BLOCK obj-c async call to JSON REST API GCD BLOCK

gistfile1.txt

dispatch_queue_t myQueue = dispatch_queue_create("My Queue",NULL);
dispatch_async(myQueue, ^{
    // Perform long running process

	NSArray *new = [self parseJsonResponse:@"https://pixabay.com/api/?username=soltrinox0&key=e4a2af6f6d7e4869afa1&q=fashion+woman&image_type=photo&orientation=vertical&min_width=350&per_page=50"];

	NSLog(@"%@", new  );
	NSMutableArray* offers = [NSMutableArray array];
	
	for (int i = 0; i < [new count]; i++) {
		NSDictionary *ip = [new objectAtIndex:i];
			Offer *ot = [[Offer alloc] initWithDict:ip];
		[offers addObject:ot];
	}
    
    dispatch_async(dispatch_get_main_queue(), ^{
        // Update the UI
		[[SimpplSingleton sharedManager] setNewArray:offers];
		DraggableViewBackground *draggableBackground = [[DraggableViewBackground alloc]initWithFrame:self.view.frame ];
		[self.view addSubview:draggableBackground];
    });
});


- (NSArray *)parseJsonResponse:(NSString *)urlString
{
    NSError *error;
    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"GET"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    
    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse: nil error:&error];
    if (!data)
    {
        NSLog(@"Download Error: %@", error.localizedDescription);
        UIAlertView *alert =
        [[UIAlertView alloc]initWithTitle:@"Error"
                                  message:[NSString stringWithFormat:@"Error : %@",error.localizedDescription]
                                 delegate:self
                        cancelButtonTitle:@"Ok"
                        otherButtonTitles:nil];
        [alert show];
        return nil;
    }
    
    // Parsing the JSON data received from web service into an NSDictionary object
    NSDictionary *JSON =
    [NSJSONSerialization JSONObjectWithData: data
                                    options: NSJSONReadingMutableContainers
                                      error: &error];
	NSArray *ret = [NSArray arrayWithArray:[JSON objectForKey:@"hits"]];
	 NSLog(@"Response JSON=%@", ret );

    return ret;
}