Ios 以编程方式传递数据时出现问题

我无法以编程方式将数据从一个UICollectionViewController传递到另一个UICollectionViewController

目前我的设置如下：

正在传递数据的UICollectionViewController（

RestaurantController

）

1a。UICollectionViewCell（

RestaurantCell

）

• 此UICollectionViewCell中有一个嵌套的UICollectionViewController和另一个自定义UICollectionViewCell（

  RestaurantCollectionViewCell

  ）

接收数据的UICollectionViewController（

MenuController

）

2a。UICollectionViewCell（

MenuCell

）

在我的

RestaurantCell

中，我从JSON加载数据，并将其附加到一个称为restaurants的新数组中：

var restaurants=[RestaurantModel]（）

。但是，当我尝试使用

var RestaurantModel？

在我的

MenuController

中加载餐厅名称或任何餐厅对象时，我得到的值为零。我有一种感觉，要么我的设置不正确，要么我在某处犯了一个愚蠢的错误。也许两者都有。我已经为每个类粘贴了下面的代码

其中值在MenuController内返回nil:

打印（“餐厅名称：”，餐厅？.Name）

打印（“餐厅Id:”，餐厅？.Id）

是自定义委派导致问题吗？

非常感谢您的帮助和建议

我的

餐厅控制器的内部

：

 import UIKit
 import FBSDKLoginKit

 class RestaurantController: UICollectionViewController, UICollectionViewDelegateFlowLayout, SWRevealViewControllerDelegate, UISearchBarDelegate, RestaurantDelegate {

var restaurantCell: RestaurantCell?

private let restaurantCellId = "restaurantCellId"

override func viewDidLoad() {
    super.viewDidLoad()

    collectionView?.backgroundColor = UIColor.qpizzaWhite()
    collectionView?.register(RestaurantCell.self, forCellWithReuseIdentifier: restaurantCellId)


    if self.revealViewController() != nil {
        navigationItem.leftBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "icon_menu_24dp").withRenderingMode(.alwaysOriginal), style: .plain, target: self.revealViewController(), action: #selector(SWRevealViewController.revealToggle(_:)))
        self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
    }

}

// FIXME: issue with this...navigationcontroller is presenting, not pushing ontop of stack view
func didTapRestaurantCell(cell: RestaurantCell) {
    print("Did Tap Restaurant Cell - Restaurant Controller")

    let layout = UICollectionViewFlowLayout()
    let controller = MenuController(collectionViewLayout: layout)
    navigationController?.pushViewController(controller, animated: true)

}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: restaurantCellId, for: indexPath) as! RestaurantCell
    cell.delegate = self
    return cell
}

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 1
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: view.frame.width, height: view.frame.height)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
    return 1
}
}

import UIKit

class MenuController: UICollectionViewController, UICollectionViewDelegateFlowLayout, SWRevealViewControllerDelegate {

private let menuCellId = "menuCellId"

var restaurant: RestaurantModel?
var menuItems = [MenuItemsModel]()

override func viewDidLoad() {
    super.viewDidLoad()

    collectionView?.backgroundColor = UIColor.qpizzaWhite()
    collectionView?.register(MenuCell.self, forCellWithReuseIdentifier: menuCellId)
    collectionView?.alwaysBounceVertical = true

    if self.revealViewController() != nil {
        navigationItem.leftBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "menu2-black-32").withRenderingMode(.alwaysOriginal), style: .plain, target: self.revealViewController(), action: #selector(SWRevealViewController.revealToggle(_:)))
        self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
    }

    print("Restaurant Name:", restaurant?.name) // returns nil
    if let restaurantName = restaurant?.name {
        self.navigationItem.title = restaurantName
    }

    loadMenuItems()

}

func loadMenuItems() {
    print("Restaurant Id:", restaurant?.id) // returns nil
    if let restaurantId = restaurant?.id {
        print("RestaurantId:", restaurantId)
    }
}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: menuCellId, for: indexPath) as! MenuCell
    return cell
}

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 3
}

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let layout = UICollectionViewFlowLayout()
    let controller = MenuDetailsController(collectionViewLayout: layout)
    navigationController?.pushViewController(controller, animated: true)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: view.frame.width, height: 120)
}

