Swift class doesn't conform to objective c protocol inherited from swift protocol

Question

I am having an issue checking for objective-c protocol conformance when it is inherited from a swift protocol. As far as I understand the following code should print true. (Swift 3)

import UIKit

protocol MyProtocol: UITableViewDelegate {}

class MyClass: UIViewController, MyProtocol {}

let myClass = MyClass()

print(myClass.conforms(to: UITableViewDelegate.self))
// prints false 

let viewController = myClass as UIViewController
print(viewController as? UITableViewDelegate ?? "not a delegate")
// prints not a delegate

If anyone knows why this is happening or how to properly check this conformance that'd be great

Ashton-W · Accepted Answer · 2017-09-28 01:43:37Z

2

In Swift 3, adding @objc to my MyProtocol works.

answered Sep 28, 2017 at 1:43

Ashton-W

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1 Comment

Adam Campbell Over a year ago

Awesome thanks, it appears this is a swift 3.1 Xcode 8.3.X issue

Yun CHEN · Accepted Answer · 2017-09-28 01:38:52Z

1

Why it's true for me(tested with Swift 3.2 and 4.0), did we really do the same thing:

edited Sep 28, 2017 at 1:38

answered Sep 28, 2017 at 1:33

Yun CHEN

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2 Comments

Adam Campbell Over a year ago

Yep I was doing the same thing, you are right this is fixed for 3.2 & 4. I was using swift 3.1

Yun CHEN Over a year ago

So that. Thanks for figuring it out!

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