将数据传递到使用MVP模式的iOS另一控制器

Question

我使用的MVP设计模式。我必须将数据传递给我将在下文提到的另一个视图控制器的两种方法。我不知道哪个是正确的，不违反MVP模式。我知道这是很大的问题，但它真的很重要。

1）使用init with presenter，下面我通过使演示者哪个视图控制器需要创建视图控制器。

struct HotelTemplate {
    var id: String
    var name: String
    var icon: String
}

class ListHotelPresenter: NSObject {

    private var data = [HotelTemplate]()

    func getPresenter(_ index: Int) -> HotelDetailsPresenter {
        let presenter = HotelDetailsPresenter(id: data[index].id, name: data[index].name, icon: data[index].icon)
        return presenter
    }
}

// InitialViewController
class ListHotelViewController: UIViewController {

    class func `init`(with presenter: ListHotelPresenter) -> ListHotelViewController {
        let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "ListHotelViewController") as! ListHotelViewController
        vc.presenter = presenter
        return vc
    }

    var presenter: ListHotelPresenter!

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let detailPresenter = presenter.getPresenter(indexPath.row)
        let vc = HotelDetailsViewController.init(with: detailPresenter)
        self.navigationController?.pushViewController(vc, animated: true)
    }
}

// ViewController that will be push
class HotelDetailsViewController: UIViewController {

    class func `init`(with presenter: HotelDetailsPresenter) -> HotelDetailsViewController {
        let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "HotelDetailsViewController") as! HotelDetailsViewController
        return vc
    }

    var presenter: HotelDetailsPresenter!

    override func viewDidLoad() {
        super.viewDidLoad()

        presenter.loadHoteData()
    }
}

class HotelDetailsPresenter: NSObject {
    var hotelId: String
    var hotelName: String
    var hotelIcon: String

    init(id: String, name: String, icon: String) {
        self.hotelId = id
        self.hotelName = name
        self.hotelIcon = icon
    }

    func loadHoteData() {
        // Load hotel data.
        // Alamofire.request ..................
    }
}

2）通过在id, name, icon发送viewDidLoad()然后初始化演示

struct HotelTemplate {
    var id: String
    var name: String
    var icon: String
}

class ListHotelPresenter: NSObject {

    private var data = [HotelTemplate]()

    func getHotelName(_ index: Int) -> String {
        return data[index].name
    }

    func getHotelIcon(_ index: Int) -> String {
        return data[index].icon
    }

    func getHotelId(_ index: Int) -> String {
        return data[index].id
    }
}

class ListHotelViewController: UIViewController {

    var presenter: ListHotelPresenter!

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "HotelDetailsViewController") as! HotelDetailsViewController
        vc.id = presenter.getHotelId(indexPath.row)
        vc.name = presenter.getHotelName(indexPath.row)
        vc.icon = presenter.getHotelIcon(indexPath.row)
        self.navigationController?.pushViewController(vc, animated: true)
    }
}

class HotelDetailsViewController: UIViewController {

    var presenter: HotelDetailsPresenter!
    var id = ""
    var name = ""
    var icon = ""

    override func viewDidLoad() {
        super.viewDidLoad()
        presenter = HotelDetailsPresenter(id: id, name: name, icon: icon)
        presenter.loadHoteData()
    }
}

class HotelDetailsPresenter: NSObject {
    var hotelId: String
    var hotelName: String
    var hotelIcon: String

    init(id: String, name: String, icon: String) {
        self.hotelId = id
        self.hotelName = name
        self.hotelIcon = icon
    }

    func loadHoteData() {
        // Load hotel data.
        // Alamofire.request ..................
    }
}

所以，下面是我的顾虑：

1）哪一个是正确的？ （我觉得第一种方法是真的很干净，但是我的前辈告诉我，这违反了MVP模式，我不知道怎么办。）

2）如果控制器的主持人属性是公共或私有？

Answer 1

在Objective-C，你可以有各地通过模型的视图。我们可以前瞻性声明在视图控制器的头文件的模型：

@class HotelTemplate;

在.m文件，我会确保不"#import HotelTemplate.h"。这样一来，该模型依然不透明。你可以通过它身边，但你不能看里面。

我不知道有什么方法在斯威夫特执行此操作。因此，让我跟着你的榜样，并传递，而不是下一个模型的下一个主持人。我们需要的是设置在viewDidLoad()每个主持人的视图的方式。为了防止保留周期，这将是一个微弱的属性。

首先，这里的列表视图控制器。我做了一个UITableViewController。

final class ListHotelViewController: UITableViewController {
    private var presenter = ListHotelPresenter()

    override func viewDidLoad() {
        super.viewDidLoad()
        presenter.setView(self)
        presenter.loadHotelData()
    }
}

主讲人将其称之为回通过协议：

protocol ListHotelView: class {
    func redraw()
    func showDetails(nextPresenter: HotelDetailsPresenter)
}

extension ListHotelViewController: ListHotelView {
    func redraw() {
        tableView.reloadData()
    }

    func showDetails(nextPresenter: HotelDetailsPresenter) {
        let vc = HotelDetailsViewController.init(with: nextPresenter)
        navigationController?.pushViewController(vc, animated: true)
    }
}

