title: WKWebView LayoutConstraints issue
body: <p>I have created a simple webview app.  But there is a small problem and I can not fix it. It loads the first page without issue. </p>
  
  <p><a href="https://i.stack.imgur.com/qKmrY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qKmrY.png" alt="enter image description here"></a></p>
  
  <p><br/></p>
  
  <p>When I click to the first input, the program crashes and the error code is below:</p>
  
  <pre>
  2017-10-28 23:50:54.289690+0400 BFI Schools[68425:3885613] [LayoutConstraints] Unable to simultaneously satisfy constraints.
  Probably at least one of the constraints in the following list is one you don't want. 
  Try this: 
      (1) look at each constraint and try to figure out which you don't expect; 
      (2) find the code that added the unwanted constraint or constraints and fix it. 
  (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
  </pre>
  
  <p>My code is below:</p>
  
  <pre><code>//
  //  ViewController.swift
  //  BFI Schools
  //
  //  Created by Kamandar Abdullayev on 10/28/17.
  //  Copyright © 2017 ROOM404.AZ. All rights reserved.
  //
  
  import UIKit
  import WebKit
  
  class ViewController: UIViewController , UIWebViewDelegate {
      @IBOutlet weak var webView: UIWebView!
      @IBOutlet weak var spinner: UIActivityIndicatorView!
  
      override func viewDidLoad() {
          super.viewDidLoad()
  
          view.translatesAutoresizingMaskIntoConstraints=false
  
          let url = URL(string: "https://www.parent.e-hism.co")!
          let request = URLRequest(url: url)
  
          if Reachability.isConnectedToNetwork() == true {
              webView.loadRequest(request)
          } else {
              let alert = UIAlertView(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", delegate: nil, cancelButtonTitle: "OK")
              alert.show()
          }
      }
  
      func webViewDidStartLoad(_ : UIWebView) {
          spinner.startAnimating()
      }
  
      func webViewDidFinishLoad(_ : UIWebView) {
          spinner.stopAnimating()
      }
  }
  </code></pre>
  
  <p>I have tried all help that I find on the Internet, but no luck.  </p>