protocol Configureable: class {
    var planType: Plantype { get set }
    var counterType: CounterType { get set }
}

extension Configureable where Self: Test2ViewController {...//RETURN PLANTYPE}
extension Configureable where Self: TestViewController {...//RETURN COUNTERTYPE}

@objc protocol CounterDataSource {
    @objc optional func increment(forCount count: Int) -> Int
    @objc optional var fixedIncrement: Int { get }
}