Issue resolved by manually merging simulator and device header files.https://developer.apple.com/documentation/xcode_release_notes/xcode_10_2_release_notes?language=objc
jeffAyan
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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.