[URGENT] iOS create javascript redirect from APP Webview to the browser

Scenario- 1) My webpage is opened in an iOS APP webview (I know the user agent of the APP). 2) I don't own the app, so can't make change to the app code 3) I need a javascript solution (client side) to redirect my page from within the webview to open in external system browser (say safari). Example - the above scenario is possible on Android where one can use "intent" to open the page out of webview and into the browser. Will be only a couple of lines of code for an expert. Freelancer that can show a working demo will be preferred. Quick Money!