AFNetworking的封装(三)--OC黑魔法

• 采用AFN自带的私有方法,对GET和POST进行封装!
• 在AFN的AFHTTPSessionManager.m里有dataTaskWithHTTPMethod私有方法! 发出的GET和POST请求,都要经过它! 所以,直接调用此方法就可以实现对请求的封装!
• dataTaskWithHTTPMethod是个私有方法,XCode不允许调用!那么,可以通过,先自定义协议,协议里面对dataTaskWithHTTPMethod方法进行声明,但并没有实现此方法 ,那么,XCode会去调用父类的dataTaskWithHTTPMethod方法!(也就是AFN的dataTaskWithHTTPMethod方法)这样就绕过了XCode,实现了AFN私有的方法!

注意: 封装的请求方法,requestProxy 后面要调用resume,因为是调用AFN的dataTaskWithHTTPMethod方法,此方法,后面有resume方法

#import "NetworkTools.h"

@protocol NetwookToolsProxy <NSObject>

 /// 网络请求方法
 ///
 /// @param method     HTTP 请求方法
 /// @param URLString  URLString
 /// @param parameters 参数字典
 /// @param uploadProgress   上传进度
 /// @param downloadProgress 下载进度
 /// @param success    成功回调
 /// @param failure    失败回调
 ///
 /// @return NSURLSessionDataTask
 /// 调用的是AFHTTPSessionManager.m --> dataTaskWithHTTPMethod 方法
@optional
- (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;
@end

/// 遵守网络协议 - 为了能够欺骗 Xcode 给一个智能提示，以及编译通过！
@interface NetworkTools () <NetwookToolsProxy>

@end

@implementation NetworkTools

/// NetworkTools 的单例方法
+(instancetype)sharedTools{
    static NetworkTools *tools;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        // 注意：末尾需要包含 '/'
        NSURL *baseURL = [NSURL URLWithString:@"http://www.weather.com.cn/"];
        tools = [[NetworkTools alloc]initWithBaseURL:baseURL];
        // 设置反序列化格式
        tools.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", @"text/html", nil];
    });
    return  tools;
}
///通过AFN已经封装好的方法,来实现GET和POST方法
/// 注意:resume
-(void)requestProxy:(RequestMethod)method URLString:(NSString *)URLString parameters:(id)parameters finished:(void(^)(id result, NSError *error))finished {
    NSString *methodName = (method == GET) ? @"GET": @"POST";
    
    [[self dataTaskWithHTTPMethod:methodName URLString:URLString parameters:parameters uploadProgress:nil downloadProgress:nil success:^(NSURLSessionDataTask *task, id responseObject) {
        
        finished(responseObject,nil);
    } failure:^(NSURLSessionDataTask *task, NSError *error) {
        
        finished(nil,error);
    }]resume];
}

//调用
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{   
    [self afnRequestProxy];
}
/// 已经封装的AFN请求(使用AFN自带的私有方法,通过协议,绕过Xcode,来实现POST和GET请求)
-(void)afnRequestProxy{
    NetworkTools *tools = [NetworkTools sharedTools];
    /*
     GET URLString:@"data/sk/101010100.html" parameters:nil
     
     POST URLString::@"http://httpbin.org/post" parameters:@{@"name": @"zhangsan", @"age": @18}  
     */
    [tools requestProxy:POST URLString:@"http://httpbin.org/get" parameters:@{@"name": @"zhangsan", @"age": @18} finished:^(id result, NSError *error) {
        if(result != nil){
            NSLog(@"调用成功了 %@",result);
        }else if(error != nil){
            NSLog(@"调用失败了:%@",error);
        }
    }];
}