React Navigation; use image in header?

According to the official docs of react-navigation v5, it can be implemented as follows:

https://reactnavigation.org/docs/headers/#replacing-the-title-with-a-custom-component

<Stack.Navigator>
  <Stack.Screen
    name="Home"
    component={HomeScreen}
    // title: 'App Name'
    options={{ 
     headerTitle: (props) => ( // App Logo
      <Image
        style={{ width: 200, height: 50 }}
        source={require('../assets/images/app-logo-1.png')}
        resizeMode='contain'
      />
    ),
    headerTitleStyle: { flex: 1, textAlign: 'center' },
    }}
  />
</Stack.Navigator>

Update for React Navigation v5! (making this post for future references)

For react navigation 5, I found this solution.

In StackNavigator.js class you can set a different image for each page (Stack.Screen):

<Stack.Screen 
    name='Home' 
    component={HomeScreen} 
    options={{ 
      title: <Image style={{ width: 250, height: 50 }}
      source = require('../images/yourimage.png')}/> 
    }}
 />

Then, you must adjust width, height, and position of the image, but it works! I think it's the simpliest way. Here's the output (yes, it's my image, before adjustments).

Don't forget to import Image!

import { Image } from 'react-native'

Update:

Since v2 of the library there's an special option for setting the header background, namely headerBackground.

This option accepts a React component, so when set to an Image component, it will use that.

For example:

export default createStackNavigator({
  Home: {
    screen: HomeScreen
  },
}, {
  navigationOptions: {
    headerBackground: () => (
      <Image
        style={StyleSheet.absoluteFill}
        source={{ uri: 'https://upload.wikimedia.org/wikipedia/commons/3/36/Hopetoun_falls.jpg' }}
      />
    ),
  }
});

Working example: https://snack.expo.io/@koen/react-navigation-header-background

---

Old answer, for when still using React Navigation v1:

Creating a custom header with an image is actually really simple.

By wrapping the Header with a view and placing an absolute positioned image in that view, the image will scale to its parent size.

Important is to set the backgroundColor of the default header to transparent.

const ImageHeader = props => (
  <View style={{ backgroundColor: '#eee' }}>
    <Image
      style={StyleSheet.absoluteFill}
      source={{ uri: 'https://upload.wikimedia.org/wikipedia/commons/3/36/Hopetoun_falls.jpg' }}
    />
    <Header {...props} style={{ backgroundColor: 'transparent' }}/>
  </View>
);

And then use that component as header:

const SimpleStack = StackNavigator({
  Home: {
    screen: MyHomeScreen,
  },
}, {
  navigationOptions: {
    headerTitleStyle: { color: '#fff' },
    header: (props) => <ImageHeader {...props} />,
  }
});

Which would result in: