iOS 用AF请求webService

因为工作上的需要，前后台的接口对接使用的webService进行的。本人之前的对接经验主要是webApi对接，返回JSON串进行处理。使用webService对接真心没有经验，更让我尴尬的是我之前就没听过webService这个名词😅。因为工作的需要以及弥补自己的不足，研究一下AF使用webService的请求。本人写的不好，大家多多见谅，希望能为同样经历的人提供一点帮助。

首先对AF进行初始化，我写的二次封装是继承于AFHTTPSessionManager写的。self与manager在调用方法上是一样的。

//初始化
AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] init];

//设置请求类型
manager.responseSerializer = [AFXMLParserResponseSerializer serializer];
//设置请求超时时间
manager.requestSerializer.timeoutInterval = 30;
//设置这个的目的是返回信息成功后，信息为NSData类型，否则为NSXMLParser类型
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
//这个一定要设置，否则会请求失败
[manager.requestSerializer setValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
//我参考了其他人的经验，但是以我的情况来说，使用“application/soap+xml”无法请求成功
//  [manager.requestSerializer setValue:@"application/soap+xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];

manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", @"text/html", @"image/jpeg", @"text/plain", @"text/xml", nil];

这样webService的设置基本完成了，接下来需要按照各自的接口协议对参数进行设置，外部接口仍然按照NSDictionary的形式传进来，在二次封装内部进行处理
****特别注意：BaseUrl并非是完整的请求地址，只是域名部分末尾有“/”

//url：请求地址  dictionary：请求参数  action：方法名   successObject：成功回调   failureObject：失败回调  errorObject：异常回调
- (void)post_Url:(NSString *)url Param:(NSDictionary *)dictionary Action:(NSString *)action Success:(SuccessCompletedBlock)successObject Failure:(FailureCompletedBlock)failureObject Error:(ErrorCompletedBlock)errorObject {
    NSMutableString *soapMutableStr = [self parameterToDealAction:action param:dictionary];
    //请求发送到的路径
    [self.requestSerializer setValue:[NSString stringWithFormat:@"%zd", soapMutableStr.length] forHTTPHeaderField:@"Content-Length"];
    //设置HTTPBody
    [self.requestSerializer setQueryStringSerializationWithBlock:^NSString *(NSURLRequest *request, NSDictionary *parameters, NSError *__autoreleasing *error) {
        return soapMutableStr;
    }];

    //数据请求
    [self POST:url parameters:soapMutableStr progress:^(NSProgress * _Nonnull downloadProgress) {
       } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        //responseObject 一个NSData类型的文件
        //数据的返回的具体格式是JSON类型（与后台协商后），需要封装个方法提取并转化为NSDictionary类型
        NSDictionary *dict = [NSDictionary dictionaryWithDictionary:[CYTextTool webServiceDataExchangeDictionary:responseObject action:action]];
        if (dict && [[dict objectForKey:@"status"] integerValue] == 0) {
            //成功回调
            if (successObject) {
                successObject(dict);
            }
        }else {
            //失败回调
            if (failureObject) {
                failureObject(dict);
            }
        }
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
         //异常回调
        if (error) {
            errorObject(error);
        }
    }];
}

下面是对整体参数的封装处理

- (NSMutableString *)parameterToDealAction:(NSString *)action param:(NSDictionary *)dictionary {
    //Header为请求头 MineSoapHeader为方法名  key为参数(宏，是前后台内部定义的)   BaseUrl为域名地址(宏)
    NSString *headStr = [NSString stringWithFormat:
                         @"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
                         "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"
                         "<soap:Header>\n"
                         "<MineSoapHeader xmlns=\"%@\">\n"
                         "<key>%@</key>\n"
                         "</MineSoapHeader>\n"
                         "</soap:Header>\n" , BaseUrl, APP_KEY
                         ];
    //参数拼接
    NSMutableString *soapMutableStr = [NSMutableString stringWithString:headStr];
    //判断是否存在方法名
    if (action.length > 0) {
        //将body拼接上
        [soapMutableStr appendString:[NSString stringWithFormat:@"<soap:Body>\n"
                                      "<%@ xmlns=\"%@\">\n", action, BaseUrl]];
    }
    //判断是否存在参数（如果存在参数一定会有方法名的）
    if (dictionary) {
        //将参数拼接进字符串中，格式<key>value</key>
        for (NSString *key in dictionary) {
            [soapMutableStr appendString:[NSString stringWithFormat:@"<%@>%@</%@>\n", key, [dictionary objectForKey:key], key]];
        }
    }
    //拼接body结束符
    if (action.length > 0) {
        [soapMutableStr appendString:[NSString stringWithFormat:@"</%@>\n""</soap:Body>\n", action]];
    }
    //拼接整体请求结束符
    [soapMutableStr appendString:@"</soap:Envelope>\n"];
    return  soapMutableStr;
}

请求成功后对返回的数据进行处理，CYTextTool是自定义的工具类

//将NSData转化成NSDictionary
//data为返回文件  action为方法名
+ (NSDictionary *)webServiceDataExchangeDictionary:(NSData *)data action:(NSString *)action {
    NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    // 利用正则表达式取出<action></action>之间的字符串
    NSRegularExpression *regular = [[NSRegularExpression alloc] initWithPattern:[NSString stringWithFormat:@"(?<=%@Result\\>).*(?=</%@Result)", action, action] options:NSRegularExpressionCaseInsensitive error:nil];
    //创建接收字典
    NSDictionary *dic = [NSDictionary dictionary];
    for (NSTextCheckingResult *checkingResult in [regular matchesInString:result options:0 range:NSMakeRange(0, result.length)]) {
        // 得到字典
        dic = [NSJSONSerialization JSONObjectWithData:[[result substringWithRange:checkingResult.range] dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableLeaves error:nil];
    }
    return dic;
}