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headerRight: (
        <TouchableOpacity
          style={{ marginRight: 30 }}
          onPress={() =>
            Alert.alert("Logout alert", "Do you really want to Logout...", [
              {
                text: "NO",
                onPress: () => console.warn("NO Pressed"),
                style: "cancel"
              },

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  defaultNavigationOptions: ({ navigation }) => ({
      headerStyle: {
        backgroundColor: colors.green01,
        elevation: 0,
        shadowOpacity: 0
      },
      headerLeft: (
        <TouchableOpacity
          style={{ marginLeft: 20 }}
          onPress={() => navigation.openDrawer()}

krissnawat

export default createAppContainer(DrawerNavigator);

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const DrawerNavigator = createDrawerNavigator({
  AppNavigator: {
    screen: AppNavigator,
    navigationOptions: {
      drawerLabel: "Home"
    }
  }
});

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import {
  createStackNavigator,
  createDrawerNavigator,
  createAppContainer,
} from "react-navigation";

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{
   initialRouteName: "Home",
   headerMode: "none"
}

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  componentDidMount() {
    firebase.auth().onAuthStateChanged(user => {
      if (user) {
      } else {
        alert("Your have not logged in");
        this.props.navigation.navigate("LoggedOut");
      }
    });
  }

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      <RoundedButton
            text="Connect to Facebook"
            textColor={colors.green01}
            backgroundColor={colors.white}
            icon={
              <Icon name="facebook" size={20} style={styles.facebookIcon} />
            }
            onPress={() => this.FacebookLogin()}
      />

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async FacebookLogin() {
    const result = await LoginManager.logInWithPermissions([
      "public_profile",
      "email"
    ]);

    if (result.isCancelled) {
      throw new Error("User cancelled the login process");
    }
    const data = await AccessToken.getCurrentAccessToken();

krissnawat

- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
            options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options {

  BOOL handled =  [[FBSDKApplicationDelegate sharedInstance] application:application openURL:url options:options]
  ];
  // Add any custom logic here.
  return handled;
}