下面是表视图的数据源和委托：

extension ListHotelViewController /* UITableViewDataSource */ {
    public override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return presenter.hotelCount
    }

    public override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Hotel", for: indexPath) as! HotelTableViewCell
        presenter.configure(cell: cell, row: indexPath.row)
        return cell
    }
}

extension ListHotelViewController /* UITableViewDelegate */ {
    public override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        presenter.showDetails(row: indexPath.row)
    }
}

在每一步，它推迟到演示。发言人的薄弱环节返回查看，但只能通过该协议。它不知道这个视图是一个ListHotelViewController。我们应该能够实现与一群print(_)报表视图相反，基于终端的接口。

final class ListHotelPresenter {
    private weak var view: ListHotelView?
    private var model: [HotelTemplate] = [] {
        didSet {
            view?.redraw()
        }
    }

    var hotelCount: Int {
        return model.count
    }

    func setView(_ view: ListHotelView) {
        self.view = view
    }

    func loadHotelData() {
        // Network request to load data into model. Let's pretend with dummy data:
        let hilton = HotelTemplate(id: "hilton", name: "Hilton", icon: "H")
        let radisson = HotelTemplate(id: "radisson", name: "Radisson", icon: "R")
        model = [hilton, radisson]
    }

    func configure(cell: HotelCell, row: Int) {
        let hotel = model[row]
        cell.show(name: hotel.name, icon: hotel.icon)
    }

    func showDetails(row: Int) {
        let nextPresenter = HotelDetailsPresenter(summaryModel: model[row])
        view?.showDetails(nextPresenter: nextPresenter)
    }
}

在configure(cell:row:)，演示会谈给定的细胞。请注意，电池也是一个协议。随着MVP，我真的试着去想像我是多么想用它来制作一个基于终端的接口。这里的细胞：

protocol HotelCell: class {
    func show(name: String, icon: String)
}

final class HotelTableViewCell: UITableViewCell {}

extension HotelTableViewCell: HotelCell {
    func show(name: String, icon: String) {
        textLabel?.text = name
        // Do something to show icon
    }
}

在实践中，你会添加更多的表视图单元格。我只是用一个简单的细胞，并在这个例子中的文本标签。

最后，我们来推视图控制器。

final class HotelDetailsViewController: UIViewController {
    private var presenter: HotelDetailsPresenter!
    @IBOutlet private var textLabel: UILabel!

    static func `init`(with presenter: HotelDetailsPresenter) -> HotelDetailsViewController {
        let vc = UIStoryboard(name: "Main", bundle: nil)
                .instantiateViewController(withIdentifier: "HotelDetailsViewController")
                as! HotelDetailsViewController
        vc.presenter = presenter
        return vc
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        presenter.setView(self)
        presenter.show()
    }
}

我正在做的假设，我们将立即显示我们的摘要信息，但有更多的细节来自Web服务。这是该演示完成。

struct HotelDetails {
    let location: String
    // more details…
}

final class HotelDetailsPresenter {
    private weak var view: HotelDetailsView?
    private let summaryModel: HotelTemplate        
    private var detailsModel: HotelDetails? {
        didSet {
            guard let detailsModel = detailsModel else { return }
            view?.showDetails(location: detailsModel.location)
        }
    }

    init(summaryModel: HotelTemplate) {
        self.summaryModel = summaryModel
    }

    func setView(_ view: HotelDetailsView) {
        self.view = view
    }

    func show() {
        view?.show(name: summaryModel.name, icon: summaryModel.icon)
        // Network request to load data into detailsModel
    }
}

像往常一样，主持人告诉视图如何通过协议做：

protocol HotelDetailsView: class {
    func show(name: String, icon: String)
    func showDetails(location: String)
}

extension HotelDetailsViewController: HotelDetailsView {
    func show(name: String, icon: String) {
        textLabel?.text = name
        // Do something to show icon
    }

    func showDetails(location: String) {
        // Show other hotel details we loaded
    }
}

正如你所看到的，属性是私有的。为了支持单元测试，我们可能需要在使用private(set)所以只有制定者是私人放松。

Answer 2

嘿，按照苹果的指导Model-View-Controller两者都不错，但第二个是更具可读性和易于理解，以第一次有了一些变化，请检查代码。

class ListHotelViewController: UIViewController{
private var presenter: ListHotelPresenter!

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "HotelDetailsViewController") as! HotelDetailsViewController
    vc.objHotelTemplate = presenter.getHotelTemplate(indexPath.row)
    self.navigationController?.pushViewController(vc, animated: true)
}
}
class HotelDetailsViewController: UIViewController {

private var presenter: HotelDetailsPresenter!
var objHotelTemplate:HotelTemplate!

override func viewDidLoad() {
    super.viewDidLoad()
    presenter = HotelDetailsPresenter(id: objHotelTemplate.id, name: objHotelTemplate.name, icon: objHotelTemplate.icon)
    presenter.loadHoteData()
}

}