U3 Artículo1 SE7

pickButton() {
    if (this.state.section === 'todoList') {
      return (
        <Button
          onPress={() => { this.changeStateSection('addTodo'); }}
          title="Add Todo"
        />
      );
    }

    return (
      <Button
        onPress={() => { this.changeStateSection('todoList'); }}
        title="Cancel"
      />
    );
  }