Implement hashtag search on photo bomber app

self.hashtag = self.textField.text;
NSString *urlString = [[NSString alloc] initWithFormat:@"https://api.instagram.com/v1/tags/%@/media/recent?access_token=%@", self.hashtag,self.accessToken];
//run the rest of the instagram api download task stuff here as well

//
//  THPhotosViewController.m
//  Photo Bombers
//
//  Created by Sam Soffes on 1/28/14.
//  Copyright (c) 2014 Treehouse. All rights reserved.
//

#import "THPhotosViewController.h"
#import "THPhotoCell.h"
#import "THDetailViewController.h"
#import "THPresentDetailTransition.h"
#import "THDismissDetailTransition.h"

#import <SimpleAuth/SimpleAuth.h>

@interface THPhotosViewController () <UIViewControllerTransitioningDelegate> 
@property (nonatomic) NSString *accessToken;
@property (nonatomic) NSArray *photos;
@property (nonatomic) BOOL loading;
@property (nonatomic) NSString *hashtag;
@property (nonatomic) UITextField *textField;
@property (nonatomic) UISearchBar *searchBar;
@end

@implementation THPhotosViewController

- (void)setLoading:(BOOL)loading {
    _loading = loading;

    self.navigationItem.rightBarButtonItem.enabled = !_loading;
}

- (instancetype)init {
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    layout.itemSize = CGSizeMake(106.0, 106.0);
    layout.minimumInteritemSpacing = 1.0;
    layout.minimumLineSpacing = 1.0;

    return (self = [super initWithCollectionViewLayout:layout]);
}

- (void)viewDidLoad {
    [super viewDidLoad];

    //set default hashtag to whatever you want

    self.hashtag = @"breakfast";

    self.title = @"XYPIC";

    // TODO: Add a refresh right bar button item

    UIBarButtonItem *refreshButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(refresh)];
    self.navigationItem.rightBarButtonItem = refreshButton;

//    UIBarButtonItem *searchButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:@selector(searchHashtag)];
//    self.navigationItem.leftBarButtonItem = searchButton;

    //make search bar and set search delegate

    self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 200, 40)];
    self.searchBar.keyboardType = UIKeyboardTypeEmailAddress;
    self.searchBar.barStyle = UIBarStyleBlack;
    self.searchBar.placeholder = @"Hashtag";
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:_searchBar];
    self.searchBar.delegate = self;

    [self.collectionView registerClass:[THPhotoCell class] forCellWithReuseIdentifier:@"photo"];
    self.collectionView.backgroundColor = [UIColor whiteColor];

    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    self.accessToken = [userDefaults objectForKey:@"accessToken"];

    if (self.accessToken == nil) {
        [SimpleAuth authorize:@"instagram" options:@{@"scope": @[@"likes"]} completion:^(NSDictionary *responseObject, NSError *error) {

            self.accessToken = responseObject[@"credentials"][@"token"];

            [userDefaults setObject:self.accessToken forKey:@"accessToken"];
            [userDefaults synchronize];

            [self refresh];
        }];
    } else {
        [self refresh];
    }

}


- (void)refresh {
    if (self.loading) {
        return;
    }

    self.loading = YES;

    NSURLSession *session = [NSURLSession sharedSession];

    // You can change the hashtag here to make your very own photo browser app!
    NSString *urlString = [[NSString alloc] initWithFormat:@"https://api.instagram.com/v1/tags/%@/media/recent?access_token=%@", self.hashtag, self.accessToken];

    NSURL *url = [[NSURL alloc] initWithString:urlString];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
    NSURLSessionDownloadTask *task = [session downloadTaskWithRequest:request completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) {

        NSData *data = [[NSData alloc] initWithContentsOfURL:location];
        NSDictionary *responseDictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

        self.photos = [responseDictionary valueForKeyPath:@"data"];

        dispatch_async(dispatch_get_main_queue(), ^{
            [self.collectionView reloadData];
            self.loading = NO;
        });
    }];
    [task resume];
}


- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return [self.photos count];
}


- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    THPhotoCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"photo" forIndexPath:indexPath];

    cell.backgroundColor = [UIColor lightGrayColor];
    cell.photo = self.photos[indexPath.row];

    return cell;
}


- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {

    NSDictionary *photo = self.photos[indexPath.row];
    THDetailViewController *viewController = [[THDetailViewController alloc] init];
    viewController.modalPresentationStyle = UIModalPresentationCustom;
    viewController.transitioningDelegate = self;
    viewController.photo = photo;

    [self presentViewController:viewController animated:YES completion:nil];
}


- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
    return [[THPresentDetailTransition alloc] init];
}


- (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
    return [[THDismissDetailTransition alloc] init];
}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {

[searchBar resignFirstResponder];

    self.hashtag = searchBar.text;
    NSLog(@"hashtag : %@", self.hashtag);


    [self refresh];

}

@end