Find out the name of all the implementers of swift protocol

Question

Is it possible to get the name of all the implementers of a swift protocol..? and if it is then how..?

I am trying to write and SDK which exposes a protocol which has all the static methods, I do not want to implement delegate pattern here as I want to get the name of all the implementers and call the methods directly.

whats the whole point of having protocols if you dont have delegates (weak reference to class which implements your protocol) ? How do you plan to get all objects in memory? and call method manually — Sandeep Bhandari, Jul 28 '18 at 17:02
Thank you for replying guys, I do understand that this would be horrible design to go with bit i am doing some sort of experiment and i was wondering if it is possible and how. So I found one old similar question : https://stackoverflow.com/questions/34415028/how-to-list-all-classes-conforming-to-protocol-in-swift Which kinda works. Thank you — Nilesh, Aug 14 '18 at 08:21

score 1 · Accepted Answer · answered Aug 25 '18 at 13:24

so this is how I did it:

static func getClassesImplementingProtocol(_ protocolName: Protocol!) -> [AnyClass] {

    var result = [AnyClass]();

    let count: Int32 = objc_getClassList(nil, 0)

    guard count > 0 else {
        return result
    }

    let classes = UnsafeMutablePointer<AnyClass>.allocate(
        capacity: Int(count)
    )

    defer {
        classes.deallocate()
    }

    let buffer = AutoreleasingUnsafeMutablePointer<AnyClass>(classes)

    for i in 0..<Int(objc_getClassList(buffer, count)) {
        let someclass: AnyClass = classes[i]

        if class_conformsToProtocol(someclass, protocolName) {

            result.append(someclass);
        }
    }

    return result
}

Thanks to : How to list all classes conforming to protocol in Swift?

Find out the name of all the implementers of swift protocol

1 Answers1