OBJC:Calling Web service using NSURLRequest & Blocks

OBJC:Calling Web service using NSURLRequest & Blocks

- (IBAction)fetchGreeting;
{
    NSURL *url = [NSURL URLWithString:@"http://rest-service.guides.spring.io/greeting"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [NSURLConnection sendAsynchronousRequest:request
                                       queue:[NSOperationQueue mainQueue]
                           completionHandler:^(NSURLResponse *response,
                                               NSData *data, NSError *connectionError)
     {
         if (data.length > 0 && connectionError == nil)
         {
             NSDictionary *greeting = [NSJSONSerialization JSONObjectWithData:data
                                                                      options:0
                                                                        error:NULL];
             self.greetingId.text = [[greeting objectForKey:@"id"] stringValue];
             self.greetingContent.text = [greeting objectForKey:@"content"];
         }
     }];
}

// More: https://spring.io/guides/gs/consuming-rest-ios/.
// But using sendAsynchronousRequest:queue:completionHandler has been deprecated from iOS9. Use [NSURLSession dataTaskWithRequest:completionHandler:]