ios - Swift - 从也是 UIViewController 的通用基类继承 UIViewController

Question

所以我有一个基类，DataViewController<T> ，继承自 UITableViewController如下:

class DataTableViewController<T : BMPage<BMData>> : UITableViewController, UISearchBarDelegate {
    // implementations...
}

我还有一个TournamentsViewController它继承自 DataViewController传入泛型:

class TournamentsViewController: DataTableViewController<TournamentPage> {
    // overrides, etc.
}

供引用，这里是BMPage<T> :

open class BMPage<T : Codable> : Decodable {

    public enum CodingKeys: String, CodingKey {
        case data
    }

    var data : [T]

    required public init(from decoder:Decoder) throws {
        let vals = try decoder.container(keyedBy: CodingKeys.self)
        data = try vals.decode([T].self, forKey: .data)
    }
}

extension BMPage: Encodable {
    public func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)
        try container.encode(data, forKey: .data)
    }
}

...和BMData :

open class BMData : Codable {

    public enum CodingKeys: CodingKey {
        case id
        case name
    }

    var id: Int
    var name: String

    required public init(from decoder:Decoder) throws {
        let vals = try decoder.container(keyedBy: CodingKeys.self)
        id = try vals.decode(Int.self, forKey: .id)
        name = try vals.decode(String.self, forKey: .name)
    }
}

我想要实现的目标:各种UITableViewController只需指定泛型即可指定其特定数据的子类。这是我的 Tournament 和 TournamentPage 实现，它们应该更好地解释这个概念:

open class Tournament : BMData {
    let game_id: Int = 0
    let game_iteration_id: Int = 0
    let state: Int = 0
    let starts_at: String = ""
    let creator_id: Int = 0
    let stream_url: String? = nil
    let entrant_count: Int = 0
    let prereg_count: Int = 0
    let path: String = ""
}

open class TournamentPage : BMPage<BMData> {
    public enum CodingKeys: String, CodingKey {
        case data = "tournaments"
    }

    let page: String? = nil
    let results_per_page: String = ""
    let tournament_count: Int = 0
}

问题:编译器不喜欢我这样做，因为它会抛出多个但非常相似的错误，例如:

• Cannot convert return expression of type 'TournamentsViewController' to return type 'UIViewController'
• Cannot convert return expression of type 'TournamentsViewController?' to return type 'UIViewController?'

下面是此类表达式的一个示例(取自 XCode 放入的默认 ModelController，这是所有这些错误发生的地方:

    let dataViewController = storyboard.instantiateViewController(withIdentifier: "DataViewController") as! TournamentsViewController

有办法实现我想要做的事情吗？我承认，我是 Swift 新手(本周才开始学习)，所以也许我完全误解了典型的 Swift 实践以及它的设计目的，但可以用 C# 等语言来实现这一点(也可能甚至 Objective-C(虽然我对它有点生疏，因为自从我上次使用它以来已经有一段时间了)也是我在这里所做的。

Answer 1

您是否尝试过像这样实例化 View Controller ？
let viewController = MyTableViewController() 比navigationController.pushViewController(viewController, animated: true) }