using a button to display web view

    import UIKit
import WebKit

class ViewController: UIViewController, WKUIDelegate, UITextFieldDelegate {
    @IBOutlet var error: UILabel!
    @IBOutlet var textoutlet: UITextField!
    @IBAction func getweather(_ sender: Any) {
        if introducirtex.text == ""
        {
            error.text = "try again"
        }
        else
        {
            error.text = "correct"
           **dont know what to put here**
        }
    }

    @IBOutlet var webdisplay: WKWebView!





    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

    }

    override func viewDidAppear(_ animated: Bool) {

        super .viewDidAppear(animated)

        let url = URL(string: "https://www.google.com.mx/search?ei=wbZ4WtKGKsKE0wLLg4bQAg&q=" + textoutlet.text! + "+clima&oq=orizaba+clima&gs_l=psy-ab.3..35i39k1l2j0l8.58322.60729.0.60880.14.9.0.0.0.0.356.1191.2-2j2.4.0....0...1c.1.64.psy-ab..10.4.1190...0i20i263k1.0.ZfKggraKRyY")!
        let urlrequest:URLRequest = URLRequest(url: url)
        webdisplay.load(urlrequest)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.view.endEditing(true)
    }
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }


}

i want to click my getweather button when the user introduce in the textoutlet.text the city to get weather but i have no idea how to do it, i try to put the code on the else sentence and didnt work i dont know what to do im new plz help