一.思路

整個項目的所有api請求看成一個tableView，那么每一個api請求就相當(dāng)于一個cell。每一次api請求，就是把parameters和url賦值給cell，然后調(diào)用afn的api裕循。

在調(diào)用afn的api之前，先監(jiān)聽一下當(dāng)前網(wǎng)絡(luò)狀態(tài)净刮，做相應(yīng)的邏輯處理剥哑。
退出某個頁面之前，api請求還沒有結(jié)果返回淹父，取消該請求株婴。

二.第一層封裝（簡單的調(diào)用afn）

- (NSURLSessionDataTask *)requestWithConfigure:(HttpRequestConfigure *)configure
                                       Success:(ResponseSuccess)success
                                       Failure:(ResponseFailed)failure
                                      Finished:(ResponseFinished)finished{
    AFHTTPSessionManager *sessionManger = [AFHTTPSessionManager sharedManager];
    // -- 網(wǎng)絡(luò)超時時間設(shè)置 --
    [sessionManger.requestSerializer willChangeValueForKey:@"timeoutInterval"];
    sessionManger.requestSerializer.timeoutInterval = configure.timeoutInterval;
    [sessionManger.requestSerializer didChangeValueForKey:@"timeoutInterval"];
    
    switch (configure.requestType) {
        case RequestTypeGET:{
            return [sessionManger GET:configure.requestUrl
                           parameters:configure.parameters
                             progress:nil
                              success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
                                  success(task,responseObject);
                                  finished(task,responseObject,nil);
                              }
                              failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
                        failure(task,error);
                        finished(task,nil,error);
                   }];
            break;
        }
        case RequestTypePOST:{
            return [sessionManger POST:configure.requestUrl
                            parameters:configure.parameters
                              progress:nil
                               success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
                                   success(task,responseObject);
                                   finished(task,responseObject,nil);
                               }
                               failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
                       failure(task,error);
                       finished(task,nil,error);
                   }];
            break;
        }
        // --如果還需要其他類型的請求，可以在這里繼續(xù)添加--
    }
}

如果afn更新暑认，相應(yīng)api變動困介，只需要在這里修改。

三.第二層封裝

- (NSURLSessionDataTask *)sendRequest:(ResponseConfigure)configureBlock
                              Success:(SuccessCallBackData)success
                              Failure:(FailedCallBackReason)failure
                             Finished:(FinishedCallBack)finished{
    HttpRequestConfigure *configure = [HttpRequestConfigure setConfigure];
    if (configureBlock) {
        configureBlock(configure);
    }
    HttpRequestConfigure *requestConfigure = [self resetRequestConfiguration:configure];
    if ([[HttpNetwork sharedNetwork] isReachable]) {
        return [[HttpRequestBasics defaultCenter] requestWithConfigure:requestConfigure Success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            NSDictionary *data = [self analyzeResponseData:responseObject];
            if (success) {
                success(data);
            }
        } Failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            NSString *reason = [self returnErrorDescription:error];
            if (failure) {
                failure(reason);
            }
        } Finished:^(NSURLSessionDataTask * _Nullable task, id  _Nullable responseObject, NSError * _Nullable error) {
            NSDictionary *data = [self analyzeResponseData:responseObject];
            NSString *reason = [self returnErrorDescription:error];
            if (finished) {
                finished(data, reason);
            }
        }];
    }
    else{
        failure(kNotHttpNetExpression);
        return nil;
    }
}

將外部傳進(jìn)來的parameters和url賦值給請求配置cell （即HttpRequestConfigure對象）蘸际，把cell傳遞到第一層座哩。
在調(diào)用第一層方法之前，判斷網(wǎng)絡(luò)可用性（使用Reachability）：
[[HttpNetwork sharedNetwork] isReachable]

四. 外部調(diào)用

    // 沒有回調(diào)
    [HttpRequestTool sendRequest:^(HttpRequestConfigure *configure) {
        configure.requestType = RequestTypePOST;
        configure.specialUrl = kHomePage_Ad_URL;
    }];
    // 成功回調(diào)
    [HttpRequestTool sendRequest:^(HttpRequestConfigure *configure) {
        configure.requestType = RequestTypePOST;
        configure.specialUrl = kHomePage_Ad_URL;
    } Success:^(NSDictionary *dict) {
        NSLog(@"dict:%@",dict);
    }];
    // 失敗回調(diào)
    [HttpRequestTool sendRequest:^(HttpRequestConfigure *configure) {
        configure.requestType = RequestTypePOST;
        configure.specialUrl = kHomePage_Ad_URL;
    } Failure:^(NSString *reason) {
        NSLog(@"reason:%@",reason);
    }];
    // 結(jié)束回調(diào)
    [HttpRequestTool sendRequest:^(HttpRequestConfigure *configure) {
        configure.requestType = RequestTypePOST;
        configure.specialUrl = kHomePage_Ad_URL;
    } Finished:^(NSDictionary * _Nullable dict, NSString *reason) {
        NSLog(@"--");
    }];
    // 成功和失敗回調(diào)
    [HttpRequestTool sendRequest:^(HttpRequestConfigure *configure) {
        configure.requestType = RequestTypePOST;
        configure.specialUrl = kHomePage_Ad_URL;
    } Success:^(NSDictionary *dict) {
        NSLog(@"dict:%@",dict);
    } Failure:^(NSString *reason) {
        NSLog(@"reason:%@",reason);
    }];
    // 成功粮彤，失敗和結(jié)束回調(diào)
    NSURLSessionDataTask *task = [HttpRequestTool sendRequest:^(HttpRequestConfigure *configure) {
        configure.requestType = RequestTypePOST;
        configure.specialUrl = kHomePage_Ad_URL;
    } Success:^(NSDictionary *dict) {
        NSLog(@"dict:%@",dict);
    } Failure:^(NSString *reason) {
        NSLog(@"reason:%@",reason);
    } Finished:^(NSDictionary * _Nullable dict, NSString *reason) {
        NSLog(@"--");
    }];
    // 在需要取消請求的地方取消請求
    [task cancel];

[task cancel];取消該線程根穷，一般會在控制器銷毀（dealloc）的時候調(diào)用。

五. Demo

HttpRequestTool

六.討論

該請求工具我親試导坟，沒有發(fā)現(xiàn)什么問題屿良，而且也非常方便。如果遇到問題或者有什么建議惫周，歡迎評論探討管引。

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