Question

我在mvvm做。

我的代码如下： -

private var url = URL（字符串：＆＃34; http://www.example.com＆＃34;）！ typealias JSONDictionary = [String：Any]

 yum group install "My Group"

我的旅馆模型： -

class hostelmodel：NSObject {

class Webservice{

    static func fetchHostels(completion: @escaping ([JSONDictionary]) -> ()) {

        URLSession.shared.dataTask(with: url) { data, _, _ in

            if let data = data {

                let json = try! JSONSerialization.jsonObject(with: data, options: [])
                let dictionaries = json as! [JSONDictionary]
                completion(dictionaries)
            }

            }.resume()

}
}

}

我的hostelviewmodel： -

var name: String?
var city: String?

init(_ dictionary: [String: Any]) {
    if let name = dictionary["name"] as? String, let location = dictionary["location"] as? [String: Any], let city = location["city"] as? String {
        self.name = name
        self.city = city
    }
}

我的hostablecell： -

 class hostelviewmodel: NSObject {




  private var hostels: [hostelmodel] = []

    func fetchData(completion: (() -> Void)?) {
        Webservice.fetchHostels { [weak self] dictionaries in
            self?.hostels = dictionaries.flatMap(hostelmodel.init)
            completion?()
        }
    }

    func numberOfSections() -> Int {
        //your number of section
        return 1
    }

    func numberOfRows() -> Int {
        //your number of rows
        return hostels.count
    }

    func hostel(atIndex index: Int) -> hostelmodel {
        return hostels[index]
    }
}


my hostellist:-


    @IBOutlet private weak var tableView: UITableView!

    private var viewModel: hostelviewmodel

    init(hostelViewModel: hostelviewmodel) {
        self.viewModel = hostelViewModel
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }





    override func viewDidLoad() {
        super.viewDidLoad()
        fetchData()
    }


    private func fetchData() {
        viewModel.fetchData { [weak self] in
            DispatchQueue.main.async {
                self?.tableView.reloadData()
            }
        }
    func numberOfSections(in tableView: UITableView) -> Int {
        return viewModel.numberOfSections()
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return viewModel.numberOfRows()
    }

     func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

  let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)as! QM_RestaurtantCell

    cell.setRestaurtantData(restaurtant: QM_RestaurtantModel)

    return cell
    }




}
}

我没有故事板，所以在这里如何设置appdelegate。我应该在app delegate类中将其设置为根视图控制器。以及如何在swift中的行索引的tableview单元格中显示名称和城市值。如何去除

Answer 1

迁移到App Delegate到您的HostelList视图控制器：

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        // Transferring Control to First Controller

        window = UIWindow(frame: UIScreen.main.bounds)
        let nav1 = UINavigationController()
        let vc = HostelList()
        nav1.viewControllers = [vc]
        window?.rootViewController = vc
        window?.makeKeyAndVisible()        
        return true
    }

要在tableview中设置值，请使用此功能：

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
 }

Answer 2

确定。试试这个重构的代码： AppDelegate didFinish： func应用程序（_ application：UIApplication，

didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.

        let vm = HostelViewModel()

        let vc = HostelViewController(hostelViewModel: vm)

        window = UIWindow(frame: UIScreen.main.bounds)
        window?.rootViewController = vc
        window?.makeKeyAndVisible()

        return true
    }

<强> HostelViewController：

class HostelViewController: UIViewController {

    private let tableView = UITableView(frame: .zero, style: .plain)

    private var viewModel: HostelViewModel

    init(hostelViewModel: HostelViewModel) {
        self.viewModel = hostelViewModel
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }


    override func viewDidLoad() {
        super.viewDidLoad()
        createUI()

        tableView.dataSource = viewModel

        fetchData()
    }

    func createUI() {
        tableView.translatesAutoresizingMaskIntoConstraints = false

        self.view.addSubview(tableView)

        tableView.register(HostelCell.self, forCellReuseIdentifier: cellIdentifier)

        tableView.estimatedRowHeight = 60
        tableView.rowHeight = UITableViewAutomaticDimension


        let tableViewConstraints: [NSLayoutConstraint] = [
            tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
            tableView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
            tableView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
            tableView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor)
        ]


        NSLayoutConstraint.activate(tableViewConstraints)
    }

    private func fetchData() {
        viewModel.fetchData { [weak self] in
            DispatchQueue.main.async {
                self?.tableView.reloadData()
            }
        }

    }
}

<强> HostelViewModel：

class HostelViewModel: NSObject, UITableViewDataSource {

    private var hostels: [HostelModel] = []

    func fetchData(completion: (() -> Void)?) {
        Webservice.fetchHostels { [weak self] dictionaries in
            self?.hostels = dictionaries.flatMap(HostelModel.init)
            completion?()
        }
    }

    func hostel(atIndex index: Int) -> HostelModel {
        return hostels[index]
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return hostels.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let hostel = hostels[indexPath.row]

        let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as! HostelCell

        cell.setRestaurtantData(restaurtant: hostel)

        return cell

    }
}

HostelCell文件：

let cellIdentifier = "HostelTableCell"

class HostelCell: UITableViewCell {

    private var name: UILabel = UILabel()
    private var city: UILabel = UILabel()

    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)

        createUI()

    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }


    func setRestaurtantData(restaurtant: HostelModel)
    {
        self.name.text = restaurtant.name
        self.city.text = restaurtant.city

    }

    func createUI() {

        [city, name].forEach {
            contentView.addSubview($0)
            $0.translatesAutoresizingMaskIntoConstraints = true
        }

        city.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 8).isActive = true
        city.centerYAnchor.constraint(equalTo: contentView.centerYAnchor).isActive = true

        name.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -8).isActive = true
        name.centerYAnchor.constraint(equalTo: contentView.centerYAnchor).isActive = true

    }

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }

}

<强> HostelModel：

class HostelModel {

    var name: String?
    var city: String?

    init(_ dictionary: [String: Any]) {
        if let name = dictionary["name"] as? String, let location = dictionary["location"] as? [String: Any], let city = location["city"] as? String {
            self.name = name
            self.city = city
        }
    }
}

应用程序中的viewmodel委托离线mmvm在swift中

2 个答案: