Swift 2.0 Method cannot be marked @objc because the type of the parameter cannot be represented in Objective-C
<p>After I have updated Swift 1 to Swift 2.0 I have an issue.</p>

<p>I am getting the following error on the first line of this code:</p>

<blockquote>
  <p>Method cannot be marked @objc because the type of the parameter cannot be represented in Objective-C</p>
</blockquote>

<pre><code>@objc func personsToFirstStep(persons: [Person]) {
    for person in persons {
        if !self.persons.contains(person) &amp;&amp; person.id != userID {
            self.persons.append(person)
        }
    }

    collectionView.reloadData()
    collectionViewPlaceholder.hidden = true
    collectionView.hidden = false
    collectionGradientView.hidden = false
} 
</code></pre>

<p>This this Person class: </p>

<pre><code>class Person: Hashable {

    var intID: Int = 0
    var id: String = ""
    var name: String = ""
    var type: String = ""

    var hashValue: Int {
        return self.intID
    }

    init(id: String, name: String, type: String) {
        self.id = id
        self.intID = Int(id)!
        self.name = name
        self.type = type
    }

}

func ==(lhs: Person, rhs: Person) -&gt; Bool {
    return lhs.intID == rhs.intID
}
</code></pre>