title: scale down pdf to fit in iframe in uiwebview
body: <p>I have a uiwebview that loads a iframe to display a pdf file.
  But only the top left corner of the pdf file i visible, I need to fit the pdf file inside then iframe, that is, I need to scale down the pdf file so that all of it is visible.
  I know that with webpages you can open a pdf and set the starting scale on it like this page1.pdf#zoom=25 but that doesnt work in the webview. Does anybody know what to do?</p>