}

func didTapRestaurantCell(cell: RestaurantCell, withMenuController controller: MenuController) {
    print("Did Tap Restaurant Cell - Restaurant Controller")
    navigationController?.pushViewController(controller, animated: true)
}

在我的

餐厅小区内

：

protocol RestaurantDelegate {
    func didTapRestaurantCell(cell: RestaurantCell)
}


class RestaurantCell: BaseCell, UISearchBarDelegate, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {

var delegate: RestaurantDelegate?
var restaurants = [RestaurantModel]()
var filteredRestaurants = [RestaurantModel]()

private let restaurantCollectionViewCell = "restaurantCollectionViewCell"
private let activityIndicator = UIActivityIndicatorView()

lazy var searchBar: UISearchBar = {
    let sb = UISearchBar()
    sb.placeholder = "Search Restaurant"
    sb.barTintColor = .white
    UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).backgroundColor = UIColor.qpizzaWhite()
    sb.delegate = self
    return sb
}()

lazy var collectionView: UICollectionView = {
    let layout = UICollectionViewFlowLayout()
    let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
    cv.backgroundColor = .white
    return cv
}()

override func setupViews() {
    super.setupViews()
    collectionView.register(RestaurantCollectionViewCell.self, forCellWithReuseIdentifier: restaurantCollectionViewCell)
    collectionView.delegate = self
    collectionView.dataSource = self

    backgroundColor = UIColor.qpizzaRed()

    addSubview(searchBar)
    addSubview(collectionView)

    _ = searchBar.anchor(topAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 4, leftConstant: 4, bottomConstant: 0, rightConstant: 4, widthConstant: 0, heightConstant: 50)

    _ = collectionView.anchor(searchBar.bottomAnchor, left: leftAnchor, bottom: bottomAnchor, right: rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)

     loadRestaurants()

}

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    print(searchText)

    filteredRestaurants = self.restaurants.filter({ (restaruant: RestaurantModel) -> Bool in

        return restaruant.name?.lowercased().range(of: searchText.lowercased()) != nil
    })

    self.collectionView.reloadData()
}

// MARK - Helper Methods
func loadRestaurants() {

    showActivityIndicator()

    APIManager.shared.getRestaurants { (json) in
        if json != .null {
            //                print("Restaurant JSON:", json)
            self.restaurants = []

            if let restaurantList = json["restaurants"].array {
                for item in restaurantList {
                    let restaurant = RestaurantModel(json: item)
                    self.restaurants.append(restaurant)
                }
                self.collectionView.reloadData()
                self.hideActivityIndicator()
            }
        } else {
            print("Error loading JSON into Restaurant ViewController")
        }
    }
}

func loadImage(imageView: UIImageView, urlString: String) {

    let imageUrl: URL = URL(string: urlString)!
    URLSession.shared.dataTask(with: imageUrl) { (data, response, error) in
        if let error = error {
            print("Error loading image for Restaurant Controller:", error.localizedDescription)
        }
        guard let data = data, error == nil else { return }

        DispatchQueue.main.async(execute: {
            imageView.image = UIImage(data: data)
        })
        }.resume()
}

func showActivityIndicator() {
    activityIndicator.frame = CGRect(x: 0.0, y: 0.0, width: 40.0, height: 40.0)
    activityIndicator.center = center
    activityIndicator.hidesWhenStopped = true
    activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.whiteLarge
    activityIndicator.color = UIColor.qpizzaGold()

    addSubview(activityIndicator)
    activityIndicator.startAnimating()
}

func hideActivityIndicator() {
    activityIndicator.stopAnimating()
}

//MARK: CollectionView Delegate & DataSource Methods
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: restaurantCollectionViewCell, for: indexPath) as! RestaurantCollectionViewCell
    let restaurant: RestaurantModel

    if searchBar.text != "" {
        restaurant = filteredRestaurants[indexPath.item]
    } else {
        restaurant = restaurants[indexPath.item]
    }

    cell.restaurantNameLabel.text = restaurant.name
    cell.restaurantAddressLabel.text = restaurant.address

    if let logoName = restaurant.logo {
        let url = "\(logoName)"
        loadImage(imageView: cell.restaurantLogoImageView, urlString: url)
    }

