'openURL' was deprecated in iOS 10.0: Please use openURL:options:completionHandler: instead in Swift 3

Use like

 //inside scope use this
 let myUrl = "http://www.google.com"
    if let url = URL(string: "\(myUrl)"), !url.absoluteString.isEmpty {
        UIApplication.shared.open(url, options: [:], completionHandler: nil)
    }

    // or outside scope use this
    guard let url = URL(string: "\(myUrl)"), !url.absoluteString.isEmpty else {
       return
    }
     UIApplication.shared.open(url, options: [:], completionHandler: nil)

For more reference see this sample link.

Try to use this:

UIApplication.shared.open(URL(string: "\(myUrl)")!)