DOViewController.h

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#import "AFJSONRequestOperation.h"
#import <SSToolkit/SSToolkit.h>

@interface DOViewController : UIViewController<CLLocationManagerDelegate, UITableViewDelegate, UITableViewDataSource>{
    CLLocationManager* _locationManager;
}

@property (strong, nonatomic) IBOutlet UITableView *tableView;
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
@property (strong, nonatomic) AFJSONRequestOperation *foursquareJSONRequestOperation;
@property (strong, nonatomic) NSURLRequest *foursquareRequest;
@property (strong, nonatomic) SSHUDView *progressHUD;
@property (strong, nonatomic) NSArray *foursquareVenues;

- (IBAction)refreshButton:(UIBarButtonItem *)sender;

@end

DOViewController.m

#import "DOViewController.h"
#import "DOAnnotation.h"

@interface DOViewController ()

@end

@implementation DOViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
    self.title = @"Nearby";
    _tableView.tableHeaderView = _mapView;
    _locationManager = [[CLLocationManager alloc]init];
    _locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    _locationManager.delegate = self;
    [_locationManager startUpdatingLocation];
}

- (NSURL*)findLocalRestaurantsURL:(NSString*)currentLocation{
    NSString *baseURL = @"https://api.foursquare.com/v2/venues/explore?";
    NSString *queryParams = @"section=food&intent=browse&ll=";
    NSString *clientInfo = @"&client_id=XXXXX&client_secret=XXXX&v=20130323";
    NSString *url = [NSString stringWithFormat:@"%@%@%@%@", baseURL, queryParams, currentLocation, clientInfo];
//    NSLog(@"%@", [NSURL URLWithString:url]);
    return [NSURL URLWithString:url];
}

- (void)makeJSONRequestForLocation:(NSString*)location{
    _progressHUD = [[SSHUDView alloc] initWithTitle:@"loading" loading:YES];
    [_progressHUD show];
    NSURL *url = [self findLocalRestaurantsURL:location];
    _foursquareRequest = [NSURLRequest requestWithURL:url];
    _foursquareJSONRequestOperation = [AFJSONRequestOperation JSONRequestOperationWithRequest:_foursquareRequest success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON){
        NSDictionary *resp = [NSDictionary dictionaryWithDictionary:JSON[@"response"]];
        NSArray *groups = resp[@"groups"];
        _foursquareVenues = groups[0][@"items"];
        [self plotVenuesOnMap:_foursquareVenues];
        [_progressHUD dismissAnimated:YES];
    } failure:nil];
    [_foursquareJSONRequestOperation start];
}

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
    CLLocation *newLocation = [locations lastObject];
    [self setupMapforLocation:newLocation];
    [_locationManager stopUpdatingLocation];
    NSString *location = [NSString stringWithFormat:@"%f,%f", newLocation.coordinate.latitude, newLocation.coordinate.longitude];
    [self makeJSONRequestForLocation:location];
//    [self getVenuesForLocation:newLocation];
}

-(void)setupMapforLocation:(CLLocation*)newLocation{
    NSLog(@"SETUP MAP FOR LOCATION");
    MKCoordinateRegion region;
    MKCoordinateSpan span;
    span.latitudeDelta = 0.003;
    span.longitudeDelta = 0.003;
    CLLocationCoordinate2D location;
    location.latitude = newLocation.coordinate.latitude;
    location.longitude = newLocation.coordinate.longitude;
    region.span = span;
    region.center = location;
    [_mapView setRegion:region animated:YES];
}

- (void)plotVenuesOnMap:(NSArray*)venues{
    for (id<MKAnnotation> annotation in _mapView.annotations){
        [_mapView removeAnnotation:annotation];
    }
    
    for (NSDictionary *thisDict in venues){
        NSDictionary *thisVenue = thisDict[@"venue"];
        NSString *name = thisVenue[@"name"];
        NSNumber *latitude = thisVenue[@"location"][@"lat"];
        NSNumber *longitude = thisVenue[@"location"][@"lng"];
        NSString *address = thisVenue[@"location"][@"address"];
        
        CLLocationCoordinate2D coordinate;
        coordinate.latitude = latitude.doubleValue;
        coordinate.longitude = longitude.doubleValue;
        DOAnnotation *annotation = [[DOAnnotation alloc] initWithName:name address:address coordinate:coordinate];
        [_mapView addAnnotation:annotation];
    }
}
- (IBAction)refreshButton:(UIBarButtonItem *)sender {
    NSLog(@"TAPPED!");
    CLLocation *currentLocation = _locationManager.location;
    [self setupMapforLocation:currentLocation];
    [_locationManager stopUpdatingLocation];
    NSString *location = [NSString stringWithFormat:@"%f,%f", currentLocation.coordinate.latitude, currentLocation.coordinate.longitude];
    [self makeJSONRequestForLocation:location];
}

#pragma mark - Table view data source


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return _foursquareVenues.count;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    if (_foursquareVenues.count) {
        return 1;
    }
    return 0;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"IN TABLEVIEW");
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
        cell.textLabel.font = [UIFont boldSystemFontOfSize:12];
        cell.detailTextLabel.font = [UIFont systemFontOfSize:12];
        cell.detailTextLabel.textColor = [UIColor lightGrayColor];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
    cell.textLabel.text = _foursquareVenues[indexPath.row][@"venue"][@"name"];

    return cell;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
@end