    return cell
}


func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    if searchBar.text != "" {
        return self.filteredRestaurants.count
    }

    return self.restaurants.count
}

//FIXME: Restaurant Name Navigation Title is still not be passed from RestaurantCell to MenuController
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    print("Did Select Item - Restaurant Cell")

    let layout = UICollectionViewFlowLayout()
    let controller = MenuController(collectionViewLayout: layout)
    controller.restaurant = self.restaurants[indexPath.item]

    print("Controller", controller.restaurant) // Optional(QpizzaDelivery.RestaurantModel)
    print("Restaurant:", self.restaurants) // [QpizzaDelivery.RestaurantModel, QpizzaDelivery.RestaurantModel, QpizzaDelivery.RestaurantModel]
    print("IndexPath:", self.restaurants[indexPath.item]) // QpizzaDelivery.RestaurantModel

    delegate?.didTapRestaurantCell(cell: self)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: frame.width, height: 200)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
    return 0.5
}

}

我的

菜单控制器的内部

：

 import UIKit
 import FBSDKLoginKit

 class RestaurantController: UICollectionViewController, UICollectionViewDelegateFlowLayout, SWRevealViewControllerDelegate, UISearchBarDelegate, RestaurantDelegate {

var restaurantCell: RestaurantCell?

private let restaurantCellId = "restaurantCellId"

override func viewDidLoad() {
    super.viewDidLoad()

    collectionView?.backgroundColor = UIColor.qpizzaWhite()
    collectionView?.register(RestaurantCell.self, forCellWithReuseIdentifier: restaurantCellId)


    if self.revealViewController() != nil {
        navigationItem.leftBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "icon_menu_24dp").withRenderingMode(.alwaysOriginal), style: .plain, target: self.revealViewController(), action: #selector(SWRevealViewController.revealToggle(_:)))
        self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
    }

}

// FIXME: issue with this...navigationcontroller is presenting, not pushing ontop of stack view
func didTapRestaurantCell(cell: RestaurantCell) {
    print("Did Tap Restaurant Cell - Restaurant Controller")

    let layout = UICollectionViewFlowLayout()
    let controller = MenuController(collectionViewLayout: layout)
    navigationController?.pushViewController(controller, animated: true)

}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: restaurantCellId, for: indexPath) as! RestaurantCell
    cell.delegate = self
    return cell
}

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 1
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: view.frame.width, height: view.frame.height)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
    return 1
}
}

import UIKit

class MenuController: UICollectionViewController, UICollectionViewDelegateFlowLayout, SWRevealViewControllerDelegate {

private let menuCellId = "menuCellId"

var restaurant: RestaurantModel?
var menuItems = [MenuItemsModel]()

override func viewDidLoad() {
    super.viewDidLoad()

    collectionView?.backgroundColor = UIColor.qpizzaWhite()
    collectionView?.register(MenuCell.self, forCellWithReuseIdentifier: menuCellId)
    collectionView?.alwaysBounceVertical = true

    if self.revealViewController() != nil {
        navigationItem.leftBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "menu2-black-32").withRenderingMode(.alwaysOriginal), style: .plain, target: self.revealViewController(), action: #selector(SWRevealViewController.revealToggle(_:)))
        self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
    }

    print("Restaurant Name:", restaurant?.name) // returns nil
    if let restaurantName = restaurant?.name {
        self.navigationItem.title = restaurantName
    }

    loadMenuItems()

}

func loadMenuItems() {
    print("Restaurant Id:", restaurant?.id) // returns nil
    if let restaurantId = restaurant?.id {
        print("RestaurantId:", restaurantId)
    }
}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: menuCellId, for: indexPath) as! MenuCell
    return cell
}

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 3
}

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let layout = UICollectionViewFlowLayout()
    let controller = MenuDetailsController(collectionViewLayout: layout)
    navigationController?.pushViewController(controller, animated: true)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: view.frame.width, height: 120)
}

}

func didTapRestaurantCell(cell: RestaurantCell, withMenuController controller: MenuController) {
    print("Did Tap Restaurant Cell - Restaurant Controller")
    navigationController?.pushViewController(controller, animated: true)
}

