativeToURL:baseURL];                 // http://example.com/v1/foo[NSURL URLWithString:@"/foo/" relativeToURL:baseURL];                // http://example.com/foo/[NSURL URLWithString:@"http://example2.com/" relativeToURL:baseURL]; // http://example2.com/

至于 绝对路径 和 相对路径 的定义,使用方法,优缺点,这里就不提了,大家可以自行了解。说一下为什么使用相对路径吧。

在真实开发中,一般都会有一个线上的服务器和一下测试服务器,当然也可能多个。在ios开发中切换开发环境有好几种方法,

  1. 通过target
  2. 自定义一个字段HTTPURL,用它来控制路径
  3. 通过相对路径来切换接口

2.GET

// 使用GET 方法获取数据,不带进度- (NSURLSessionDataTask *)GET:(NSString *)URLString                   parameters:(id)parameters                      success:(void (^)(NSURLSessionDataTask *task, id responseObject))success                      failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure{    return [self GET:URLString parameters:parameters progress:nil success:success failure:failure];}// 使用GET 方法获取数据,带进度- (NSURLSessionDataTask *)GET:(NSString *)URLString                   parameters:(id)parameters                     progress:(void (^)(NSProgress * _Nonnull))downloadProgress                      success:(void (^)(NSURLSessionDataTask * _Nonnull, id _Nullable))success                      failure:(void (^)(NSURLSessionDataTask * _Nullable, NSError * _Nonnull))failure{    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"GET"                                                        URLString:URLString                                                       parameters:parameters                                                   uploadProgress:nil                                                 downloadProgress:downloadProgress                                                          success:success                                                          failure:failure];    [dataTask resume];    return dataTask;}

// 使用HEAD 方法获取数据,- (NSURLSessionDataTask *)HEAD:(NSString *)URLString                    parameters:(id)parameters                       success:(void (^)(NSURLSessionDataTask *task))success                       failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure{    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"HEAD" URLString:URLString parameters:parameters uploadProgress:nil downloadProgress:nil success:^(NSURLSessionDataTask *task, __unused id responseObject) {        if (success) {            success(task);        }    } failure:failure];    [dataTask resume];    return dataTask;}

4.POST

- (NSURLSessionDataTask *)POST:(NSString *)URLString                    parameters:(id)parameters                       success:(void (^)(NSURLSessionDataTask *task, id responseObject))success                       failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure{    return [self POST:URLString parameters:parameters progress:nil success:success failure:failure];}- (NSURLSessionDataTask *)POST:(NSString *)URLString                    parameters:(id)parameters                      progress:(void (^)(NSProgress * _Nonnull))uploadProgress                       success:(void (^)(NSURLSessionDataTask * _Nonnull, id _Nullable))success                       failure:(void (^)(NSURLSessionDataTask * _Nullable, NSError * _Nonnull))failure{    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"POST" URLString:URLString parameters:parameters uploadProgress:uploadProgress downloadProgress:nil success:success failure:failure];    [dataTask resume];    return dataTask;}

5.上传数据

- (NSURLSessionDataTask *)POST:(NSString *)URLString                    parameters:(nullable id)parameters     constructingBodyWithBlock:(nullable void (^)(id<AFMultipartFormData> _Nonnull))block                       success:(nullable void (^)(NSURLSessionDataTask * _Nonnull, id _Nullable))success                       failure:(nullable void (^)(NSURLSessionDataTask * _Nullable, NSError * _Nonnull))failure{    return [self POST:URLString parameters:parameters constructingBodyWithBlock:block progress:nil success:success failure:failure];}- (NSURLSessionDataTask *)POST:(NSString *)URLString                    parameters:(id)parameters     constructingBodyWithBlock:(void (^)(id <AFMultipartFormData> formData))block                      progress:(nullable void (^)(NSProgress * _Nonnull))uploadProgress                       success:(void (^)(NSURLSessionDataTask *task, id responseObject))success                       failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure{    NSError *serializationError = nil;    NSMutableURLRequest *request = [self.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:[[NSURL URLWithString:URLString relativeToURL:self.baseURL] absoluteString] parameters:parameters constructingBodyWithBlock:block error:&serializationError];    if (serializationError) {        if (failure) {#pragma clang diagnostic push#pragma clang diagnostic ignored "-Wgnu"            dispatch_async(self.completionQueue ?: dispatch_get_main_queue(), ^{                failure(nil, serializationError);            });#pragma clang diagnostic pop        }        return nil;    }    __block NSURLSessionDataTask *task = [self uploadTaskWithStreamedRequest:request progress:uploadProgress completionHandler:^(NSURLResponse * __unused response, id responseObject, NSError *error) {        if (error) {            if (failure) {                failure(task, error);            }        } else {            if (success) {                success(task, responseObject);            }        }    }];    [task resume];    return task;}

