AFNetworking--- 네트워크 요청 패키지

성명: 이 클래스는 AFNetworking에 대한 2차 패키지입니다.
1. NSObject에서 RequestManager 클래스 상속 만들기

>  
>//   NSData
typedef void(^Finish)(NSData *data);
> //   NSError
typedef void(^Error)(NSError *error);
>//  
typedef NS_ENUM(NSInteger, RequestType) {
    RequestGET,
    RequestPOST
};

속성 선언

@property (nonatomic, copy)Finish finish;
@property (nonatomic, copy)Error error;
>  ， ， 
+ (void)requestWithUrlString:(NSString *)urlString requestType:(RequestType)requestType parDic:(NSDictionary *)parDic finish:(Finish)finish error:(Error)error;

2.RequestManager.m

> 
+ (void)requestWithUrlString:(NSString *)urlString requestType:(RequestType)requestType parDic:(NSDictionary *)parDic finish:(Finish)finish error:(Error)error;
{
    RequestManager *request = [[RequestManager alloc] init];
    [request requestWithUrlString:urlString requestType:requestType parDic:parDic finish:finish error:error];
}
> 
- (void)requestWithUrlString:(NSString *)urlString requestType:(RequestType)requestType parDic:(NSDictionary *)parDic finish:(Finish)finish error:(Error)error;
{
    //  block 
    self.finish = finish;
    self.error = error;   
    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    request.timeoutInterval = 10;
    //  POST 
    if (requestType == RequestPOST)
    {
        [request setHTTPMethod:@"POST"];
        if (parDic.count > 0) {
            [request setHTTPBody:[self parDicToPOSTData:parDic]];
        }
    }
    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        if (error) {
            self.error(error);
        }
        else  {
            dispatch_async(dispatch_get_main_queue(), ^{
                self.finish(data);
            });
        }
    }];
    //   
    [task resume];    
}
// 
- (NSData *)parDicToPOSTData:(NSDictionary *)parDic
{
    NSMutableArray *array = [NSMutableArray array];
    for (NSString *key in parDic)
    {
        NSString *string = [NSString stringWithFormat:@"%@=%@", key, parDic[key]];
        [array addObject:string];
    }
    NSString *postString = [array componentsJoinedByString:@"&"];
    return [postString dataUsingEncoding:NSUTF8StringEncoding];
}