title: UIWebView init giving crash
body: <p>I am adding UIWebView in a custom view :  </p>
  
  <pre><code>self.webViewContent = UIWebView(frame: CGRect(x: 10, y: 110, width: self.frame.size.width - 20, height: self.frame.size.height - 170))
  self.webViewContent.scrollView.isScrollEnabled = true
  self.webViewContent.scrollView.bounces = false
  self.webViewContent.loadHTMLString(String(format: "&lt;HTML&gt;&lt;body style='font-family:OpenSans;'&gt;&lt;font size='4'&gt;%@&lt;/font&gt;&lt;/body&gt;&lt;/HTML&gt;", self.subtab.Content), baseURL: nil)
  self.addSubview(self.webViewContent)  
  </code></pre>
  
  <p>This gives me a crash on very first line. No console message displayed.  </p>
  
  <p>I am declaring web view as follows :  </p>
  
  <pre><code>var webViewContent: UIWebView!
  </code></pre>