使用MVP模式iOS将数据传递给另一个控制器
我使用的是MVP设计模式。我有两种方法将数据传递给另一个视图控制器,我将在下面提到。我不知道哪一个是正确的,也不违反MVP模式。我知道这是一个很大的问题,但它确实非常重要 1) 在下面使用带演示者的使用MVP模式iOS将数据传递给另一个控制器,ios,swift,mvp,Ios,Swift,Mvp,我使用的是MVP设计模式。我有两种方法将数据传递给另一个视图控制器,我将在下面提到。我不知道哪一个是正确的,也不违反MVP模式。我知道这是一个很大的问题,但它确实非常重要 1) 在下面使用带演示者的init,我通过传递视图控制器所需的演示者来创建视图控制器 struct HotelTemplate { var id: String var name: String var icon: String } class ListHotelPresenter: NSObject
init
,我通过传递视图控制器所需的演示者来创建视图控制器
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) 通过发送id、名称、图标
,然后在viewDidLoad()中初始化演示者
因此,以下是我关注的问题:
1) 哪一个是正确的?(我觉得第一种方法非常干净,但我的上级告诉我它违反了MVP模式。我不知道怎么做。)
2) 控制器的presenter属性应该是公共的还是私有的?嘿,根据苹果的指导,两者都可以,但是第二个属性对第一个属性来说更易读,更容易理解,但有一些更改,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()
}
}嘿,根据苹果公司的指导,两者都可以,但第二个版本对第一个版本更具可读性,也更容易理解,但有一些改动,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()
}
}在Objective-C中,您可以看到一个模型的视图。我们可以在视图控制器的头文件中向前声明模型:
@class HotelTemplate;
在.m文件中,我确保不导入HotelTemplate.h“”。这样,模型仍然不透明。你可以传来传去,但你不能看里面
我不知道有什么办法可以在Swift中强制执行。因此,让我按照您的示例传递下一个演示者,而不是下一个模型。我们所需要的只是在viewDidLoad()
中设置每个演示者的视图。为了防止保留循环,这将是一个弱属性
首先,这里是列表视图控制器。我做了一个UITableViewController
final class ListHotelViewController: UITableViewController {
private var presenter = ListHotelPresenter()
override func viewDidLoad() {
super.viewDidLoad()
presenter.setView(self)
presenter.loadHotelData()
}
}
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()
}
}
演示者将通过协议将其回调:
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)
}
}
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
}
}
以下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)
}
}
在每一步中,它都服从于演示者。演示者具有返回视图的弱链接,但仅通过协议。它不知道该视图是ListHotelViewController。对于基于终端的接口,我们应该能够用一堆print(41;
语句来实现视图
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)
}
}
在配置(单元格:行:)
中,演示者与给定单元格对话。请注意,该单元也是一个协议。有了MVP,我真的试着想象我将如何使用它来制作一个基于终端的界面。这是手机:
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
}
}
实际上,您应该向“表视图”单元格添加更多内容。在这个示例中,我只使用了一个普通单元格及其文本标签
最后,我们来看看推式视图控制器
final class ListHotelViewController: UITableViewController {
private var presenter = ListHotelPresenter()
override func viewDidLoad() {
super.viewDidLoad()
presenter.setView(self)
presenter.loadHotelData()
}
}
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()
}
}
我假设我们将立即显示我们拥有的摘要信息,但web服务中还有更多细节。这是由该演示者完成的
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
}
}
与往常一样,演示者通过协议告诉视图要做什么:
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)
}
}
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
}
}
如您所见,这些属性是私有的。为了支持单元测试,我们可能需要放宽使用
private(set)
的限制,以便只有setter是私有的。在Objective-C中,您可以看到传递模型的视图。我们可以在视图控制器的头文件中向前声明模型:
@class HotelTemplate;
在.m文件中,我确保不导入HotelTemplate.h“”。这样,模型仍然不透明。你可以传来传去,但你不能看里面
我不知道有什么办法可以在Swift中强制执行。因此,让我按照您的示例传递下一个演示者,而不是下一个模型。我们所需要的只是在viewDidLoad()
中设置每个演示者的视图。为了防止保留循环,这将是一个弱属性
首先,这里是列表视图控制器。我做了一个UITableViewController
final class ListHotelViewController: UITableViewController {
private var presenter = ListHotelPresenter()
override func viewDidLoad() {
super.viewDidLoad()
presenter.setView(self)
presenter.loadHotelData()
}
}
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()
}
}
演示者将通过协议将其回调:
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)
}
}
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
}
}
以下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)
}
}
在每一步中,它都服从于演示者。演示者具有返回视图的弱链接,但仅通过协议。它不知道该视图是ListHotelViewController。对于基于终端的接口,我们应该能够用一堆print(41;
语句来实现视图
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)
}
}
在配置(单元格:行:)
中,演示者与给定单元格对话。请注意,该单元也是一个协议。有了MVP,我真的试着想象我将如何使用它来制作一个基于终端的界面。这是手机:
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
}
}
实际上,您应该向“表视图”单元格添加更多内容。在这个示例中,我只使用了一个普通单元格及其文本标签
最后,我们来看看推式视图控制器
final class ListHotelViewController: UITableViewController {
private var presenter = ListHotelPresenter()
override func viewDidLoad() {
super.viewDidLoad()
presenter.setView(self)
presenter.loadHotelData()
}
}
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()
}
}
我假设我们将立即显示我们拥有的摘要信息,但web服务中还有更多细节。这是由该演示者完成的
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
}
}
与往常一样,演示者通过协议告诉视图要做什么:
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)
}
}
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
}
}
如您所见,这些属性是私有的。为了支持单元测试,我们可能需要放宽使用
private(set)
的限制,以便只有setter是私有的。我不再使用Model-View-Controller
。我正在使用模型视图演示器
。因此,我的视图不应该知道模型。我不再使用Model-View-Controller
。我正在使用模型视图演示器
。所以我的观点不应该知道模型。