IPhone : How to call a UIViewController inside a UIButton in swift NSCoder

I don't know how call a UIViewController inside a UIButton.

I have this ViewController:

import UIKit

class ExampleViewController: UIViewController {

private var activity: UIActivityIndicatorView
private var label: UILabel

required init(coder aDecoder: NSCoder) {
    label = UILabel()
    activity = UIActivityIndicatorView()
    super.init(coder: aDecoder)
}

override func viewDidLoad() {
    super.viewDidLoad()

.....

And in another file the calling like this:

@IBAction func myButton(sender: UIButton) {

    var pointer = ExampleViewController(coder: NSCoder)


}

I don't know what I should write in NSCoder in this case. If I write ExampleViewController(), Xcode shows an error "Missing argument for parameter coder in call". I suppose I don't understand something but I don't have a lot of experience so I will appreciate some information about that. Thanks in advance!!!