我的

菜单的内部

import UIKit

class MenuCell: BaseCell {

let restaurantLabel: UILabel = {
    let label = UILabel()
    label.text = "Restaurant King"
    label.font = UIFont.boldSystemFont(ofSize: 16)
    label.textColor = .black
    label.numberOfLines = 0
    return label
}()

let mealImageView: UIImageView = {
    let iv = UIImageView()
    iv.image = #imageLiteral(resourceName: "button_chicken").withRenderingMode(.alwaysOriginal)
    iv.contentMode = .scaleAspectFill
    iv.clipsToBounds = true
    return iv
}()

let mealDetailsLabel: UILabel = {
    let label = UILabel()
    label.text = "Grass fed grass, American cheese, and friez"
    label.font = UIFont.boldSystemFont(ofSize: 12)
    label.textColor = UIColor.qpizzaBlack()
    label.numberOfLines = 0
    return label
}()

let mealPriceLabel: UILabel = {
    let label = UILabel()
    label.text = "$12.00"
    label.font = UIFont.boldSystemFont(ofSize: 12)
    label.textColor = UIColor.qpizzaBlack()
    return label
}()

let sepereatorView: UIView = {
    let view = UIView()
    view.backgroundColor = UIColor.lightGray
    return view
}()


override func setupViews() {
    super.setupViews()

    backgroundColor = UIColor.qpizzaWhite()

    addSubview(restaurantLabel)
    addSubview(mealImageView)
    addSubview(mealDetailsLabel)
    addSubview(mealPriceLabel)
    addSubview(sepereatorView)

    _ = mealImageView.anchor(topAnchor, left: nil, bottom: nil, right: rightAnchor, topConstant: 14, leftConstant: 0, bottomConstant: 0, rightConstant: 12, widthConstant: 60, heightConstant: 60)
    _ = restaurantLabel.anchor(topAnchor, left: leftAnchor, bottom: nil, right: mealImageView.leftAnchor, topConstant: 14, leftConstant: 12, bottomConstant: 0, rightConstant: 10, widthConstant: 0, heightConstant: 20)
    _ = mealDetailsLabel.anchor(restaurantLabel.bottomAnchor, left: leftAnchor, bottom: nil, right: mealImageView.leftAnchor, topConstant: 12, leftConstant: 12, bottomConstant: 0, rightConstant: 10, widthConstant: 0, heightConstant: 30)
    _ = mealPriceLabel.anchor(mealDetailsLabel.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 10, leftConstant: 12, bottomConstant: 10, rightConstant: 10, widthConstant: 0, heightConstant: 20)
    _ = sepereatorView.anchor(nil, left: leftAnchor, bottom: bottomAnchor, right: rightAnchor, topConstant: 0, leftConstant: 20, bottomConstant: 4, rightConstant: 20, widthConstant: 0, heightConstant: 1)


}
}

protocol RestaurantDelegate {
    func didTapRestaurantCell(cell: RestaurantCell, withMenuController: MenuController)
}


func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    print("Did Select Item - Restaurant Cell")

    let layout = UICollectionViewFlowLayout()
    let controller = MenuController(collectionViewLayout: layout)
    controller.restaurant = self.restaurants[indexPath.item]
    delegate?.didTapRestaurantCell(cell: self, withMenuController: controller)
}

简单看一下，首先声明一个正确类型的变量。但实际上，您必须执行赋值（=）才能将数据或类引用从一个类移动到下一个类

func didTapRestaurantCell(cell: RestaurantCell) {
  print("Did Tap Restaurant Cell - Restaurant Controller")

  let layout = UICollectionViewFlowLayout()
  let controller = MenuController(collectionViewLayout: layout)
  navigationController?.pushViewController(controller, animated: true)

  // you need to set the restaurant attribute of your new 
  // controller
  let indexPath = indexPath(for: cell)
  controller.restaurant = self.restaurants[indexPath.item]
}

