GenericCollectionViewController

GenericCollectionViewController.swift

//  Created by Angel Cortez on 3/30/18.
//  Copyright © 2018 Angel Cortez. All rights reserved.
//
// This an adaptation of Brian Voong's GenericTableViewController
import UIKit

class GenericCell<U>: UITableViewCell {
    var item: U!
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        setupViews()
    }
    
    func setupViews() {}
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

class GenericTableViewController<T: GenericCell<U>, U>: UITableViewController {
    
    var items = [U]()
    
    func setupTableView(){}
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let reuseIdentifier = NSStringFromClass(T.self)
        tableView.register(T.self, forCellReuseIdentifier: reuseIdentifier)
        setupTableView()
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 1
    }
    
    override func numberOfSections(in tableView: UITableView) -> Int {
        return items.count
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let identifier = NSStringFromClass(T.self)
        let cell = tableView.dequeueReusableCell(withIdentifier: identifier, for: indexPath) as! T
        cell.item = items[indexPath.section]
        return cell
    }
    
    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return super.tableView(tableView, titleForHeaderInSection: section)
    }
}

class GenericViewController<T: GenericCell<U>, U>: UIViewController, UITableViewDelegate, UITableViewDataSource{
    
    var items = [U]() {
        didSet{
            DispatchQueue.main.async {
                self.tableView.reloadData()
            }
        }
    }
    var tableView = UITableView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.delegate = self
        tableView.dataSource = self
        let reuseIdentifier = NSStringFromClass(T.self)
        tableView.register(T.self, forCellReuseIdentifier: reuseIdentifier)
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return items.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let identifier = NSStringFromClass(T.self)
        let cell = tableView.dequeueReusableCell(withIdentifier: identifier, for: indexPath) as! T
        cell.item = items[indexPath.row]
        return cell
    }
    
    
    func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
    }
    
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
    }
    
    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
    }
    
    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
    }
    
}

class GenericCollectionViewCell<U>: UICollectionViewCell {
    var item: U!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupViews()
    }
    
    func setupViews() {}
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

class GenericCollectionView<T: GenericCollectionViewCell<U>, U>: UIView, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, UIGestureRecognizerDelegate {
    var items = [U]()
    {
        didSet{
            DispatchQueue.main.async {
                self.collectionView.reloadData()
            }
        }
    }
    var numberOfSections: Int?
    let collectionView = UICollectionView(frame: CGRect(x: 0, y: 0, width: 0, height: 0), collectionViewLayout: UICollectionViewFlowLayout())
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        collectionView.dataSource = self
        collectionView.delegate = self
        self.addSubview(collectionView)
        setupCollectionView()
        let reuseIdentifer = NSStringFromClass(T.self)
        collectionView.register(T.self, forCellWithReuseIdentifier: reuseIdentifer)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func setupCollectionView() {}
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return items.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let identifer = NSStringFromClass(T.self)
        var cell = collectionView.dequeueReusableCell(withReuseIdentifier: identifer, for: indexPath) as! T
        cell.item = items[indexPath.row]
        
        //        if cell.gestureRecognizers?.count == nil {
        //            let tap = UITapGestureRecognizer(target: self, action: #selector(cellTapped))
        //            tap.allowedPressTypes  = [NSNumber(value: UIPressType.select.rawValue)]
        //            cell.addGestureRecognizer(tap)
        //        }
        return cell
    }
    
    //    @objc func cellTapped(gesture: UITapGestureRecognizer) {}
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    }
    
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return (numberOfSections == nil) ? 1: numberOfSections!
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: 385, height: 601)
    }
}

class GenericCollectionViewController<T: GenericCollectionViewCell<U>, U>: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, UIGestureRecognizerDelegate {
    var items = [[U]](){
        didSet{
            DispatchQueue.main.async {
                self.collectionView.reloadData()
            }
        }
    }
    var numberOfSections: Int?
    let collectionView = UICollectionView(frame: CGRect(x: 0, y: 0, width: 0, height: 0), collectionViewLayout: UICollectionViewFlowLayout())
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        collectionView.dataSource = self
        collectionView.delegate = self
        view.addSubview(collectionView)
        setupCollectionView()
        let reuseIdentifer = NSStringFromClass(T.self)
        collectionView.register(T.self, forCellWithReuseIdentifier: reuseIdentifer)
    }
    
    func setupCollectionView() {}
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return (section < items.count) ? items[section].count : 0
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let identifer = NSStringFromClass(T.self)
        var cell = collectionView.dequeueReusableCell(withReuseIdentifier: identifer, for: indexPath) as! T
        cell.item = items[indexPath.section][indexPath.row]
        
        if cell.gestureRecognizers?.count == nil {
            let tap = UITapGestureRecognizer(target: self, action: #selector(cellTapped))
            tap.allowedPressTypes  = [NSNumber(value: UIPress.PressType.select.rawValue)]
            cell.addGestureRecognizer(tap)
        }
        return cell
    }
    
    @objc func cellTapped(gesture: UITapGestureRecognizer) {}
    
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return (numberOfSections == nil) ? 1: numberOfSections!
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: 385, height: 601)
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
        
        return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
    }
}