Returning the subclass in a UIViewController static

Question

Consider a base UIViewController class...

class Rooms: UIViewController {
    class func instantiate()->Rooms {
    }

    static func make()->Rooms {
         


        

Answer 1

You can do something like this.

class RoomBase: RoomProtocol {
    // things common to every room go here
    required init() {}
}

You can put in RoomBase all the stuff you want the other rooms to inherit.

Next you put the make() method into a protocol extension.

protocol RoomProtocol: class {
    init()
}

extension RoomProtocol where Self: RoomBase {
    static func make() -> Self {
        let room = Self()
        // set up
        return room
    }
}

Now you can write

class Dining: RoomBase {}
class Bath: RoomBase { }

And this code will work

let dining: Dining = Dining.make()
let bath: Bath = Bath.make()