在 AgGridReact 的 onGridReady 回调函数中，将 gridApi.sizeColumnsToFit() 方法的调用移至 setTimeout 函数中，以便等待组件渲染完成后再执行自适应列宽度的操作。

示例代码：

import React, { Component } from 'react';
import { AgGridReact } from 'ag-grid-react';
import 'ag-grid-community/dist/styles/ag-grid.css';
import 'ag-grid-community/dist/styles/ag-theme-balham.css';

class App extends Component {
  constructor(props) {
    super(props);

    this.state = {
      columnDefs: [{
        headerName: "Make", field: "make"
      }, {
        headerName: "Model", field: "model"
      }, {
        headerName: "Price", field: "price"
      }],
      rowData: [{
        make: "Toyota", model: "Celica", price: 35000
      }, {
        make: "Ford", model: "Mondeo", price: 32000
      }, {
        make: "Porsche", model: "Boxter", price: 72000
      }]
    };
  }

  onGridReady = (params) => {
    this.gridApi = params.api;
    setTimeout(() => {
      this.gridApi.sizeColumnsToFit();
    }, 0);
  }

  render() {
    return (
      

        
      
    );
  }
}

export default App;