Can you try this NSString *script = @"var videos = document.querySelectorAll("video"); for (var i = videos.length - 1; i >= 0; i--) { videos[i].pause(); };"; [webView stringByEvaluatingJavaScriptFromString:script];

Check target deployment target, check kind, family in Scheme -> Arguments In somecases it may not launch, just add from gallery.