MVVMを2パターン考えてみる（追記：MVPでしたすみません） ref: https://qiita.com/hmhmsh/items/263f1f531c220eb781ee

Entity.swift

struct Entity {
    let name: String
    let age: Int
}

Model.swift

struct Model {
    let name: String
    let age: Int
}

MVVMViewController.swift

extension MVVMViewController: UITableViewDelegate, UITableViewDataSource {

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

    public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: "MVVMCell", for: indexPath)
        cell.textLabel?.text = viewModel.getName(index: indexPath.row)
        return cell
    }

}

Repository.swift

protocol RepositoryToViewModel: class {
    func onGetModels(models: [Model])
}

class Repository {
    weak var viewModel: RepositoryToViewModel?

    func getModels() {
        // 通信などで取得する
        // 今回は仮で作成
        var models = [Model]()
        models.append(Model(name: "tarou", age: 25))
        models.append(Model(name: "zirou", age: 20))
        models.append(Model(name: "saburou", age: 18))
        viewModel?.onGetModels(models: models)
    }
}

ViewModel.swift

class ViewModel {
    private var models: [Model] = [] {
        didSet {
            view?.onChangeModels()
        }
    }

    /* 省略 */    

    func getModelCount() -> Int {
        return models.count
    }

    func getName(index: Int) -> String {
        return models[index].name
    }
}