Network.h

#import "NetworkParams.h"

@interface Network : NSObject <NSURLConnectionDelegate, NSURLConnectionDataDelegate>

- (void) initWithRequest:(NSURLRequest*)request onCompletion:(CompletionBlock)success onError:(ErrorBlock)error;

@end

Network.m

#import "Network.h"

@interface Network ()

@property (strong, nonatomic) NSMutableArray *networkParams;

@end

@implementation Network

- (void) initWithRequest:(NSURLRequest*)request onCompletion:(CompletionBlock)success onError:(ErrorBlock)error{
    
    NetworkParams *param = [[NetworkParams alloc] init];
    
    param.request = request;
    param.completionBlock = success;
    param.errorBlock = error;
    
    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    param.connection = connection;
    [_networkParams addObject:param];
    [connection start];
    

}

#pragma marks - NSURLConnectionDelegate 

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
    
    HDNetworkParams *param = [[_networkParams filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"connection = %@", connection]] lastObject];
    
    if (param) {
        if (param.errorBlock) {
            param.errorBlock(error);
        }
    }
}

- (BOOL)connectionShouldUseCredentialStorage:(NSURLConnection *)connection{
    return NO;
}

- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge{
}

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge{
}

- (void)connection:(NSURLConnection *)connection didCancelAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge{
}

#pragma marks - NSURLConnectionDataDelegate

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    
    
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
    
    HDNetworkParams *param = [[_networkParams filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"connection = %@", connection]] lastObject];
    
    if (param) {
        param.responseData = data;
    }
    
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection{
    
    NetworkParams *param = [[_networkParams filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"connection = %@", connection]] lastObject];
    
    if (param) {
        if (param.completionBlock) {
            param.completionBlock(param.responseData);
        }
    }
    
}

@end

NetworkParams.h

#import <Foundation/Foundation.h>

typedef void (^CompletionBlock)(id responseData);
typedef void (^ErrorBlock)(NSError* error);

@interface NetworkParams : NSObject

@property (nonatomic, strong) NSURLConnection    *connection;
@property (nonatomic, strong) NSURLRequest       *request;
@property (nonatomic, strong) CompletionBlock    completionBlock;
@property (nonatomic, strong) ErrorBlock         errorBlock;
@property (nonatomic, assign) id                 responseData;

@end

NetworkParams.m

#import "NetworkParams.h"

@implementation NetworkParams

@end