Javascript console.log() in an iOS UIWebView

Question

When writing a iPhone / iPad app with a UIWebView, the console isn\'t visible. this excellent answer shows how to trap errors, but I would like to use the console.log() as w

Answer 1

Here's the Swift solution: (It's a bit of a hack to get the context)

1. You create the UIWebView.

2. Get the internal context and override the console.log() javascript function.

   self.webView = UIWebView()
   self.webView.delegate = self
   
   let context = self.webView.valueForKeyPath("documentView.webView.mainFrame.javaScriptContext") as! JSContext
   
   let logFunction : @convention(block) (String) -> Void =
   {
       (msg: String) in
   
       NSLog("Console: %@", msg)
   }
   context.objectForKeyedSubscript("console").setObject(unsafeBitCast(logFunction, AnyObject.self), 
                                                        forKeyedSubscript: "log")