Open WhatsApp in iOS

in info.plist file add this line

<key>LSApplicationQueriesSchemes</key>

<array>

       <string>whatsapp://</string>

</array>

if let whatappURL = URL(string: "https://api.whatsapp.com/send?phone=\(number)&text=\(msg)"),

  UIApplication.shared.canOpenURL(whatappURL)

{

  if #available(iOS 10.0, *) {

    UIApplication.shared.open(whatappURL, options: [:], completionHandler: nil)

  } else {

    UIApplication.shared.openURL(whatappURL)

  }

}