谢谢大家的评论，并帮助我弄明白这一点。我可以通过更改协议并将控制器作为参数传递来解决问题

在
RestaurantCell
中：

import UIKit

class MenuCell: BaseCell {

let restaurantLabel: UILabel = {
    let label = UILabel()
    label.text = "Restaurant King"
    label.font = UIFont.boldSystemFont(ofSize: 16)
    label.textColor = .black
    label.numberOfLines = 0
    return label
}()

let mealImageView: UIImageView = {
    let iv = UIImageView()
    iv.image = #imageLiteral(resourceName: "button_chicken").withRenderingMode(.alwaysOriginal)
    iv.contentMode = .scaleAspectFill
    iv.clipsToBounds = true
    return iv
}()

let mealDetailsLabel: UILabel = {
    let label = UILabel()
    label.text = "Grass fed grass, American cheese, and friez"
    label.font = UIFont.boldSystemFont(ofSize: 12)
    label.textColor = UIColor.qpizzaBlack()
    label.numberOfLines = 0
    return label
}()

let mealPriceLabel: UILabel = {
    let label = UILabel()
    label.text = "$12.00"
    label.font = UIFont.boldSystemFont(ofSize: 12)
    label.textColor = UIColor.qpizzaBlack()
    return label
}()

let sepereatorView: UIView = {
    let view = UIView()
    view.backgroundColor = UIColor.lightGray
    return view
}()


override func setupViews() {
    super.setupViews()

    backgroundColor = UIColor.qpizzaWhite()

    addSubview(restaurantLabel)
    addSubview(mealImageView)
    addSubview(mealDetailsLabel)
    addSubview(mealPriceLabel)
    addSubview(sepereatorView)

    _ = mealImageView.anchor(topAnchor, left: nil, bottom: nil, right: rightAnchor, topConstant: 14, leftConstant: 0, bottomConstant: 0, rightConstant: 12, widthConstant: 60, heightConstant: 60)
    _ = restaurantLabel.anchor(topAnchor, left: leftAnchor, bottom: nil, right: mealImageView.leftAnchor, topConstant: 14, leftConstant: 12, bottomConstant: 0, rightConstant: 10, widthConstant: 0, heightConstant: 20)
    _ = mealDetailsLabel.anchor(restaurantLabel.bottomAnchor, left: leftAnchor, bottom: nil, right: mealImageView.leftAnchor, topConstant: 12, leftConstant: 12, bottomConstant: 0, rightConstant: 10, widthConstant: 0, heightConstant: 30)
    _ = mealPriceLabel.anchor(mealDetailsLabel.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 10, leftConstant: 12, bottomConstant: 10, rightConstant: 10, widthConstant: 0, heightConstant: 20)
    _ = sepereatorView.anchor(nil, left: leftAnchor, bottom: bottomAnchor, right: rightAnchor, topConstant: 0, leftConstant: 20, bottomConstant: 4, rightConstant: 20, widthConstant: 0, heightConstant: 1)


}
}

protocol RestaurantDelegate {
    func didTapRestaurantCell(cell: RestaurantCell, withMenuController: MenuController)
}


func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    print("Did Select Item - Restaurant Cell")

    let layout = UICollectionViewFlowLayout()
    let controller = MenuController(collectionViewLayout: layout)
    controller.restaurant = self.restaurants[indexPath.item]
    delegate?.didTapRestaurantCell(cell: self, withMenuController: controller)
}

在
餐厅控制器中
：

 import UIKit
 import FBSDKLoginKit

 class RestaurantController: UICollectionViewController, UICollectionViewDelegateFlowLayout, SWRevealViewControllerDelegate, UISearchBarDelegate, RestaurantDelegate {

var restaurantCell: RestaurantCell?

private let restaurantCellId = "restaurantCellId"

override func viewDidLoad() {
    super.viewDidLoad()

    collectionView?.backgroundColor = UIColor.qpizzaWhite()
    collectionView?.register(RestaurantCell.self, forCellWithReuseIdentifier: restaurantCellId)


    if self.revealViewController() != nil {
        navigationItem.leftBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "icon_menu_24dp").withRenderingMode(.alwaysOriginal), style: .plain, target: self.revealViewController(), action: #selector(SWRevealViewController.revealToggle(_:)))
        self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
    }

}

// FIXME: issue with this...navigationcontroller is presenting, not pushing ontop of stack view
func didTapRestaurantCell(cell: RestaurantCell) {
    print("Did Tap Restaurant Cell - Restaurant Controller")

    let layout = UICollectionViewFlowLayout()
    let controller = MenuController(collectionViewLayout: layout)
    navigationController?.pushViewController(controller, animated: true)

