如何在从API获取数据之前停止组件渲染。为了进行异步API调用，我使用了react redux-saga

// 组件
import React, { Component } from 'react';
import { connect } from 'react-redux';
import { fetchData } from './actions';

class MyComponent extends Component {
  componentDidMount() {
    this.props.fetchData();
  }

  render() {
    const { data, isLoading } = this.props;

    if (isLoading) {
      return <div>Loading...</div>;
    }

    return (
      <div>
        {/* 渲染组件内容 */}
      </div>
    );
  }
}

const mapStateToProps = state => ({
  data: state.data,
  isLoading: state.isLoading
});

const mapDispatchToProps = {
  fetchData
};

export default connect(mapStateToProps, mapDispatchToProps)(MyComponent);

// Redux-Saga
import { takeLatest, call, put } from 'redux-saga/effects';
import { fetchDataSuccess, fetchDataFailure } from './actions';
import { apiCall } from './api';

function* fetchDataSaga() {
  try {
    const response = yield call(apiCall);
    yield put(fetchDataSuccess(response.data));
  } catch (error) {
    yield put(fetchDataFailure(error.message));
  }
}

export function* watchFetchData() {
  yield takeLatest('FETCH_DATA', fetchDataSaga);
}

// Redux actions
export const fetchData = () => ({
  type: 'FETCH_DATA'
});

export const fetchDataSuccess = data => ({
  type: 'FETCH_DATA_SUCCESS',
  payload: data
});

export const fetchDataFailure = error => ({
  type: 'FETCH_DATA_FAILURE',
  payload: error
});

// Redux reducer
const initialState = {
  data: null,
  isLoading: false,
  error: null
};

const reducer = (state = initialState, action) => {
  switch (action.type) {
    case 'FETCH_DATA':
      return {
        ...state,
        isLoading: true,
        error: null
      };
    case 'FETCH_DATA_SUCCESS':
      return {
        ...state,
        data: action.payload,
        isLoading: false
      };
    case 'FETCH_DATA_FAILURE':
      return {
        ...state,
        error: action.payload,
        isLoading: false
      };
    default:
      return state;
  }
};

export default reducer;