use this in static

use-this-in-static-reac-navigation.md

  static navigationOptions ({ navigation }) {
    const { category } = navigation.state.params
    if (!category.parentId) {
      return {
        title: category.name,
        headerRight: (
          <TouchableOpacity onPress={() => navigation.state.params.handleCreate()} style={{ marginRight: 20 }}>
            <Ionicons name='ios-add-circle-outline' size={30} color='#fff' />
          </TouchableOpacity>
        ),
        headerTintColor: 'white'
      }
    } else {
      return {
        title: category.name,
        headerTintColor: 'white'
      }
    }
  };

  saveDetails () {
    return this.refs.modalCate.show()
  }
  componentDidMount () {
    this.props.navigation.setParams({
      handleCreate: this.saveDetails.bind(this)
    })
}