Ionic App redirect to the external application

Ionic Framework ionic-v3
#1

Here the my code redirects to the Viber application, it’s not working anyone can help me to solve this problem?

my code
let prefix = this.gApp.platformIs(‘ios’) ? ‘com.apple.social.’ : ‘’;

        this.socialSharing.shareVia(
          prefix +'viber://',
          this.property.heading,
          null,
          this.property.heading,
          this.property.link,
        )

I tried
prefix +‘viber://’,
prefix +‘viber’,
viber
as a app name.
but its not working in ios application.