Configuring the header bar

By now you're probably tired of seeing a blank grey bar on the top of your screen — you're ready for some flair. So let's jump in to configuring the header bar.

Setting the header title

A screen component can have a static property called navigationOptions which is either an object or a function that returns an object that contains various configuration options. The one we use for the header title is title, as demonstrated in the following example.

class HomeScreen extends React.Component {
  static navigationOptions = {
    title: 'Home',
  };

  /* render function, etc */
}

class DetailsScreen extends React.Component {
  static navigationOptions = {
    title: 'Details',
  };

  /* render function, etc */
}

→ Run this code

StackNavigator uses platform conventions by default, so on iOS the title will be centered and on Android it will be left-aligned.

Using params in the title

In order to use params in the title, we need to make navigationOptions a function that returns a configuration object. It might be tempting to try to use this.props inside of navigationOptions, but because it is a static property of the component, this does not refer to an instance of the component and therefore no props are available. Instead, if we make navigationOptions a function then React Navigation will call it with an object containing { navigation, navigationOptions, screenProps } -- in this case, all we care about is navigation, which is the same object that is passed to your screen props as this.props.navigation. You may recall that we can get the params from navigation through navigation.state.params, and so we do this below to extract a param and use it as a title.

class DetailsScreen extends React.Component {
  static navigationOptions = ({ navigation }) => {
    const { params } = navigation.state;

    return {
      title: params ? params.otherParam : 'A Nested Details Screen',
    }
  };

  /* render function, etc */
}

→ Run this code

The argument that is passed in to the navigationOptions function is an object with the following properties:

• navigation - The navigation prop for the screen, with the screen's route at navigation.state.
• screenProps - The props passing from above the navigator component
• navigationOptions - The default or previous options that would be used if new values are not provided

We only needed the navigation prop in the above example but you may in some cases want to use screenProps or navigationOptions.

Updating navigationOptions with setParams

It's often necessary to update the navigationOptions configuration for the active screen from the mounted screen component itself. We can do this using this.props.navigation.setParams

/* Inside of render() */
  <Button
    title="Update the title"
    onPress={() => this.props.navigation.setParams({otherParam: 'Updated!'})}
  />

→ Run this code

Adjusting header styles

There are three key properties to use when customizing the style of your header: headerStyle, headerTintColor, and headerTitleStyle.

• headerStyle: a style object that will be applied to the View that wraps the header. If you set backgroundColor on it, that will be the color of your header.
• headerTintColor: the back button and title both use this property as their color. In the example below, we set the tint color to white (#fff) so the back button and the header title would be white.
• headerTitleStyle: if we want to customize the fontFamily, fontWeight and other Text style properties for the title, we can use this to do it.

class HomeScreen extends React.Component {
  static navigationOptions = {
    title: 'Home',
    headerStyle: {
      backgroundColor: '#f4511e',
    },
    headerTintColor: '#fff',
    headerTitleStyle: {
      fontWeight: 'bold',
    },
  };

  /* render function, etc */
}

→ Run this code

There are a couple of things to notice here: 1. On iOS the status bar text and icons are black, and this doesn't look great over a dark colored background. We won't discuss it here, but you should be sure to configure the status bar to fit with your screen colors as described in the status bar guide. 2. The configuration we set only applies to the home screen; when we navigate to the details screen, the default styles are back. We'll look at how to share navigationOptions between screens now.

Sharing common navigationOptions across screens

It is common to want to configure the header in a similar way across many screens. For example, your company brand color might be red and so you want the header background color to be red and tint color to be white. Conveniently, these are the colors we're using our running example, and you'll notice that when you navigate to the DetailsScreen the colors go back to the defaults. Wouldn't it be awful if we had to copy the navigationOptions header style properties from HomeScreen to DetailsScreen, and for every single screen component we use in our app? Thankfully, we do not. We can instead move the configuration up to the StackNavigator.

class HomeScreen extends React.Component {
  static navigationOptions = {
    title: 'Home',
    /* No more header config here! */
  };

  /* render function, etc */
}

/* other code... */

const RootStack = StackNavigator(
  {
    Home: {
      screen: HomeScreen,
    },
    Details: {
      screen: DetailsScreen,
    },
  },
  {
    initialRouteName: 'Home',
    /* The header config from HomeScreen is now here */
    navigationOptions: {
      headerStyle: {
        backgroundColor: '#f4511e',
      },
      headerTintColor: '#fff',
      headerTitleStyle: {
        fontWeight: 'bold',
      },
    },
  }
);

→ Run this code

Now, any screen that belongs to the RootStack will have our wonderful branded styles. Surely though, there must be a way to override these options if we need to?

Overriding shared navigationOptions

The navigationOptions specified on your screen component are merged together with those of its parent StackNavigator, with the options on the screen component taking precedence. Let's use this knowledge to invert the background and tint colors on the details screen.

class DetailsScreen extends React.Component {
  static navigationOptions = ({ navigation, navigationOptions }) => {
    const { params } = navigation.state;

    return {
      title: params ? params.otherParam : 'A Nested Details Screen',
      /* These values are used instead of the shared configuration! */
      headerStyle: {
        backgroundColor: navigationOptions.headerTintColor,
      },
      headerTintColor: navigationOptions.headerStyle.backgroundColor,
    };
  };

  /* render function, etc */
}

→ Run this code

Replacing the title with a custom component

Sometimes you need more control than just changing the text and styles of your title -- for example, you may want to render an image in place of the title, or make the title into a button. In these cases you can completely override the component used for the title and provide your own.

class LogoTitle extends React.Component {
  render() {
    return (
      <Image
        source={require('./spiro.png')}
        style={{ width: 30, height: 30 }}
      />
    );
  }
}

class HomeScreen extends React.Component {
  static navigationOptions = {
    // headerTitle instead of title
    headerTitle: <LogoTitle />,
  };

  /* render function, etc */
}

→ Run this code

You might be wondering, why headerTitle when we provide a component and not title, like before? The reason is that headerTitle is a property that is specific to a StackNavigator, the headerTitle defaults to a Text component that displays the title.

Additional configuration

You can read the full list of available screen navigationOptions for screens inside of StackNavigator in the StackNavigator reference.

Summary

• You can customize the header inside of the navigationOptions static property on your screen components. Read the full list of options in the API reference.
• The navigationOptions static property can be an object or a function. When it is a function, it is provided with an object with the navigation prop, screenProps, and navigationOptions on it.
• You can also specify shared navigationOptions in the StackNavigator configuration when you initialize it. The static property takes precedence over that configuration.
• Full source of what we have built so far.