A search ViewController from a meal planning app I'm working on in my spare time.

SearchVC.swift

//
//  SearchVC.swift
//  Meals
//
//  Created by Caleb Stultz on 9/26/18.
//  Copyright © 2018 Caleb Stultz. All rights reserved.
//

/*
 Code is from a collaborative meal planning app I'm building. This ViewController allows a user to enter an ingredient as a search query into a UISearchBar instance and search for recipes with that ingredient present. Each UITableViewCell has an image of type CustomImageView that allows for synchronous image caching/loading in the background.
*/

import UIKit
import SafariServices

class SearchVC: UIViewController, UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate, UITextFieldDelegate {
    
    @IBOutlet weak var tableView: UITableView!
    @IBOutlet weak var searchBar: UISearchBar!
    @IBOutlet weak var spinner: UIActivityIndicatorView!
    
    var recipes: [Recipe] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.delegate = self
        tableView.dataSource = self
        
        searchBar.delegate = self
        searchBar.becomeFirstResponder()
        
        spinner.isHidden = true
    }
        
    @IBAction func dismiss(_ sender: Any) {
        searchBar.resignFirstResponder()
        dismiss(animated: true, completion: nil)
    }
    
    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
        guard let query = searchBar.text else { return }
        if query != "" {
            spinner.isHidden = false
            spinner.startAnimating()
            searchBar.resignFirstResponder()
            NetworkManager.searchRecipes(withQuery: query) { (recipes) in
                self.recipes = recipes
                DispatchQueue.main.async {
                    self.tableView.reloadData()
                    self.spinner.stopAnimating()
                    self.spinner.isHidden = true
                }
            }
        }
    }
    
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        if searchText == "" {
            recipes = []
            tableView.reloadData()
        }
    }
    
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return recipes.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: "recipeCell", for: indexPath) as? RecipeCell else { return UITableViewCell() }
        cell.configureCell(recipe: recipes[indexPath.row])
        cell.foodImageView.loadImage(fromURLString: recipes[indexPath.row].imageURLString)
        return cell
    }
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        guard let sourceUrl = URL(string: recipes[indexPath.row].sourceURLString) else { return }
        let vc = SFSafariViewController(url: sourceUrl)
        present(vc, animated: true, completion: nil)
    }
}