6.PUT

- (NSURLSessionDataTask *)PUT:(NSString *)URLString                   parameters:(id)parameters                      success:(void (^)(NSURLSessionDataTask *task, id responseObject))success                      failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure{    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"PUT" URLString:URLString parameters:parameters uploadProgress:nil downloadProgress:nil success:success failure:failure];    [dataTask resume];    return dataTask;}

7.PATCH

- (NSURLSessionDataTask *)PATCH:(NSString *)URLString                     parameters:(id)parameters                        success:(void (^)(NSURLSessionDataTask *task, id responseObject))success                        failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure{    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"PATCH" URLString:URLString parameters:parameters uploadProgress:nil downloadProgress:nil success:success failure:failure];    [dataTask resume];    return dataTask;}

8.DELETE

- (NSURLSessionDataTask *)DELETE:(NSString *)URLString                      parameters:(id)parameters                         success:(void (^)(NSURLSessionDataTask *task, id responseObject))success                         failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure{    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"DELETE" URLString:URLString parameters:parameters uploadProgress:nil downloadProgress:nil success:success failure:failure];    [dataTask resume];    return dataTask;}

9.私有方法

- (NSURLSessionDataTask *)dataTaskWithHTTPMethod:(NSString *)method                                       URLString:(NSString *)URLString                                      parameters:(id)parameters                                  uploadProgress:(nullable void (^)(NSProgress *uploadProgress)) uploadProgress                                downloadProgress:(nullable void (^)(NSProgress *downloadProgress)) downloadProgress                                         success:(void (^)(NSURLSessionDataTask *, id))success                                         failure:(void (^)(NSURLSessionDataTask *, NSError *))failure{    NSError *serializationError = nil;    NSMutableURLRequest *request = [self.requestSerializer requestWithMethod:method URLString:[[NSURL URLWithString:URLString relativeToURL:self.baseURL] absoluteString] parameters:parameters error:&serializationError];    if (serializationError) {        if (failure) {#pragma clang diagnostic push#pragma clang diagnostic ignored "-Wgnu"            dispatch_async(self.completionQueue ?: dispatch_get_main_queue(), ^{                failure(nil, serializationError);            });#pragma clang diagnostic pop        }        return nil;    }    __block NSURLSessionDataTask *dataTask = nil;    dataTask = [self dataTaskWithRequest:request                          uploadProgress:uploadProgress                        downloadProgress:downloadProgress                       completionHandler:^(NSURLResponse * __unused response, id responseObject, NSError *error) {        if (error) {            if (failure) {                failure(dataTask, error);            }        } else {            if (success) {                success(dataTask, responseObject);            }        }    }];    return dataTask;}

这篇文章确实比较简单,有了前几篇文章的铺垫,到了我们真正使用的时候,一切都变得那么简单自然啊.我们已经不知不觉中学到了很多知识,但有一点,知识这东西,要反复的记忆才能记住。举个例子吧 ,平时可能我们需要在web端查看json数据,当我们把参数拼接到paramter中,该怎么查看呢?

  1. 找到AFURLRequestSerialization这个.m
  2. 找到requestBySerializingRequest: withParameters: error:这个方法
  3. NSLog(@"URL: %@",mutableRequest.URL.absoluteString);

说明

接下来先把 AFNetworking 的分类再解析完,然后开始搭建网络框架。

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