title: UIWebView loading progress and adjust web page to fit the view page?
body: <p>I am using UIWebView to load a web page.</p>
  
  <p>There are 3 questions:</p>
  
  <p>1.It it possible to track the percentage progress when UIWebView is loading the page?</p>
  
  <p>2.I noticed that when Safari loading a web page, the URL textfield displays a blue background progress indicator to tell user the percentage of loading a web page. What is the technology for this? </p>
  
  <p>3.I know there is property scalesPageToFit  </p>
  
  <p>scalesPageToFit
  A Boolean value determining whether the webpage scales to fit the view and the user can change the scale.</p>
  
  <p>I try to set it to YES, but it looks like that it is not in public API and my app stopped with black screen, I am not sure what is wrong?</p>