}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: restaurantCellId, for: indexPath) as! RestaurantCell
    cell.delegate = self
    return cell
}

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 1
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: view.frame.width, height: view.frame.height)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
    return 1
}
}

import UIKit

class MenuController: UICollectionViewController, UICollectionViewDelegateFlowLayout, SWRevealViewControllerDelegate {

private let menuCellId = "menuCellId"

var restaurant: RestaurantModel?
var menuItems = [MenuItemsModel]()

override func viewDidLoad() {
    super.viewDidLoad()

    collectionView?.backgroundColor = UIColor.qpizzaWhite()
    collectionView?.register(MenuCell.self, forCellWithReuseIdentifier: menuCellId)
    collectionView?.alwaysBounceVertical = true

    if self.revealViewController() != nil {
        navigationItem.leftBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "menu2-black-32").withRenderingMode(.alwaysOriginal), style: .plain, target: self.revealViewController(), action: #selector(SWRevealViewController.revealToggle(_:)))
        self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
    }

    print("Restaurant Name:", restaurant?.name) // returns nil
    if let restaurantName = restaurant?.name {
        self.navigationItem.title = restaurantName
    }

    loadMenuItems()

}

func loadMenuItems() {
    print("Restaurant Id:", restaurant?.id) // returns nil
    if let restaurantId = restaurant?.id {
        print("RestaurantId:", restaurantId)
    }
}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: menuCellId, for: indexPath) as! MenuCell
    return cell
}

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 3
}

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let layout = UICollectionViewFlowLayout()
    let controller = MenuDetailsController(collectionViewLayout: layout)
    navigationController?.pushViewController(controller, animated: true)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: view.frame.width, height: 120)
}

}

func didTapRestaurantCell(cell: RestaurantCell, withMenuController controller: MenuController) {
    print("Did Tap Restaurant Cell - Restaurant Controller")
    navigationController?.pushViewController(controller, animated: true)
}

我已经有一段时间没有使用CollectionView了，但是为什么
didSelectItemAtIndexPath
在单元格中而不是控制器中？显然，您还创建了两个不同的
MenuController
实例，一个在单元格的
didSelectItemAtIndexPath
方法中，另一个在
RestaurantDelegate
didTapRestaurantCell

方法中，该方法不设置

restaurant

属性。在第一个示例中，您设置了RestaurantCell，但该控制器实例只是挂起了一点&没有使用-它不是导航控制器推送的实例。

didSelectItemAtIndexPath'位于

RestaurantCell`内，因为我在

RestaurantCell

内有一个嵌套的UICollectionViewController。您的说法是正确的，我正在创建两个不同的

MenuController

。我不知道如何在不创建新实例的情况下引用

RestaurantCell

内部的

MenuController

，你有什么建议吗？我需要

RestaurantController

中的

MenuController

的第一个实例将导航控制器推到堆栈上，然后推到

MenuController

中的第二个实例

RestaurantCell

获取我的

MenuController

@a2b123上的

restaurant

（它引用了我的餐厅模型）的引用为什么要将单元格传递回controller类？为什么不把数据传回去，然后把数据分离出来呢？您的协议应该保存类型为restaurants（这是您的模型数组）的数据，当您点击一个单元格时，您可以获取该单元格的数据，并将其交给协议，它会将其委托回控制器类，然后您的segue会将其交给另一个类。@a2b123我的意思是委托部分，您在其中传递单元格，只需将点击的单元格数据传回，当调用返回到控制器类时，您可以将数据发送到第二类。如何在我的

RestaurantController中访问
餐厅
。我已经在我的
RestaurantCell
中声明了该变量。另外，如何在我的
RestaurantController
中访问
indexath.item
@阿哈尔。我尝试过多次使用这种方法，但我不确定如何访问这些片段。这还不够，您必须将单元格映射到
数组中的元素。我看不出您首先是如何填充单元格的返回指定单元格的索引路径。
很抱歉，我没有遵循您的全部代码。。。但缺少的是在创建MenuController之后对其属性值的实际赋值（=）。声明正确类型的属性是必要的第一步，下一步是为类的实际实例赋值