Checking if a Swift class conforms to a protocol and implements an optional function?

Question

I\'m writing a helper function in Swift for use in SpriteKit games that will check if the collision detention has been set up correctly.

I want to check that my GameScen

Answer 1

respondsToSelector fails, because it expects an instance of SKPhysicsContact and not SKPhysicsContact.type.

To check if an object implements an interface, you can use is. So for example:

protocol Test {
    func foo();
}

class TestImpl : Test {
    func foo() {
        print("bar")
    }
}

let a = TestImpl()
let b = String()
print(a is Test) // true
print(b is Test) // false