Cannot disable SignUp or Greetings in Authenticator Component.

Describe the bug I am using an Authenticator Component in aws-amplify-react-native but cannot disable the SignUp component using the usual methods. It shows up every time.

To Reproduce Steps to reproduce the behavior:

class AuthScreen extends React.Component {
  render() {
    return (
      <View style={Style.container}>
        <View style={Style.logoContainer}>
          <Image style={Style.logo} source={Images.logo} resizeMode={'contain'} />
        </View>
        <Authenticator hide={[Greetings, SignUp]} theme={rprTheme} />
      </View>
    )
  }
}

Expected behavior Expecting to have the SignUp component hidden.

Screenshots It just shows up as you would expect the standard component to show up with all of the usual components.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

[tripplilley]

As a workaround, you can use the hideDefault property on the Authenticator, then explicitly list your contained components. Note that you may have to add an onStateChange handler to skip past states you’ve hidden (e.g., verifyContact) or you’ll end up with a blank UI when you hit that state.

<Authenticator hideDefault={true}>
  <SignIn>
  <SignOut>
  <Greetings>
</Authenticator>

[Milan-Shah]

We have added new hide sign up prop #1260. Please let us know if you have any questions.