Preciso chamar o método de classe SearchScreen a partir de um cabeçalho React Navigation.

O Navegador fica assim:

  Search: {
    screen: SearchScreen,
    path: 'search/:query',
    navigationOptions: {
      title: 'Search',
      header: {
        right: (
          <MaterialCommunityIcons
            name="filter"
            onPress={() => {
              console.log(this);
            }}
            style={{marginRight: 15, color: 'white'}}
            size={24}
          />
        ),
      },
    }
  }