JSONExample.m

//Class declaration

@interface ClassName () <NSURLSessionDelegate> // Implement Delegate







//Init Method to configure session for datatask
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if (self)
    {
        // Create Session with the default configuration
        NSURLSessionConfiguration *config =
        [NSURLSessionConfiguration defaultSessionConfiguration];
        _session = [NSURLSession sessionWithConfiguration:config
                                                 delegate:self
                                            delegateQueue:nil];
    }
    return self;
}






// Grab the JSON data and assign it to the beers array
- (void)fetchJSONData
{
    // Create request
    NSString *requestString = @"https://prost.herokuapp.com/api/v1/beer/rand"; // This is your API location
    NSURL *url = [NSURL URLWithString:requestString];
    NSURLRequest *req = [NSURLRequest requestWithURL:url];
    
    // make a data task with completion handler that assigns the result to the beers property
    NSURLSessionTask *dataTask =
    [self.session dataTaskWithRequest:req
                    completionHandler:
     ^(NSData *data, NSURLResponse *response, NSError *error)
     {
         if (data == nil)
         {
             return;
         }
         NSDictionary *jsonObject = [NSJSONSerialization JSONObjectWithData:data
                                                                    options:0
                                                                      error:nil];
         // the jsonObject is not an NSDictionary with the stored JSON data
        
     }];
    // DataTasks are created in a paused state and must be resumed to start
    [dataTask resume];
}