LoginScreen.tsx

// ... imports
import LoginForm from "../../components/LoginForm";
import { KeyboardAvoidingView, Platform } from "react-native";
import { NavigationScreenProp } from "react-navigation";

interface Props {
  navigation: NavigationScreenProp<any, any>
}

export default class LoginScreen extends Component<Props, object> {
  // ... navigationOptions

  render() {
    return (
      <KeyboardAvoidingView
        style={styles.container}
        behavior={Platform.OS === "ios" ? "padding" : undefined}
      >
        <LoginForm navigation={this.props.navigation} />
      </KeyboardAvoidingView>
    );
  }
}