Example of requiring object to have or be an object of a certain class and conform to a protocol.

UIViewProtocolExample.swift

import UIKit

class MyView: UIView {}

protocol MyProtocol {
    var view: UIView { get }
    func myFunc()
}

extension MyProtocol {
    func myFunc() {
        print(self.dynamicType)
    }
}

extension UIView {
    var view: UIView { return self }
}

extension MyView: MyProtocol {}

let myView: MyProtocol = MyView()
//myView.frame
myView.view.frame = .zero

Note that if you wanted MyProtocol conformance to apply to things that weren't views you could add an additional protocol that extends it and adds the view property but that isn't shown in this example.